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CVE-2020-25596

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of...

5.5 MediumFix available

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.51%Down 1.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.5

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
CVE-2020-25596
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
2.1 LowAV:L/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-74
Updated
2026-11-02
CVE List No score

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
CVE-2020-25596
Updated
2026-11-02
EUVDEUVD-2020-18275 No score

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
EUVD-2020-18275
Updated
2026-11-03
GitHub AdvisoriesGHSA-wv5g-6p8m-2pxx 5.5

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of...

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
GHSA-wv5g-6p8m-2pxx
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-74
Updated
2026-11-02
OSVALPINE-CVE-2020-25596 5.5

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
ALPINE-CVE-2020-25596
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 5.5

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
CVE-2020-25596
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 13 moreShow less
OSVDEBIAN-CVE-2020-25596 5.5

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
DEBIAN-CVE-2020-25596
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-25596 5.5

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

Record
UBUNTU-CVE-2020-25596
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2020:1608-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)
  • CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)
  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • Various other fixes (bsc#1027519)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Record
openSUSE-SU-2020:1608-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11520-1 No score

xen-4.15.1_01-1.2 on GA media

These are all security issues fixed in the xen-4.15.1_01-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11520-1
Updated
2026-11-02
OSVSUSE-SU-2020:14521-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-0543: Fixed a leak of Special Register Buffer Data Sampling (SRBDS) aka 'CrossTalk' (bsc#1172205,XSA-320)
  • CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).
  • CVE-2020-15565: Fixed an issue cache write (bsc#1173378,XSA-321).
  • CVE-2020-15567: Fixed an issue with non-atomic modification of live EPT PTE (bsc#1173380,XSA-328)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
Record
SUSE-SU-2020:14521-1
Updated
2026-11-02
OSVSUSE-SU-2020:2786-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)
  • CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)
  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).
  • Various bug fixes (bsc#1027519)
Record
SUSE-SU-2020:2786-1
Updated
2026-11-02
OSVSUSE-SU-2020:2787-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).
  • Various bug fixes (bsc#1027519)
Record
SUSE-SU-2020:2787-1
Updated
2026-11-02
OSVSUSE-SU-2020:2788-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)
  • CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)
  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).
  • Various bug fixes (bsc#1027519)
Record
SUSE-SU-2020:2788-1
Updated
2026-11-02
OSVSUSE-SU-2020:2789-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
Record
SUSE-SU-2020:2789-1
Updated
2026-11-02
OSVSUSE-SU-2020:2790-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)

  • CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)

  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)

  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)

  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)

  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)

  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)

  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)

  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)

  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)

  • Various bug fixes (bsc#1027519)

Record
SUSE-SU-2020:2790-1
Updated
2026-11-02
OSVSUSE-SU-2020:2791-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)
  • CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)
  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • Various other fixes (bsc#1027519)
Record
SUSE-SU-2020:2791-1
Updated
2026-11-02
OSVSUSE-SU-2020:2822-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)
  • CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)
  • CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)
  • CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)
  • CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)
  • CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)
  • CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)
  • CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)
  • CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).
  • CVE-2020-0543: Fixed a leak of Special Register Buffer Data Sampling (SRBDS) aka 'CrossTalk' (bsc#1172205,XSA-320)
  • CVE-2020-15565: Fixed an issue cache write (bsc#1173378,XSA-321).
  • CVE-2020-15567: Fixed an issue with non-atomic modification of live EPT PTE (bsc#1173380,XSA-328)
Record
SUSE-SU-2020:2822-1
Updated
2026-11-02
OSVUSN-5617-1 No score

xen vulnerabilities

It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information. (CVE-2020-0543)

Julien Grall discovered that Xen incorrectly handled memory barriers on ARM-based systems. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information or escalate privileges. (CVE-2020-11739)

Ilja Van Sprundel discovered that Xen incorrectly handled profiling of guests. An unprivileged attacker could use this issue to obtain sensitive information from other guests, cause a denial of service or possibly gain privileges. (CVE-2020-11740, CVE-2020-11741)

It was discovered that Xen incorrectly handled grant tables. A malicious guest could possibly use this issue to cause a denial of service. (CVE-2020-11742, CVE-2020-11743)

Jan Beulich discovered that Xen incorrectly handled certain code paths. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-15563)

Julien Grall discovered that Xen incorrectly verified memory addresses provided by the guest on ARM-based systems. A malicious guest administrator could possibly use this issue to cause a denial of service. (CVE-2020-15564)

Roger Pau Monné discovered that Xen incorrectly handled caching on x86 Intel systems. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-15565)

It was discovered that Xen incorrectly handled error in event-channel port allocation. A malicious guest could possibly use this issue to cause a denial of service. (CVE-2020-15566)

Jan Beulich discovered that Xen incorrectly handled certain EPT (Extended Page Tables). An attacker could possibly use this issue to cause a denial of service, data corruption or privilege escalation. (CVE-2020-15567)

Andrew Cooper discovered that Xen incorrectly handled PCI passthrough. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25595)

Andrew Cooper discovered that Xen incorrectly sanitized path injections. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25596)

Jan Beulich discovered that Xen incorrectly handled validation of event channels. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25597)

Julien Grall and Jan Beulich discovered that Xen incorrectly handled resetting event channels. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information. (CVE-2020-25599)

Julien Grall discovered that Xen incorrectly handled event channels memory allocation on 32-bits domains. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25600)

Jan Beulich discovered that Xen incorrectly handled resetting or cleaning up event channels. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25601)

Andrew Cooper discovered that Xen incorrectly handled certain Intel specific MSR (Model Specific Registers). An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25602)

Julien Grall discovered that Xen incorrectly handled accessing/allocating event channels. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information of privilege escalation. (CVE-2020-25603)

Igor Druzhinin discovered that Xen incorrectly handled locks. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25604)

Record
USN-5617-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.10
 3.2.0 up to 4.12.3-r4
4.12.3-r4
xen
Alpine:v3.11
 3.2.0 up to 4.13.1-r4
4.13.1-r4
xen
Alpine:v3.12
 3.2.0 up to 4.13.1-r4
4.13.1-r4
xen
Alpine:v3.13
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.14
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.15
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.16
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.17
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.18
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.19
 3.2.0 up to 4.14.0-r1
4.14.0-r1
Show 42 moreShow less
Affected packages
PackageAffectedFixed
xen
Alpine:v3.20
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.21
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.22
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.23
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.24
 3.2.0 up to 4.14.0-r1
4.14.0-r1
xen
Alpine:v3.9
 3.2.0 up to 4.11.4-r2
4.11.4-r2
xen
Debian:12
 before 4.14.0+80-gd101b417b7-1
4.14.0+80-gd101b417b7-1
xen
Debian:13
 before 4.14.0+80-gd101b417b7-1
4.14.0+80-gd101b417b7-1
xen
Debian:14
 before 4.14.0+80-gd101b417b7-1
4.14.0+80-gd101b417b7-1
xen
Debian:10
From an advisory covering 9 CVEs
 before 4.11.4+37-g3263f257ca-1, plus listed versions
4.11.1+92-g6c33308a8d-24.11.3+24-g14b62ab3e5-14.11.3+24-g14b62ab3e5-1~deb10u14.11.4+24-gddaaccbbab-14.11.4+24-gddaaccbbab-1~deb10u14.11.4-1
4.11.4+37-g3263f257ca-1
xen
SUSE:Linux Enterprise Server 11 SP4-LTSS
From an advisory covering 11 CVEs
 before 4.4.4_44-61.55.1
4.4.4_44-61.55.1
xen
SUSE:OpenStack Cloud 9
From an advisory covering 10 CVEs
 before 4.11.4_08-2.36.1
4.11.4_08-2.36.1
xen
SUSE:OpenStack Cloud Crowbar 9
From an advisory covering 10 CVEs
 before 4.11.4_08-2.36.1
4.11.4_08-2.36.1
xen
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 10 CVEs
 before 4.11.4_08-2.36.1
4.11.4_08-2.36.1
xen
SUSE:Linux Enterprise Server 12 SP4-LTSS
From an advisory covering 10 CVEs
 before 4.11.4_08-2.36.1
4.11.4_08-2.36.1
xen
SUSE:HPE Helion OpenStack 8
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:OpenStack Cloud 8
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:OpenStack Cloud Crowbar 8
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:Linux Enterprise Server for SAP Applications 12 SP3
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:Linux Enterprise Server 12 SP3-LTSS
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:Linux Enterprise Server 12 SP3-BCL
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:Enterprise Storage 5
From an advisory covering 9 CVEs
 before 4.9.4_12-3.74.1
4.9.4_12-3.74.1
xen
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 11 CVEs
 before 4.12.3_08-3.24.1
4.12.3_08-3.24.1
xen
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 11 CVEs
 before 4.12.3_08-3.24.1
4.12.3_08-3.24.1
xen
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 11 CVEs
 before 4.12.3_08-3.24.1
4.12.3_08-3.24.1
xen
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
From an advisory covering 8 CVEs
 before 4.10.4_16-3.41.1
4.10.4_16-3.41.1
xen
SUSE:Linux Enterprise High Performance Computing 15-LTSS
From an advisory covering 8 CVEs
 before 4.10.4_16-3.41.1
4.10.4_16-3.41.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15
From an advisory covering 8 CVEs
 before 4.10.4_16-3.41.1
4.10.4_16-3.41.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP1
From an advisory covering 10 CVEs
 before 4.12.3_08-3.28.1
4.12.3_08-3.28.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP1
From an advisory covering 10 CVEs
 before 4.12.3_08-3.28.1
4.12.3_08-3.28.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP2
From an advisory covering 10 CVEs
 before 4.13.1_08-3.10.1
4.13.1_08-3.10.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP2
From an advisory covering 10 CVEs
 before 4.13.1_08-3.10.1
4.13.1_08-3.10.1
xen
SUSE:OpenStack Cloud 7
From an advisory covering 12 CVEs
 before 4.7.6_10-43.67.1
4.7.6_10-43.67.1
xen
SUSE:Linux Enterprise Server for SAP Applications 12 SP2
From an advisory covering 12 CVEs
 before 4.7.6_10-43.67.1
4.7.6_10-43.67.1
xen
SUSE:Linux Enterprise Server 12 SP2-LTSS
From an advisory covering 12 CVEs
 before 4.7.6_10-43.67.1
4.7.6_10-43.67.1
xen
SUSE:Linux Enterprise Server 12 SP2-BCL
From an advisory covering 12 CVEs
 before 4.7.6_10-43.67.1
4.7.6_10-43.67.1
xen
Ubuntu:16.04:LTS
 All versions, plus listed versions
4.5.1-0ubuntu14.5.1-0ubuntu24.6.0-1ubuntu14.6.0-1ubuntu24.6.0-1ubuntu4
Show 7 moreShow less
4.6.0-1ubuntu4.14.6.0-1ubuntu4.24.6.0-1ubuntu4.34.6.5-0ubuntu14.6.5-0ubuntu1.14.6.5-0ubuntu1.24.6.5-0ubuntu1.4
 None known
xen
Ubuntu:18.04:LTS
 All versions, plus listed versions
4.9.0-0ubuntu34.9.0-0ubuntu44.9.2-0ubuntu1
 None known
xen
Ubuntu:20.04:LTS
 before 4.11.3+24-g14b62ab3e5-1ubuntu2.3, plus listed versions
4.9.2-0ubuntu24.9.2-0ubuntu64.9.2-0ubuntu74.11.3+24-g14b62ab3e5-1ubuntu14.11.3+24-g14b62ab3e5-1ubuntu24.11.3+24-g14b62ab3e5-1ubuntu2.2
4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen
Ubuntu:20.04:LTS
From an advisory covering 20 CVEs
 before 4.11.3+24-g14b62ab3e5-1ubuntu2.3, plus listed versions
4.9.2-0ubuntu24.9.2-0ubuntu64.9.2-0ubuntu74.11.3+24-g14b62ab3e5-1ubuntu14.11.3+24-g14b62ab3e5-1ubuntu24.11.3+24-g14b62ab3e5-1ubuntu2.2
4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen
openSUSE:Leap 15.2
From an advisory covering 10 CVEs
 before 4.13.1_08-lp152.2.9.1
4.13.1_08-lp152.2.9.1
xen
openSUSE:Tumbleweed
From an advisory covering 93 CVEs
 before 4.15.1_01-1.2
4.15.1_01-1.2

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-25596 is a medium vulnerability (CVSS 5.5) in Xen, published September 23, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. Fixed in xen 4.12.3-r4.

References

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