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CVE-2021-28701

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned...

7.8 HighFix available

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.27%Down 0.6 points since Sep 9, 2021

What each source reports

NVD Score used7.8

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: CVE-2021-28701
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0: 4.4 MediumAV:L/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-362
Updated: 2026-11-02

CVE ListNo score

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: CVE-2021-28701
Updated: 2026-11-02

EUVDEUVD-2021-15358No score

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: EUVD-2021-15358
Updated: 2026-11-03

GitHub AdvisoriesGHSA-423x-f92f-r5fm7.8

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned...

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: GHSA-423x-f92f-r5fm
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-269, CWE-362
Updated: 2026-11-02

OSVALPINE-CVE-2021-287017.8

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: ALPINE-CVE-2021-28701
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

OSV7.8

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: CVE-2021-28701
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

Show 14 moreShow less

OSVDEBIAN-CVE-2021-287017.8

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: DEBIAN-CVE-2021-28701
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-287017.8

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Record: UBUNTU-CVE-2021-28701
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2021:1301-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Upstream bug fixes (bsc#1027519)

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

Record: openSUSE-SU-2021:1301-1
Updated: 2026-11-02

OSVopenSUSE-SU-2021:3140-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Upstream bug fixes (bsc#1027519)

Record: openSUSE-SU-2021:3140-1
Updated: 2026-11-02

OSVSUSE-SU-2021:14848-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-0089: Fixed Speculative Code Store Bypass (XSA-375) (bsc#1186433).
CVE-2021-20255: Fixed stack overflow via infinite recursion in eepro100 (bsc#1182654).
CVE-2021-28690: Fixed x86 TSX Async Abort protections not restored after S3 (XSA-377) (bsc#1186434).
CVE-2021-28692: Fixed inappropriate x86 IOMMU timeout detection / handling (XSA-373) (bsc#1186429).
CVE-2021-28697: Fixed grant table v2 status pages may remain accessible after de-allocation (XSA-379) (bsc#1189376).
CVE-2021-28698: Fixed long running loops in grant table handling. (XSA-380) (bsc#1189378).
CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
CVE-2021-28703: Fixed grant table v2 status pages may remain accessible after de-allocation (take two) (XSA-387) (bsc#1192555).
CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).
CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
CVE-2021-3527: Fixed unbounded stack allocation in usbredir (bsc#1186013).
CVE-2021-3592: Fixed invalid pointer initialization may lead to information disclosure in slirp (bootp) (bsc#1187369).
CVE-2021-3594: Fixed invalid pointer initialization may lead to information disclosure in slirp (udp) (bsc#1187378).
CVE-2021-3595: Fixed invalid pointer initialization may lead to information disclosure in slirp (tftp) (bsc#1187376).
CVE-2021-3682: Fixed free call on invalid pointer in usbredir bufp_alloc (bsc#1189150).
CVE-2021-3930: Fixed off-by-one error in mode_sense_page() in hw/scsi/scsi-disk.c (bsc#1192526).

Record: SUSE-SU-2021:14848-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3140-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Upstream bug fixes (bsc#1027519)

Record: SUSE-SU-2021:3140-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3140-2No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Upstream bug fixes (bsc#1027519)

Record: SUSE-SU-2021:3140-2
Updated: 2026-11-02

OSVSUSE-SU-2021:3141-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Upstream bug fixes (bsc#1027519)

Record: SUSE-SU-2021:3141-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3181-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Upstream bug fixes (bsc#1027519)

Record: SUSE-SU-2021:3181-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3213-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
Integrate bugfixes (bsc#1189373, bsc#1189378).

Record: SUSE-SU-2021:3213-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3322-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
CVE-2021-28694,CVE-2021-28695,CVE-2021-28696: Fixed IOMMU page mapping issues on x86 (XSA-378)(bsc#1189373).
CVE-2021-28697: Fixed grant table v2 status pages that may remain accessible after de-allocation (XSA-379)(bsc#1189376).
CVE-2021-28698: Fixed long running loops in grant table handling (XSA-380)(bsc#1189378).
CVE-2021-20255: Fixed eepro100 stack overflow via infinite recursion (bsc#1182654).
CVE-2021-3592: Fixed invalid pointer initialization may lead to information disclosure (bootp) (bsc#1187369).
CVE-2021-3594: Fixed invalid pointer initialization may lead to information disclosure (udp) (bsc#1187378).
CVE-2021-3595: Fixed invalid pointer initialization may lead to information disclosure (tftp) (bsc#1187376).
CVE-2021-28692: Fixed inappropriate x86 IOMMU timeout detection / handling (XSA-373)(bsc#1186429).
CVE-2021-0089: Fixed Speculative Code Store Bypass (XSA-375)(bsc#1186433).
CVE-2021-28690: Fixed x86 TSX Async Abort protections not restored after S3 (XSA-377)(bsc#1186434).
Prevent superpage allocation in the LAPIC and ACPI_INFO range (bsc#1189882).

Record: SUSE-SU-2021:3322-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3842-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).
CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).
CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
Integrate bugfixes (bsc#1189373, bsc#1189378).

Record: SUSE-SU-2021:3842-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3849-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).
CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).
CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
Integrate bugfixes (bsc#1189373, bsc#1189378)

Record: SUSE-SU-2021:3849-1
Updated: 2026-11-02

OSVSUSE-SU-2021:3977-1No score

Security update for xen

This update for xen fixes the following issues:

CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).
CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).
CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).
CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
Upstream bug fixes (bsc#1027519)

Record: SUSE-SU-2021:3977-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`xen` Alpine:v3.11	4.0.0 up to 4.13.3-r3	4.13.3-r3
`xen` Alpine:v3.12	4.0.0 up to 4.13.3-r3	4.13.3-r3
`xen` Alpine:v3.13	4.0.0 up to 4.14.2-r1	4.14.2-r1
`xen` Alpine:v3.14	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.15	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.16	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.17	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.18	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.19	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.20	4.0.0 up to 4.15.0-r3	4.15.0-r3

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Affected packages
Package	Affected	Fixed
`xen` Alpine:v3.21	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.22	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.23	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Alpine:v3.24	4.0.0 up to 4.15.0-r3	4.15.0-r3
`xen` Debian:12	before 4.14.3-1	4.14.3-1
`xen` Debian:13	before 4.14.3-1	4.14.3-1
`xen` Debian:14	before 4.14.3-1	4.14.3-1
`xen` Debian:11 From an advisory covering 8 CVEs	before 4.14.3-1~deb11u1, plus listed versions 4.14.2+25-gb6a8c4f72d-2	4.14.3-1~deb11u1
`xen` SUSE:Linux Enterprise Server 11 SP4-LTSS From an advisory covering 17 CVEs	before 4.4.4_50-61.67.1	4.4.4_50-61.67.1
`xen` SUSE:Linux Enterprise Module for Basesystem 15 SP3	before 4.14.2_06-3.12.1	4.14.2_06-3.12.1
`xen` SUSE:Linux Enterprise Module for Server Applications 15 SP3	before 4.14.2_06-3.12.1	4.14.2_06-3.12.1
`xen` SUSE:Linux Enterprise Micro 5.1	before 4.14.2_06-3.12.1	4.14.2_06-3.12.1
`xen` SUSE:Linux Enterprise Module for Basesystem 15 SP2	before 4.13.3_04-3.37.1	4.13.3_04-3.37.1
`xen` SUSE:Linux Enterprise Module for Server Applications 15 SP2	before 4.13.3_04-3.37.1	4.13.3_04-3.37.1
`xen` SUSE:Linux Enterprise Micro 5.0	before 4.13.3_04-3.37.1	4.13.3_04-3.37.1
`xen` SUSE:Linux Enterprise Software Development Kit 12 SP5	before 4.12.4_14-3.52.1	4.12.4_14-3.52.1
`xen` SUSE:Linux Enterprise Server 12 SP5	before 4.12.4_14-3.52.1	4.12.4_14-3.52.1
`xen` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	before 4.12.4_14-3.52.1	4.12.4_14-3.52.1
`xen` SUSE:HPE Helion OpenStack 8	before 4.9.4_22-3.94.2	4.9.4_22-3.94.2
`xen` SUSE:OpenStack Cloud 8	before 4.9.4_22-3.94.2	4.9.4_22-3.94.2
`xen` SUSE:OpenStack Cloud Crowbar 8	before 4.9.4_22-3.94.2	4.9.4_22-3.94.2
`xen` SUSE:Linux Enterprise Server for SAP Applications 12 SP3	before 4.9.4_22-3.94.2	4.9.4_22-3.94.2
`xen` SUSE:Linux Enterprise Server 12 SP3-LTSS	before 4.9.4_22-3.94.2	4.9.4_22-3.94.2
`xen` SUSE:Linux Enterprise Server 12 SP3-BCL	before 4.9.4_22-3.94.2	4.9.4_22-3.94.2
`xen` SUSE:Linux Enterprise Server 12 SP2-BCL From an advisory covering 13 CVEs	before 4.7.6_16-43.79.5	4.7.6_16-43.79.5
`xen` SUSE:Linux Enterprise High Performance Computing 15-ESPOS From an advisory covering 7 CVEs	before 4.10.4_30-3.68.1	4.10.4_30-3.68.1
`xen` SUSE:Linux Enterprise High Performance Computing 15-LTSS From an advisory covering 7 CVEs	before 4.10.4_30-3.68.1	4.10.4_30-3.68.1
`xen` SUSE:Linux Enterprise Server for SAP Applications 15 From an advisory covering 7 CVEs	before 4.10.4_30-3.68.1	4.10.4_30-3.68.1
`xen` SUSE:OpenStack Cloud 9 From an advisory covering 7 CVEs	before 4.11.4_24-2.65.1	4.11.4_24-2.65.1
`xen` SUSE:OpenStack Cloud Crowbar 9 From an advisory covering 7 CVEs	before 4.11.4_24-2.65.1	4.11.4_24-2.65.1
`xen` SUSE:Linux Enterprise Server for SAP Applications 12 SP4 From an advisory covering 7 CVEs	before 4.11.4_24-2.65.1	4.11.4_24-2.65.1
`xen` SUSE:Linux Enterprise Server 12 SP4-LTSS From an advisory covering 7 CVEs	before 4.11.4_24-2.65.1	4.11.4_24-2.65.1
`xen` SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS From an advisory covering 8 CVEs	before 4.12.4_16-3.57.1	4.12.4_16-3.57.1
`xen` SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS From an advisory covering 8 CVEs	before 4.12.4_16-3.57.1	4.12.4_16-3.57.1
`xen` SUSE:Linux Enterprise Server 15 SP1-BCL From an advisory covering 8 CVEs	before 4.12.4_16-3.57.1	4.12.4_16-3.57.1
`xen` SUSE:Linux Enterprise Server 15 SP1-LTSS From an advisory covering 8 CVEs	before 4.12.4_16-3.57.1	4.12.4_16-3.57.1
`xen` SUSE:Linux Enterprise Server for SAP Applications 15 SP1 From an advisory covering 8 CVEs	before 4.12.4_16-3.57.1	4.12.4_16-3.57.1
`xen` SUSE:Enterprise Storage 6 From an advisory covering 8 CVEs	before 4.12.4_16-3.57.1	4.12.4_16-3.57.1
`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	All versions, 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-g14b62ab3e5-1ubuntu2.24.11.3+24-g14b62ab3e5-1ubuntu2.3	None known
`xen` Ubuntu:22.04:LTS	All versions, plus listed versions 4.11.4+24-gddaaccbbab-1ubuntu24.16.0-1~ubuntu24.16.0-1~ubuntu2.1	None known
`xen` Ubuntu:24.04:LTS	All versions, plus listed versions 4.17.2-14.17.2+55-g0b56bed864-14.17.2+76-ge1f9cb16e2-14.17.2+76-ge1f9cb16e2-1ubuntu14.17.3+10-g091466ba55-14.17.3+10-g091466ba55-1.1ubuntu24.17.3+10-g091466ba55-1.1ubuntu3	None known
`xen` Ubuntu:25.10	All versions, plus listed versions 4.20.0-1ubuntu14.20.0+68-g35cb38b222-1	None known
`xen` Ubuntu:26.10	All versions, plus listed versions 4.20.2+7-g1badcf5035-2build24.20.2+37-g61ff35323e-1ubuntu14.20.3+127-gc42374a105-1	None known
`xen` Ubuntu:26.04:LTS	All versions, plus listed versions 4.20.0+68-g35cb38b222-14.20.2+7-g1badcf5035-24.20.2+7-g1badcf5035-2build2	None known
`xen` openSUSE:Leap 15.2	before 4.13.3_04-lp152.2.30.1	4.13.3_04-lp152.2.30.1
`xen` openSUSE:Leap 15.3	before 4.14.2_06-3.12.1	4.14.2_06-3.12.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-28701 is a high vulnerability (CVSS 7.8) in Xen, published September 8, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 18th percentile. Fixed in xen 4.13.3-r3.

References

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