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CVE-2022-42327

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC...

7.1 HighFix available

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

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
High
Integrity
High
Availability
None

Exploit likelihood

0.24%Down 0.6 points since Nov 2, 2022
90%50%10%1%

What each source reports

NVD Score used 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
CVE-2022-42327
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
CVE List 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
CVE-2022-42327
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
EUVDEUVD-2022-45402 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
EUVD-2022-45402
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-rgfj-62rr-5vf5 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC...

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
GHSA-rgfj-62rr-5vf5
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
OSVALPINE-CVE-2022-42327 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
ALPINE-CVE-2022-42327
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-03
OSV 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
CVE-2022-42327
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2022-42327 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
DEBIAN-CVE-2022-42327
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-03
OSVUBUNTU-CVE-2022-42327 7.1

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Record
UBUNTU-CVE-2022-42327
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVSUSE-SU-2022:4007-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2022-33746: Fixed DoS due to excessively long P2M pool freeing (bsc#1203806).
  • CVE-2022-33748: Fixed DoS due to race in locking (bsc#1203807).
  • CVE-2022-42311, CVE-2022-42312, CVE-2022-42313, CVE-2022-42314, CVE-2022-42315, CVE-2022-42316, CVE-2022-42317, CVE-2022-42318: xen: Xenstore: Guests can let xenstored run out of memory (bsc#1204482)
  • CVE-2022-42309: xen: Xenstore: Guests can crash xenstored (bsc#1204485)
  • CVE-2022-42310: xen: Xenstore: Guests can create orphaned Xenstore nodes (bsc#1204487)
  • CVE-2022-42319: xen: Xenstore: Guests can cause Xenstore to not free temporary memory (bsc#1204488)
  • CVE-2022-42320: xen: Xenstore: Guests can get access to Xenstore nodes of deleted domains (bsc#1204489)
  • CVE-2022-42321: xen: Xenstore: Guests can crash xenstored via exhausting the stack (bsc#1204490)
  • CVE-2022-42322,CVE-2022-42323: xen: Xenstore: cooperating guests can create arbitrary numbers of nodes (bsc#1204494)
  • CVE-2022-42325,CVE-2022-42326: xen: Xenstore: Guests can create arbitrary number of nodes via transactions (bsc#1204496)
  • xen: Frontends vulnerable to backends (bsc#1193923).
Record
SUSE-SU-2022:4007-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.14
 before 4.15.4-r0
4.15.4-r0
xen
Alpine:v3.15
 before 4.15.4-r0
4.15.4-r0
xen
Alpine:v3.17
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.18
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.19
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.20
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.21
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.22
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.23
 before 4.16.2-r1
4.16.2-r1
xen
Alpine:v3.24
 before 4.16.2-r1
4.16.2-r1
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Affected packages
PackageAffectedFixed
xen
Debian:12
 before 4.16.2+90-g0d39a6d1ae-1
4.16.2+90-g0d39a6d1ae-1
xen
Debian:13
 before 4.16.2+90-g0d39a6d1ae-1
4.16.2+90-g0d39a6d1ae-1
xen
Debian:14
 before 4.16.2+90-g0d39a6d1ae-1
4.16.2+90-g0d39a6d1ae-1
xen
SUSE:Linux Enterprise Micro 5.3
From an advisory covering 21 CVEs
 before 4.16.2_08-150400.4.16.1
4.16.2_08-150400.4.16.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP4
From an advisory covering 21 CVEs
 before 4.16.2_08-150400.4.16.1
4.16.2_08-150400.4.16.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP4
From an advisory covering 21 CVEs
 before 4.16.2_08-150400.4.16.1
4.16.2_08-150400.4.16.1
xen
openSUSE:Leap 15.4
From an advisory covering 21 CVEs
 before 4.16.2_08-150400.4.16.1
4.16.2_08-150400.4.16.1
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

History

History
RecordedChangedSources
affected, factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2022-42327 is a high vulnerability (CVSS 7.1) in Fedoraproject Fedora, published November 1, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. Fixed in xen 4.15.4-r0.

References

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