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CVE-2026-42488

x86: mismatched mapcache metadata

8.1 HighFix available

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.35%Unchanged since Jun 23, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.1

x86: mismatched mapcache metadata

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
CVE-2026-42488
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-119
Updated
2026-11-02
EUVDEUVD-2026-37891 8.1

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
EUVD-2026-37891
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-7jcv-rhv5-mq52 8.1

Some shadow paging errors paths will switch the page-tables without updating the currently...

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
GHSA-7jcv-rhv5-mq52
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-119
Updated
2026-11-02
NVD 8.1

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
CVE-2026-42488
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-119
Updated
2026-11-02
OSVALPINE-CVE-2026-42488 8.1

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
ALPINE-CVE-2026-42488
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2026-42488 8.1

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
DEBIAN-CVE-2026-42488
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVUBUNTU-CVE-2026-42488 8.1

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Record
UBUNTU-CVE-2026-42488
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVSUSE-SU-2026:2328-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-42487: x86 HVM I/O port list traversal (bsc#1266952).
  • CVE-2026-42488: x86: mismatched mapcache metadata (bsc#1266955).
  • CVE-2026-42489,CVE-2026-42490: domctl lock open to abuse (bsc#1266953).
Record
SUSE-SU-2026:2328-1
Updated
2026-11-02
OSVSUSE-SU-2026:2329-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-42487: x86 HVM I/O port list traversal (bsc#1266952).
  • CVE-2026-42488: x86: mismatched mapcache metadata (bsc#1266955).
  • CVE-2026-42489,CVE-2026-42490: domctl lock open to abuse (bsc#1266953).
Record
SUSE-SU-2026:2329-1
Updated
2026-11-02
OSVSUSE-SU-2026:2364-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-42487: x86 HVM I/O port list traversal (bsc#1266952).
  • CVE-2026-42488: x86: mismatched mapcache metadata (bsc#1266955).
  • CVE-2026-42489,CVE-2026-42490: domctl lock open to abuse (bsc#1266953).
Record
SUSE-SU-2026:2364-1
Updated
2026-11-02
OSVSUSE-SU-2026:2613-1 No score

Security update for xen

This update for xen fixes the following issues

  • CVE-2025-54518: AMD-SN-7052: CPU OP Cache Corruption (bsc#1264066).
  • CVE-2026-42487: x86 HVM I/O port list traversal (bsc#1266952).
  • CVE-2026-42488: x86: mismatched mapcache metadata (bsc#1266955).
  • CVE-2026-42489,CVE-2026-42490: domctl lock open to abuse (bsc#1266953).
Record
SUSE-SU-2026:2613-1
Updated
2026-11-02
OSVSUSE-SU-2026:2668-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-42487: xen: x86 HVM I/O port list traversal (XSA-491) (bsc#1266952).
  • CVE-2026-42488: xen: x86: mismatched mapcache metadata (XSA-494) (bsc#1266955).
  • CVE-2026-42489,CVE-2026-42490: xen: domctl lock open to abuse (XSA-492) (bsc#1266953).
Record
SUSE-SU-2026:2668-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.20
 before 4.18.5-r9
4.18.5-r9
xen
Alpine:v3.21
 before 4.19.5-r4
4.19.5-r4
xen
Alpine:v3.22
 before 4.20.3-r4
4.20.3-r4
xen
Alpine:v3.23
 before 4.20.3-r4
4.20.3-r4
xen
Alpine:v3.24
 before 4.21.1-r6
4.21.1-r6
xen
Debian:12
 before 4.17.7-0+deb12u1, plus listed versions
4.17.1+2-gb773c48e36-14.17.2+55-g0b56bed864-14.17.2+76-ge1f9cb16e2-14.17.2+76-ge1f9cb16e2-1~deb12u14.17.2-1
Show 9 moreShow less
4.17.3+10-g091466ba55-14.17.3+10-g091466ba55-1.14.17.3+10-g091466ba55-1.1~exp14.17.3+10-g091466ba55-1.1~exp24.17.3+10-g091466ba55-1~deb12u14.17.3+36-g54dacb5c02-14.17.5+23-ga4e5191dc0-14.17.5+23-ga4e5191dc0-1+deb12u14.17.5+72-g01140da4e8-1
4.17.7-0+deb12u1
xen
Debian:13
 before 4.20.3+127-gc42374a105-0+deb13u1, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+37-g61ff35323e-0+deb13u14.20.2+37-g61ff35323e-14.20.2+7-g1badcf5035-0+deb13u14.20.2+7-g1badcf5035-14.20.2+7-g1badcf5035-2
4.20.3+127-gc42374a105-0+deb13u1
xen
Debian:14
 before 4.20.3+127-gc42374a105-1, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+37-g61ff35323e-14.20.2+7-g1badcf5035-14.20.2+7-g1badcf5035-2
4.20.3+127-gc42374a105-1
xen
SUSE:Linux Enterprise Micro 5.5
 before 4.17.6_12-150500.3.73.1
4.17.6_12-150500.3.73.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
 before 4.17.6_12-150500.3.73.1
4.17.6_12-150500.3.73.1
Show 23 moreShow less
Affected packages
PackageAffectedFixed
xen
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
 before 4.17.6_12-150500.3.73.1
4.17.6_12-150500.3.73.1
xen
SUSE:Linux Enterprise Server 15 SP5-LTSS
 before 4.17.6_12-150500.3.73.1
4.17.6_12-150500.3.73.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
 before 4.17.6_12-150500.3.73.1
4.17.6_12-150500.3.73.1
xen
SUSE:Linux Enterprise Server 15 SP6-LTSS
 before 4.18.5_18-150600.3.50.1
4.18.5_18-150600.3.50.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP6
 before 4.18.5_18-150600.3.50.1
4.18.5_18-150600.3.50.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP7
 before 4.20.3_06-150700.3.41.1
4.20.3_06-150700.3.41.1
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP7
 before 4.20.3_06-150700.3.41.1
4.20.3_06-150700.3.41.1
xen
SUSE:Linux Enterprise Micro 5.3
 before 4.16.7_10-150400.4.86.2
4.16.7_10-150400.4.86.2
xen
SUSE:Linux Enterprise Micro 5.4
 before 4.16.7_10-150400.4.86.2
4.16.7_10-150400.4.86.2
xen
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
 before 4.16.7_10-150400.4.86.2
4.16.7_10-150400.4.86.2
xen
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
 before 4.16.7_10-150400.4.86.2
4.16.7_10-150400.4.86.2
xen
SUSE:Linux Enterprise Server 15 SP4-LTSS
 before 4.16.7_10-150400.4.86.2
4.16.7_10-150400.4.86.2
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
 before 4.16.7_10-150400.4.86.2
4.16.7_10-150400.4.86.2
xen
SUSE:Linux Enterprise Server 12 SP5-LTSS
 before 4.12.4_70-3.145.1
4.12.4_70-3.145.1
xen
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
 before 4.12.4_70-3.145.1
4.12.4_70-3.145.1
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
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-42488 is a high vulnerability (CVSS 8.1) in Xen, published June 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 29th percentile. Fixed in xen 4.18.5-r9.

References

Show 17 moreShow less
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