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CVE-2026-23558

grant table v2 race in status page mapping

7.8 HighFix available

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

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

0.12%Up 0.1 points since May 20, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.8

grant table v2 race in status page mapping

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
CVE-2026-23558
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-362
Updated
2026-11-02
EUVDEUVD-2026-30928 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
EUVD-2026-30928
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
GitHub AdvisoriesGHSA-4qf9-g5cf-cx9j 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race...

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
GHSA-4qf9-g5cf-cx9j
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-362
Updated
2026-11-02
NVD 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
CVE-2026-23558
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-362
Updated
2026-11-02
OSVALPINE-CVE-2026-23558 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
ALPINE-CVE-2026-23558
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
OSVDEBIAN-CVE-2026-23558 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
DEBIAN-CVE-2026-23558
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 9 moreShow less
OSVUBUNTU-CVE-2026-23558 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Record
UBUNTU-CVE-2026-23558
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-2026:10660-1 No score

xen-4.21.1_04-1.1 on GA media

These are all security issues fixed in the xen-4.21.1_04-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10660-1
Updated
2026-11-02
OSVSUSE-SU-2026:1645-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2025-54505: floating point divider state sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
  • CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
  • CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).
Record
SUSE-SU-2026:1645-1
Updated
2026-11-02
OSVSUSE-SU-2026:1657-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2025-54505: floating point divider state sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
  • CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
  • CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).
Record
SUSE-SU-2026:1657-1
Updated
2026-11-02
OSVSUSE-SU-2026:1692-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
  • CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
  • CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).
Record
SUSE-SU-2026:1692-1
Updated
2026-11-02
OSVSUSE-SU-2026:1743-1 No score

Security update for xen

This update for xen fixes the following issues:

  • Update to Xen 4.20.3 bug fix release (bsc#1027519) (jsc#PED-8907).
  • CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
  • CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
  • CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).
Record
SUSE-SU-2026:1743-1
Updated
2026-11-02
OSVSUSE-SU-2026:1998-1 No score

Security update for xen

This update for xen fixes the following issue

  • CVE-2025-54518: AMD-SN-7052: CPU OP Cache Corruption (bsc#1264066).
Record
SUSE-SU-2026:1998-1
Updated
2026-11-02
OSVSUSE-SU-2026:2066-1 No score

Security update for xen

This update for xen fixes the following issues

  • CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
  • CVE-2025-54518: AMD-SN-7052: CPU OP Cache Corruption (bsc#1264066).
  • CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
  • CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).
Record
SUSE-SU-2026:2066-1
Updated
2026-11-02
OSVSUSE-SU-2026:2102-1 No score

Security update for xen

This update for xen fixes the following issues

  • CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
  • CVE-2025-54518: AMD-SN-7052: CPU OP Cache Corruption (bsc#1264066).
  • CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
  • CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).
Record
SUSE-SU-2026:2102-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.20
 4.0.0 up to 4.18.5-r7
4.18.5-r7
xen
Alpine:v3.21
 4.0.0 up to 4.19.5-r2
4.19.5-r2
xen
Alpine:v3.22
 4.0.0 up to 4.20.3-r2
4.20.3-r2
xen
Alpine:v3.23
 4.0.0 up to 4.20.3-r2
4.20.3-r2
xen
Alpine:v3.24
 4.0.0 up to 4.21.1-r3
4.21.1-r3
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
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
Show 7 moreShow less
Affected packages
PackageAffectedFixed
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:Tumbleweed
 before 4.21.1_04-1.1
4.21.1_04-1.1

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-2026-23558 is a high vulnerability (CVSS 7.8) in Xen, published April 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. Fixed in xen 4.18.5-r7.

References

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