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CVE-2026-79610

grant-table: double version change race

8.8 HighFix available

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

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
High

Exploit likelihood

0.15%Unchanged since Oct 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.8

grant-table: double version change race

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
CVE-2026-79610
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-362
Updated
2026-11-02
EUVDEUVD-2026-98827 8.8

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
EUVD-2026-98827
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-mm4r-fcq9-pfr4 8.8

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table...

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
GHSA-mm4r-fcq9-pfr4
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-362
Updated
2026-11-02
NVD 8.8

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
CVE-2026-79610
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-362
Updated
2026-11-02
OSVALPINE-CVE-2026-79610 8.8

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
ALPINE-CVE-2026-79610
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2026-79610 8.8

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
DEBIAN-CVE-2026-79610
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-04
Show 6 moreShow less
OSVUBUNTU-CVE-2026-79610 8.8

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

Record
UBUNTU-CVE-2026-79610
CVSS 3.1
8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:12138-1 No score

xen-4.22.0_06-1.1 on GA media

These are all security issues fixed in the xen-4.22.0_06-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12138-1
Updated
2026-11-02
OSVSUSE-SU-2026:4641-1 No score

Security update for xen

This update for xen fixes the following issues:

Security issues fixed:

  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).

Non security issue fixed:

  • Xen: Missing upstream bug fixes (bsc#1027519).
Record
SUSE-SU-2026:4641-1
Updated
2026-11-02
OSVSUSE-SU-2026:4642-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).
Record
SUSE-SU-2026:4642-1
Updated
2026-11-02
OSVSUSE-SU-2026:4732-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).
Record
SUSE-SU-2026:4732-1
Updated
2026-11-02
OSVSUSE-SU-2026:4942-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-79608: x86/AMD: ineffectual Zenbleed workaround (bsc#1283317).
  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).
Record
SUSE-SU-2026:4942-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.21
 before 4.19.6-r2
4.19.6-r2
xen
Alpine:v3.22
 before 4.20.4-r2
4.20.4-r2
xen
Alpine:v3.23
 before 4.20.4-r2
4.20.4-r2
xen
Alpine:v3.24
 before 4.21.2-r2
4.21.2-r2
xen
Debian:12
 before 4.17.7+13-g2445b30a44-0+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 10 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-g01140da4e8-14.17.7-0+deb12u1
4.17.7+13-g2445b30a44-0+deb12u1
xen
Debian:13
 before 4.20.4+39-gf1e1321c87-0+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-g1badcf5035-24.20.3+127-gc42374a105-0+deb13u14.20.3+127-gc42374a105-1
4.20.4+39-gf1e1321c87-0+deb13u1
xen
Debian:14
 before 4.20.4+39-gf1e1321c87-1, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+37-g61ff35323e-14.20.2+7-g1badcf5035-14.20.2+7-g1badcf5035-24.20.3+127-gc42374a105-1
4.20.4+39-gf1e1321c87-1
xen
SUSE:Linux Enterprise Micro 5.5
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
Show 20 moreShow less
Affected packages
PackageAffectedFixed
xen
SUSE:Linux Enterprise Server 15 SP5-LTSS
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise Micro 5.3
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Micro 5.4
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Server 15 SP4-LTSS
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Server 12 SP5-LTSS
 before 4.12.4_76-3.154.1
4.12.4_76-3.154.1
xen
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
 before 4.12.4_76-3.154.1
4.12.4_76-3.154.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP7
 before 4.20.4_06-150700.3.49.2
4.20.4_06-150700.3.49.2
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP7
 before 4.20.4_06-150700.3.49.2
4.20.4_06-150700.3.49.2
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: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 4.22.0_06-1.1
4.22.0_06-1.1

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-2026-79610 is a high vulnerability (CVSS 8.8) in Xen, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 3rd percentile. Fixed in xen 4.19.6-r2.

References

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