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Fencer Vulns
high 8.8

CVE-2026-79610 json

grant-table: double version change race

published 2026-10-13 27 d ago modified 2026-10-20 19 d ago also EUVD-2026-98827

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

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.

Patch / fix

  • xen Debian 12 4.17.7+13-g2445b30a44-0+deb12u1
  • xen Debian 13 4.20.4+39-gf1e1321c87-0+deb13u1
  • xen Debian 14 4.20.4+39-gf1e1321c87-1

debian advisories DEBIAN-CVE-2026-79610

  • xen SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 4.20.4_06-150700.3.49.2
  • xen SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 4.16.7_16-150400.4.95.1
  • xen SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 4.17.7_02-150500.3.82.1
  • xen SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 4.12.4_76-3.154.1

suse advisories SUSE-SU-2026:4942-1SUSE-SU-2026:4732-1SUSE-SU-2026:4642-1SUSE-SU-2026:4641-1

  • xen openSUSE Tumbleweed 4.22.0_06-1.1

opensuse advisories openSUSE-SU-2026:12138-1

  • xen Alpine 3.21 4.19.6-r2
  • xen Alpine 3.23, Alpine 3.22 4.20.4-r2
  • xen Alpine 3.24 4.21.2-r2

alpine advisories ALPINE-CVE-2026-79610

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-79610 updated cvss 8.8

xen: Xen: Host privilege escalation via stale grant table pointers

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
19 d ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Xen Xen

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.