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Fencer Vulns
medium 4.4

CVE-2026-102704 json

arbitrary read/write via grant copy

published 2026-11-04 5 d ago modified 2026-11-06 2 d ago also EUVD-2026-116864

cvss
4.4
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

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

A common access pattern is a batch of Grant Copy operations acting on adjacent address ranges in the same source or destination page. For performance reasons, Xen caches details internally to reuse already validated data. The conditions on when to re-validate the internal data were not correct in some cases:

- Frame numbers and grant references could wrongly be mixed up. This is CVE-2026-102703.

- Copying by frame number (rather than grant reference) is permitted only when operating on the caller's own memory. The check to enforce this restriction was misplaced. This is CVE-2026-102704.

Patch / fix

  • xen Debian 12 4.17.7+13-g2445b30a44-0+deb12u1
  • xen Debian 13 4.20.4+63-g7abfd2bce2-0+deb13u1

debian advisories DEBIAN-CVE-2026-102704

  • xen SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 4.20.4_08-150700.3.52.1

suse advisories SUSE-SU-2026:5087-1

  • xen Alpine 3.21 4.19.6-r3
  • xen Alpine 3.23, Alpine 3.22 4.20.4-r3
  • xen Alpine 3.24 4.21.2-r3

alpine advisories ALPINE-CVE-2026-102704

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-2026-102704 updated cvss 8.8

xen: xen: Privilege escalation via misplaced grant copy validation

  • 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
partial
Assessed
4 d ago

Exploit prediction

0.14% 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 4.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CNA 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

  • Xen Xen

Classification

Weakness
  • CWE-693 Protection Mechanism Failure

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.