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Fencer Vulns
medium 6.5

CVE-2026-62437 json

x86: DMs may cause mem leak by IRQ binding

published 2026-09-08 2 mo ago modified 2026-09-10 59 d ago also EUVD-2026-72719

cvss
6.5
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 0%
public exploits
0
none known

Summary

When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be.

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-2026-62437

  • xen SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 4.20.4_04-150700.3.46.1
  • xen SLE Micro 5.4, SLE Micro 5.3 4.16.7_14-150400.4.92.1
  • xen SLE Micro 5.5 4.17.6_16-150500.3.79.1
  • xen SLES LTSS Extended Security 12 SP5 4.12.4_74-3.151.1

suse advisories SUSE-SU-2026:4090-1SUSE-SU-2026:4089-1SUSE-SU-2026:4088-1SUSE-SU-2026:4087-1

  • xen openSUSE Tumbleweed 4.22.0_04-1.1

opensuse advisories openSUSE-SU-2026:11738-1

  • xen Alpine 3.21 4.19.6-r1
  • xen Alpine 3.23, Alpine 3.22 4.20.4-r1
  • xen Alpine 3.24 4.21.2-r1

alpine advisories ALPINE-CVE-2026-62437

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-2026-62437 updated cvss 6.5

xen: Xen: Memory leak due to re-established IRQ tracking structures during guest termination

  • 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
59 d ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/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.