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Fencer Vulns
medium 6.4

CVE-2022-26362 json

x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count.

published 2022-06-09 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-30921

cvss
6.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.16.2-1

debian advisories DEBIAN-CVE-2022-26362

  • xen SLES for SAP 15, SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 4.10.4_36-150000.3.77.1
  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.4_26-150100.3.75.1
  • xen SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 4.14.5_04-150300.3.32.1
  • xen SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 4.16.1_06-150400.4.8.1
  • xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 4.13.4_12-150200.3.58.1
  • xen SLES 12 SP3-BCL 4.9.4_30-3.106.1
  • xen SLES 12 SP2-BCL 4.7.6_24-43.91.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.11.4_30-2.76.1

suse advisories SUSE-SU-2022:2601-1SUSE-SU-2022:2600-1SUSE-SU-2022:2599-2SUSE-SU-2022:2599-1SUSE-SU-2022:2597-1SUSE-SU-2022:2591-1

  • xen openSUSE Tumbleweed 4.16.1_02-3.1

opensuse advisories openSUSE-SU-2024:12219-1

  • xen Alpine 3.13 4.14.5-r1
  • xen Alpine 3.15, Alpine 3.14 4.15.2-r1
  • xen Alpine 3.16 4.16.1-r1
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 4.16.1-r2

alpine advisories ALPINE-CVE-2022-26362

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

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

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.