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Fencer Vulns
medium 5.6

CVE-2022-26356 json

Racy interactions between dirty vram tracking and paging log dirty hypercalls Activation of log dirty mode done by XEN_DMOP_track_dirty_vra…

published 2022-04-05 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-30915

cvss
5.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

Racy interactions between dirty vram tracking and paging log dirty hypercalls Activation of log dirty mode done by XEN_DMOP_track_dirty_vram (was named HVMOP_track_dirty_vram before Xen 4.9) is racy with ongoing log dirty hypercalls. A suitably timed call to XEN_DMOP_track_dirty_vram can enable log dirty while another CPU is still in the process of tearing down the structures related to a previously enabled log dirty mode (XEN_DOMCTL_SHADOW_OP_OFF). This is due to lack of mutually exclusive locking between both operations and can lead to entries being added in already freed slots, resulting in a memory leak.

Patch / fix

  • xen xen 4.12.0, 4.14.0, 4.16.0
  • xen Debian 14, Debian 13, Debian 12 4.16.1-1

debian advisories DEBIAN-CVE-2022-26356

  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.4_24-150100.3.72.1
  • xen SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +2 more 4.14.4_04-150300.3.24.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_22-3.66.1
  • xen SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 4.9.4_28-3.103.1
  • xen SLES 12 SP2-BCL 4.7.6_22-43.88.1
  • xen SLES for SAP 15, SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 4.10.4_34-150000.3.74.1
  • xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +8 more 4.13.4_08-150200.3.50.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.11.4_28-2.73.1

suse advisories SUSE-SU-2022:2158-1SUSE-SU-2022:1506-1SUSE-SU-2022:1505-1SUSE-SU-2022:1408-1SUSE-SU-2022:1375-1SUSE-SU-2022:1359-1

  • xen openSUSE Tumbleweed 4.16.0_08-1.1

opensuse advisories openSUSE-SU-2024:11979-1

  • xen Alpine 3.12 4.13.4-r3
  • xen Alpine 3.13 4.14.5-r0
  • xen Alpine 3.15, Alpine 3.14 4.15.2-r2
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 4.16.1-r0

alpine advisories ALPINE-CVE-2022-26356

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

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.6 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD 2.0 4.0 AV:L/AC:H/Au:N/C:N/I:N/A:C

Affected products

  • Xen xen

Classification

Weakness

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.