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Fencer Vulns
medium 4.4

CVE-2023-2612 json

shiftfs lock unbalance in Ubuntu-specific kernels

published 2023-05-30 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-34086

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

Jean-Baptiste Cayrou discovered that the shiftfs file system in the Ubuntu Linux kernel contained a race condition when handling inode locking in some situations. A local attacker could use this to cause a denial of service (kernel deadlock).

Patch / fix

  • Canonical Ltd. ubuntu-linux 02b47547824b1cd0d55c6744f91886f04de8947e
  • linux Ubuntu 20.04 LTS 5.4.0-150.167
  • linux Ubuntu 22.04 LTS 5.15.0-73.80
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1103.111
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1037.41
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1106.115
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1035.43
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1100.107
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1034.39

ubuntu advisories UBUNTU-CVE-2023-2612

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Canonical Ltd. ubuntu-linux

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.