7.5

CVE-2022-50668: linux

CVSS: 7.5v3.1HighDeferred
AliasesUBUNTU-CVE-2022-50668DEBIAN-CVE-2022-50668
Published 09-12-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2022-50668 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 56.3% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.81%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 7
RHSA-2023:2458RHSA-2024:3138SUSE-SU-2026:0263-1SUSE-SU-2026:0316-1SUSE-SU-2026:0317-1SUSE-SU-2026:0350-1

Timeline

  1. 09-12-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix deadlock due to mbcache entry corruption When manipulating xattr blocks, we can deadlock infinitely looping inside ext4_xattr_block_set() where we constantly keep finding xattr block for reuse in mbcache but we are unable to reuse it because its reference count is too big. This happens because cache entry for the xattr block is marked as reusable (e_reusable set) although its reference count is too big. When this inconsistency happens, this inconsistent state is kept indefinitely and so ext4_xattr_block_set() keeps retrying indefinitely. The inconsistent state is caused by non-atomic update of e_reusable bit. e_reusable is part of a bitfield and e_reusable update can race with update of e_referenced bit in the same bitfield resulting in loss of one of the updates. Fix the problem by using atomic bitops instead. This bug has been around for many years, but it became *much* easier to hit after commit 65f8b80053a1 ("ext4: fix race when reusing xattr blocks").

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

0.00 pp

From 0.81% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.81%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu121 products
  • linuxAll versions (No fix recorded) | < 5.4.0-144.161 | < 5.15.0-69.76
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1097.105 | < 5.15.0-1033.37
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.4-1
Linux1 product
  • linux≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < efaa0ca678f56d47316a08030b2515678cebbc50 | ≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < af53065276376750dfac35a7248af18806404c5d | ≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < 1be16a0c2f10186df505e28b0cc92d7f3366e2a8 | ≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < 5bc0b2fda4b47c86278f7c6d30c211f425bf51cf | ≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < 127b80cefb941a81255c72f11081123f3a705369 | ≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < cc1538c693d25e282bed8c54b65c914a04023a78 | ≥ 6048c64b26097a0ffbd966866b599f990e674e9b, < a44e84a9b7764c72896f7241a0ec9ac7e7ef38dd | 4.6

3 vendors · 123 products

References

11 links
Show all 11 references