7.8

CVE-2022-49343: ext4: avoid cycles in directory h-tree

Modified
AliasesUBUNTU-CVE-2022-49343DEBIAN-CVE-2022-49343
Published 26-02-2025Last modified 05-08-2026

Vulnerability summary

CVE-2022-49343 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 22% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.29%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 7
RHSA-2022:7683RHSA-2022:8267SUSE-SU-2025:1027-1SUSE-SU-2025:1176-1SUSE-SU-2025:1183-1SUSE-SU-2025:1194-1

Timeline

  1. 26-02-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid cycles in directory h-tree A maliciously corrupted filesystem can contain cycles in the h-tree stored inside a directory. That can easily lead to the kernel corrupting tree nodes that were already verified under its hands while doing a node split and consequently accessing unallocated memory. Fix the problem by verifying traversed block numbers are unique.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.29% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu111 products
  • linuxAll versions (No fix recorded) | < 4.4.0-242.276 | < 4.15.0-192.203 | < 5.4.0-126.142 | < 5.15.0-47.51
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1120.126 | < 4.4.0-1158.173 | < 4.15.0-1140.151 | < 5.4.0-1085.92 | < 5.15.0-1019.23
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < 24b8206fec1db21d7e82f21f0b2ff5e5672cf5b3 | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < b3ad9ff6f06c1dc6abf7437691c88ca3d6da3ac0 | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < e157c8f87e8fac112d6c955e69a60cdb9bc80a60 | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < ff4cafa51762da3824881a9000ca421d4b78b138 | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < 3a3ce941645407cd0b0b7f01ad9e2ea3770f46cc | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < d5a16a6df2c16eaf4de04948553ef0089dee463f | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < 6084240bfc44bf265ab6ae7d96980469b05be0f1 | ≥ ac27a0ec112a089f1a5102bc8dffc79c8c815571, < 3ba733f879c2a88910744647e41edeefbc0d92b2 | 2.6.19
  • linux_kernel< 4.14.283 | ≥ 4.15, < 4.19.247 | ≥ 4.20, < 5.4.198 | ≥ 5.5, < 5.10.121 | ≥ 5.11, < 5.15.46 | ≥ 5.16, < 5.17.14 | ≥ 5.18, < 5.18.3
Debian1 product
  • linux< 5.18.5-1

3 vendors · 114 products

References

12 links
Show all 12 references