7.8

CVE-2024-26601: ext4: regenerate buddy after block freeing failed if under fc replay

Modified
AliasesUBUNTU-CVE-2024-26601DEBIAN-CVE-2024-26601
Published 24-02-2024Last modified 05-08-2026

Vulnerability summary

CVE-2024-26601 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.8% 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 31 · Related 25
DLA-3842-1DSA-5681-1RHSA-2024:10771RHSA-2024:5066RHSA-2024:5067RHSA-2024:9315

Timeline

  1. 24-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: regenerate buddy after block freeing failed if under fc replay This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks(), fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.

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, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu104 products
  • linux< 5.15.0-112.122
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1063.69
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0983142c5f17a62055ec851372273c3bc77e4788, < 94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a | ≥ 6bd97bf273bdb4944904e57480f6545bca48ad77, < c1317822e2de80e78f137d3a2d99febab1b80326 | ≥ 6bd97bf273bdb4944904e57480f6545bca48ad77, < 78327acd4cdc4a1601af718b781eece577b6b7d4 | ≥ 6bd97bf273bdb4944904e57480f6545bca48ad77, < ea42d6cffb0dd27a417f410b9d0011e9859328cb | ≥ 6bd97bf273bdb4944904e57480f6545bca48ad77, < 6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 | ≥ 6bd97bf273bdb4944904e57480f6545bca48ad77, < c9b528c35795b711331ed36dc3dbee90d5812d4e | ≥ 5.10.181, < 5.10.211 | 5.11
  • linux_kernel< 5.10.211 | ≥ 5.11.0, < 5.15.150 | ≥ 5.16.0, < 6.1.78 | ≥ 6.2.0, < 6.6.17 | ≥ 6.7.0, < 6.7.5
Debian1 product
  • linux< 6.1.82-1 | < 6.7.7-1

3 vendors · 107 products

References

27 links
Show all 27 references