7.8

CVE-2024-26773: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()

Modified
AliasesUBUNTU-CVE-2024-26773DEBIAN-CVE-2024-26773
Published 03-04-2024Last modified 15-10-2026

Vulnerability summary

CVE-2024-26773 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 24.4% 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
0.31%
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 34 · Related 24
DLA-3840-1DLA-3842-1DSA-5681-1RHSA-2024:4823RHSA-2024:4831RHSA-2024:4928

Timeline

  1. 03-04-2024
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found() Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.31% 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.

Ubuntu117 products
  • linuxAll versions (No fix recorded) | < 5.4.0-186.206 | < 5.15.0-112.122
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1126.136 | < 5.15.0-1063.69
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < 21f8cfe79f776287459343e9cfa6055af61328ea | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < 260fc96283c0f594de18a1b045faf6d8fb42874d | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < 927794a02169778c9c2e7b25c768ab3ea8c1dc03 | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < 4c21fa60a6f4606f6214a38f50612b17b2f738f5 | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < f97e75fa4e12b0aa0224e83fcbda8853ac2adf36 | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < 0184747b552d6b5a14db3b7fcc3b792ce64dedd1 | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < a2576ae9a35c078e488f2c573e9e6821d651fbbe | ≥ 163a203ddb36c36d4a1c942aececda0cc8d06aa7, < 4530b3660d396a646aad91a787b6ab37cf604b53 | 3.12
  • linux_kernel< 4.19.308 | ≥ 4.20, < 5.4.270 | ≥ 5.5, < 5.10.211 | ≥ 5.11, < 5.15.150 | ≥ 5.16, < 6.1.80 | ≥ 6.2, < 6.6.19 | ≥ 6.7, < 6.7.7 | 6.8:rc1 | 6.8:rc2

3 vendors · 121 products

References

28 links
Show all 28 references