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CVE-2023-54021: ext4: set goal start correctly in ext4_mb_normalize_request

Deferred
AliasesUBUNTU-CVE-2023-54021DEBIAN-CVE-2023-54021
Published 24-12-2025Last modified 11-05-2026

Vulnerability summary

CVE-2023-54021 is a low (CVSS 2.0) vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 2, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
2.0/10
010
Low · v4.0 (OSV · Ubuntu), selected by version preference
EPSS score
0.20%
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 6 · Related 5
RHSA-2024:2394SUSE-SU-2026:0263-1SUSE-SU-2026:0316-1SUSE-SU-2026:0317-1SUSE-SU-2026:0411-1SUSE-SU-2026:0617-1

Timeline

  1. 24-12-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: set goal start correctly in ext4_mb_normalize_request We need to set ac_g_ex to notify the goal start used in ext4_mb_find_by_goal. Set ac_g_ex instead of ac_f_ex in ext4_mb_normalize_request. Besides we should assure goal start is in range [first_data_block, blocks_count) as ext4_mb_initialize_context does. [ Added a check to make sure size is less than ar->pright; otherwise we could end up passing an underflowed value of ar->pright - size to ext4_get_group_no_and_offset(), which will trigger a BUG_ON later on. - TYT ]

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.20% 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.

Ubuntu125 products
  • linuxAll versions (No fix recorded) | < 5.4.0-162.179 | < 5.15.0-83.92
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1109.118 | < 5.15.0-1044.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.37-1 | < 6.3.7-1
Linux1 product
  • linux≥ c9de560ded61faa5b754137b7753da252391c55a, < 2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530 | ≥ c9de560ded61faa5b754137b7753da252391c55a, < 390eee955d4de4662db5e3e9e9a9eae020432cb7 | ≥ c9de560ded61faa5b754137b7753da252391c55a, < cee78217a7ae72d11c2e21e1a5263b8044489823 | ≥ c9de560ded61faa5b754137b7753da252391c55a, < 3ca3005b502ca8ea87d6a344323b179b48c4e4a3 | ≥ c9de560ded61faa5b754137b7753da252391c55a, < bc4a3e1d07a86ae5845321d371190244acacb2f2 | ≥ c9de560ded61faa5b754137b7753da252391c55a, < c6bee8970075b256fc1b07bf4873049219380818 | ≥ c9de560ded61faa5b754137b7753da252391c55a, < abb330ffaa3a0ae7ce632e28c9260b461c01f19f | ≥ c9de560ded61faa5b754137b7753da252391c55a, < b07ffe6927c75d99af534d685282ea188d9f71a6 | 2.6.25

3 vendors · 127 products

References

11 links
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