5.5

CVE-2024-49957: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2024-49957DEBIAN-CVE-2024-49957
Published 21-10-2024Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2024-49957 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.25%
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 50 · Related 48
DLA-4008-1DLA-4075-1MGASA-2024-0344MGASA-2024-0345OPENSUSE-SU-2024:14500-1OPENSUSE-SU-2025:14705-1

Timeline

  1. 21-10-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix null-ptr-deref when journal load failed. During the mounting process, if journal_reset() fails because of too short journal, then lead to jbd2_journal_load() fails with NULL j_sb_buffer. Subsequently, ocfs2_journal_shutdown() calls jbd2_journal_flush()->jbd2_cleanup_journal_tail()-> __jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail() ->lock_buffer(journal->j_sb_buffer), resulting in a null-pointer dereference error. To resolve this issue, we should check the JBD2_LOADED flag to ensure the journal was properly loaded. Additionally, use journal instead of osb->journal directly to simplify the code.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.25% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.25%

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

Affected systems

Ubuntu134 products
  • linuxAll versions (No fix recorded) | < 5.4.0-208.228 | < 5.15.0-127.137 | < 6.8.0-54.56
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1140.150 | < 5.15.0-1073.79 | < 6.8.0-1023.25
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < fd89d92c1140cee8f59de336cb37fa65e359c123 | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < 703b2c7e0798d263154dc8593dc2345f75dc077f | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < bf605ae98dab5c15c5b631d4d7f88898cb41b649 | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < ff55291fb36779819211b596da703389135f5b05 | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < 82dfdd1e31e774578f76ce6dc90c834f96403a0f | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < 86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < f60e94a83db799bde625ac8671a5b4a6354e7120 | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < 387bf565cc03e2e8c720b8b4798efea4aacb6962 | ≥ f6f50e28f0cb8d7bcdfaacc83129f005dede11b1, < 5784d9fcfd43bd853654bb80c87ef293b9e8e80a | 2.6.32
  • linux_kernel≥ 2.6.32, < 5.10.227 | ≥ 5.11, < 5.15.168 | ≥ 5.16, < 6.1.113 | ≥ 6.2, < 6.6.55 | ≥ 6.7, < 6.10.14 | ≥ 6.11, < 6.11.3
Debian1 product
  • linux< 6.1.115-1 | < 6.11.4-1

3 vendors · 137 products

References

49 links
Show all 49 references