CVE-2024-49957
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix null-ptr-deref when journal load failed.
Does this matter?
Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/387bf565cc03e2e8c720b8b4798efea4aacb6962Patch
- https://git.kernel.org/stable/c/5784d9fcfd43bd853654bb80c87ef293b9e8e80aPatch
- https://git.kernel.org/stable/c/703b2c7e0798d263154dc8593dc2345f75dc077f
- https://git.kernel.org/stable/c/82dfdd1e31e774578f76ce6dc90c834f96403a0fPatch
- https://git.kernel.org/stable/c/86a89e75e9e4dfa768b97db466ad6bedf2e7ea5bPatch
- https://git.kernel.org/stable/c/bf605ae98dab5c15c5b631d4d7f88898cb41b649Patch
- https://git.kernel.org/stable/c/f60e94a83db799bde625ac8671a5b4a6354e7120Patch
- https://git.kernel.org/stable/c/fd89d92c1140cee8f59de336cb37fa65e359c123
- https://git.kernel.org/stable/c/ff55291fb36779819211b596da703389135f5b05Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.