CVE-2024-49957: ocfs2: fix null-ptr-deref when journal load failed.
First published: Mon Oct 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=2.6.32<5.10.227 | |
| Linux kernel | >=5.11<5.15.168 | |
| Linux kernel | >=5.16<6.1.113 | |
| Linux kernel | >=6.2<6.6.55 | |
| Linux kernel | >=6.7<6.10.14 | |
| Linux kernel | >=6.11<6.11.3 | |
| Linux Kernel | >=2.6.32<5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/387bf565cc03e2e8c720b8b4798efea4aacb6962
- https://git.kernel.org/stable/c/5784d9fcfd43bd853654bb80c87ef293b9e8e80a
- https://git.kernel.org/stable/c/703b2c7e0798d263154dc8593dc2345f75dc077f
- https://git.kernel.org/stable/c/82dfdd1e31e774578f76ce6dc90c834f96403a0f
- https://git.kernel.org/stable/c/86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b
- https://git.kernel.org/stable/c/bf605ae98dab5c15c5b631d4d7f88898cb41b649
- https://git.kernel.org/stable/c/f60e94a83db799bde625ac8671a5b4a6354e7120
- https://git.kernel.org/stable/c/fd89d92c1140cee8f59de336cb37fa65e359c123
- https://git.kernel.org/stable/c/ff55291fb36779819211b596da703389135f5b05
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49957
- https://nvd.nist.gov/vuln/detail/CVE-2024-49957
- https://launchpad.net/bugs/cve/CVE-2024-49957
- https://security-tracker.debian.org/tracker/CVE-2024-49957
- https://ubuntu.com/security/CVE-2024-49957
- https://git.kernel.org/linus/5784d9fcfd43bd853654bb80c87ef293b9e8e80a
Frequently Asked Questions
What is the severity of CVE-2024-49957?
CVE-2024-49957 has a moderate severity rating due to the potential for a null pointer dereference.
How do I fix CVE-2024-49957?
To fix CVE-2024-49957, update your Linux kernel to version 6.1.123-1, 6.1.119-1, or any later version that addresses the vulnerability.
What systems are affected by CVE-2024-49957?
CVE-2024-49957 affects various versions of the Linux kernel including versions between 2.6.32 and 6.10.14.
What is the impact of CVE-2024-49957?
The impact of CVE-2024-49957 includes potential system crashes due to null pointer dereferences during journal loading.
Does CVE-2024-49957 require user interaction to exploit?
CVE-2024-49957 does not require user interaction to exploit, as it can occur automatically during the mounting process.
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