CVE-2024-40951

MEDIUM EPSS 14.8%
Published Jul 12, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jul 12, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger() bdev->bd_super has been removed and commit 8887b94d9322 change the usage from bdev->bd_super to b_assoc_map->host->i_sb. Since ocfs2 hasn't set bh->b_assoc_map, it will trigger NULL pointer dereference when calling into ocfs2_abort_trigger(). Actually this was pointed out in history, see commit 74e364ad1b13. But I've made a mistake when reviewing commit 8887b94d9322 and then re-introduce this regression. Since we cannot revive bdev in buffer head, so fix this issue by initializing all types of ocfs2 triggers when fill super, and then get the specific ocfs2 trigger from ocfs2_caching_info when access journal. [joseph.qi@linux.alibaba.com: v2]

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
14.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥6.6  –  <6.6.36
linuxlinux_kernel*≥6.7  –  <6.9.7
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/67bcecd780609f471260a8c83fb0ae15f27734ce
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1a
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/67bcecd780609f471260a8c83fb0ae15f27734ce
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1a
    Patch