CVE-2023-52760

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix slab-use-after-free in gfs2_qd_dealloc In gfs2_put_super(), whether withdrawn or not, the quota should be cleaned up by gfs2_quota_cleanup(). Otherwise, struct gfs2_sbd will be freed before gfs2_qd_dealloc (rcu callback) has run for all gfs2_quota_data objects, resulting in use-after-free. Also, gfs2_destroy_threads() and gfs2_quota_cleanup() is already called by gfs2_make_fs_ro(), so in gfs2_put_super(), after calling gfs2_make_fs_ro(), there is no need to call them again.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

• CWE-416•Use After Free

  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

• linux•linux

  ≥ f66af88e33212b57ea86da2c5d66c0d9d5c46344, < 08a28272faa750d4357ea2cb48d2baefd778ea81 | ≥ f66af88e33212b57ea86da2c5d66c0d9d5c46344, < bdcb8aa434c6d36b5c215d02a9ef07551be25a37 | 6.6

• linux•linux_kernel

  < 6.1.97 | ≥ 6.2, < 6.6.3

References (4)

• https://git.kernel.org/stable/c/08a28272faa750d4357ea2cb48d2baefd778ea81
• https://git.kernel.org/stable/c/bdcb8aa434c6d36b5c215d02a9ef07551be25a37
• https://git.kernel.org/stable/c/7ad4e0a4f61c57c3ca291ee010a9d677d0199fba
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html