CVE-2023-52566: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-02 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page. NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly. [konishi.ryusuke@gmail.com: NOTE added to the commit log]

Affected products

Linux kernel: from 2.6.30 before 4.14.327; from 4.15 before 4.19.296; from 4.20 before 5.4.258; from 5.5 before 5.10.198; from 5.11 before 5.15.134; from 5.16 before 6.1.56 — fixed in 4.14.327, 4.19.296, 5.10.198, 5.15.134, 5.4.258, 6.1.56

How to fix

Upgrade to a fixed version: Linux kernel 4.14.327, 4.19.296, 5.10.198, 5.15.134. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-52566 or the next vulnerability affects your stack