CVE-2024-35936: btrfs: handle chunk tree lookup error in btrfs_relocate_sys_chunks()

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: 2024-05-19 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: handle chunk tree lookup error in btrfs_relocate_sys_chunks() The unhandled case in btrfs_relocate_sys_chunks() loop is a corruption, as it could be caused only by two impossible conditions: - at first the search key is set up to look for a chunk tree item, with offset -1, this is an inexact search and the key->offset will contain the correct offset upon a successful search, a valid chunk tree item cannot have an offset -1 - after first successful search, the found_key corresponds to a chunk item, the offset is decremented by 1 before the next loop, it's impossible to find a chunk item there due to alignment and size constraints

Affected products

Debian Linux: 10.0
Linux kernel: before 4.19.312; from 4.20 before 5.4.274; from 5.5 before 5.10.215; from 5.11 before 5.15.155; from 5.16 before 6.1.86; from 6.2 before 6.6.27 — fixed in 4.19.312, 5.10.215, 5.15.155, 5.4.274, 6.1.86, 6.6.27

How to fix

Upgrade to a fixed version: Linux kernel 4.19.312, 5.10.215, 5.15.155, 5.4.274. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-35936 or the next vulnerability affects your stack