CVE-2024-46840: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: btrfs: clean up our handling of refs == 0 in snapshot delete In reada we BUG_ON(refs == 0), which could be unkind since we aren't holding a lock on the extent leaf and thus could get a transient incorrect answer. In walk_down_proc we also BUG_ON(refs == 0), which could happen if we have extent tree corruption. Change that to return -EUCLEAN. In do_walk_down() we catch this case and handle it correctly, however we return -EIO, which -EUCLEAN is a more appropriate error code. Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert that to proper error handling. Also adjust the error message so we can actually do something with the information.

Affected products

• Linux Linux Kernel: before 4.19.322 (fixed in 4.19.322); from 4.20, before 5.4.284 (fixed in 5.4.284); from 5.5, before 5.10.226 (fixed in 5.10.226); from 5.11, before 5.15.167 (fixed in 5.15.167); from 5.16, before 6.1.110 (fixed in 6.1.110); from 6.2, before 6.6.51 (fixed in 6.6.51); …

Published 2024-09-27. Last modified 2026-06-17.