CVE-2024-46840
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…
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.26% probability · 18th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS 0.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://git.kernel.org/stable/c/03804641ec2d0da4fa088ad21c88e703d151ce16Patch
- https://git.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645ePatch
- https://git.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32Patch
- https://git.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9Patch
- https://git.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75bPatch
- https://git.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3Patch
- https://git.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029cPatch
- https://git.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627dPatch
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.