Updated: 2026-02-27 02:14:14.460807
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.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | MEDIUM | 5.5 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| AlmaLinux 9.2 ESU | kernel | 5.14.0 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:40 | This issue is confined to the Btrfs filesystem’s snapshot-deletion path and is reachable only loca... | |
| CentOS 6 ELS | kernel | 2.6.32 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:41 | Ignored due to low severity | |
| CentOS 7 ELS | kernel | 3.10.0 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:38 | Ignored due to low severity | |
| CentOS 8.4 ELS | kernel | 4.18.0 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:38 | Ignored due to low severity | |
| CentOS 8.5 ELS | kernel | 4.18.0 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:39 | Ignored due to low severity | |
| CentOS Stream 8 ELS | kernel | 4.18.0 | 5.5 | MEDIUM | Not Vulnerable | 2024-10-16 05:26:05 | Not affected: CVE-2024-46840 is confined to the Btrfs snapshot-deletion path in fs/btrfs/extent-tree... | |
| CloudLinux 6 ELS | kernel | 2.6.32 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:41 | Ignored due to low severity | |
| CloudLinux 7 ELS | kernel | 3.10.0 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:35 | Ignored due to low severity | |
| Oracle Linux 6 ELS | kernel | 2.6.32 | 5.5 | MEDIUM | Ignored | 2024-10-16 23:52:38 | Ignored due to low severity | |
| Oracle Linux 7 ELS | kernel | 3.10.0 | 5.5 | MEDIUM | Ignored | 2024-12-03 12:09:15 | Ignored due to low severity |