In the Linux kernel, the following vulnerability has been resolved:
btrfs: harden block_group::bg_list against list_del() races
As far as I can tell, these calls of list_del_init() on bg_list cannot
run concurrently with btrfs_mark_bg_unused() or btrfs_mark_bg_to_reclaim(),
as they are in transaction error paths and situations where the block
group is readonly.
However, if there is any chance at all of racing with mark_bg_unused(),
or a different future user of bg_list, better to be safe than sorry.
Otherwise we risk the following interleaving (bg_list refcount in parens)
T1 (some random op) T2 (btrfs_mark_bg_unused)
!list_empty(&bg->bg_list); (1)
list_del_init(&bg->bg_list); (1)
list_move_tail (1)
btrfs_put_block_group (0)
btrfs_delete_unused_bgs
bg = list_first_entry
list_del_init(&bg->bg_list);
btrfs_put_block_group(bg); (-1)
Ultimately, this results in a broken ref count that hits zero one deref
early and the real final deref underflows the refcount, resulting in a WARNING.
References
Configurations
Configuration 1 (hide)
|
History
12 Nov 2025, 20:08
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | NVD-CWE-noinfo | |
| References | () https://git.kernel.org/stable/c/185fd73e5ac06027c4be9a129e59193f6a3ef202 - Patch | |
| References | () https://git.kernel.org/stable/c/7511e29cf1355b2c47d0effb39e463119913e2f6 - Patch | |
| References | () https://git.kernel.org/stable/c/909e60fb469d4101c6b08cf6e622efb062bb24a1 - Patch | |
| References | () https://git.kernel.org/stable/c/bf089c4d1141b27332c092b1dcca5022c415a3b6 - Patch |
Information
Published : 2025-05-09 07:16
Updated : 2025-11-12 20:08
NVD link : CVE-2025-37856
Mitre link : CVE-2025-37856
CVE.ORG link : CVE-2025-37856
JSON object : View
Products Affected
linux
- linux_kernel
CWE