In the Linux kernel, the following vulnerability has been resolved:
btrfs: reject invalid reloc tree root keys with stack dump
[BUG]
Syzbot reported a crash that an ASSERT() got triggered inside
prepare_to_merge().
That ASSERT() makes sure the reloc tree is properly pointed back by its
subvolume tree.
[CAUSE]
After more debugging output, it turns out we had an invalid reloc tree:
BTRFS error (device loop1): reloc tree mismatch, root 8 has no reloc root, expect reloc root key (-8, 132, 8) gen 17
Note the above root key is (TREE_RELOC_OBJECTID, ROOT_ITEM,
QUOTA_TREE_OBJECTID), meaning it's a reloc tree for quota tree.
But reloc trees can only exist for subvolumes, as for non-subvolume
trees, we just COW the involved tree block, no need to create a reloc
tree since those tree blocks won't be shared with other trees.
Only subvolumes tree can share tree blocks with other trees (thus they
have BTRFS_ROOT_SHAREABLE flag).
Thus this new debug output proves my previous assumption that corrupted
on-disk data can trigger that ASSERT().
[FIX]
Besides the dedicated fix and the graceful exit, also let tree-checker to
check such root keys, to make sure reloc trees can only exist for subvolumes.
References
Configurations
Configuration 1 (hide)
|
History
05 Feb 2026, 14:58
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | NVD-CWE-noinfo | |
| CPE | cpe:2.3:o:linux:linux_kernel:6.5:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.5:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.5:rc3:*:*:*:*:*:* |
|
| First Time |
Linux
Linux linux Kernel |
|
| References | () https://git.kernel.org/stable/c/314135b7bae9618a317874ae195272682cf2d5d4 - Patch | |
| References | () https://git.kernel.org/stable/c/3ae93b316ca4b8b3c33798ef1d210355f2fb9318 - Patch | |
| References | () https://git.kernel.org/stable/c/6ebcd021c92b8e4b904552e4d87283032100796d - Patch | |
| References | () https://git.kernel.org/stable/c/84256e00eeca73c529fc6196e478cc89b8098157 - Patch |
07 Oct 2025, 16:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-07 16:15
Updated : 2026-02-05 14:58
NVD link : CVE-2023-53618
Mitre link : CVE-2023-53618
CVE.ORG link : CVE-2023-53618
JSON object : View
Products Affected
linux
- linux_kernel
CWE