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In the Linux kernel, the following vulnerability has been resolved:
btrfs: exit gracefully if reloc roots don't match
[BUG]
Syzbot reported a crash that an ASSERT() got triggered inside
prepare_to_merge().
[CAUSE]
The root cause of the triggered ASSERT() is we can have a race between
quota tree creation and relocation.
This leads us to create a duplicated quota tree in the
btrfs_read_fs_root() path, and since it's treated as fs tree, it would
have ROOT_SHAREABLE flag, causing us to create a reloc tree for it.
The bug itself is fixed by a dedicated patch for it, but this already
taught us the ASSERT() is not something straightforward for
developers.
[ENHANCEMENT]
Instead of using an ASSERT(), let's handle it gracefully and output
extra info about the mismatch reloc roots to help debug.
Also with the above ASSERT() removed, we can trigger ASSERT(0)s inside
merge_reloc_roots() later.
Also replace those ASSERT(0)s with WARN_ON()s.
Metrics
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In the Linux kernel, the following vulnerability has been resolved:
btrfs: exit gracefully if reloc roots don't match
[BUG]
Syzbot reported a crash that an ASSERT() got triggered inside
prepare_to_merge().
[CAUSE]
The root cause of the triggered ASSERT() is we can have a race between
quota tree creation and relocation.
This leads us to create a duplicated quota tree in the
btrfs_read_fs_root() path, and since it's treated as fs tree, it would
have ROOT_SHAREABLE flag, causing us to create a reloc tree for it.
The bug itself is fixed by a dedicated patch for it, but this already
taught us the ASSERT() is not something straightforward for
developers.
[ENHANCEMENT]
Instead of using an ASSERT(), let's handle it gracefully and output
extra info about the mismatch reloc roots to help debug.
Also with the above ASSERT() removed, we can trigger ASSERT(0)s inside
merge_reloc_roots() later.
Also replace those ASSERT(0)s with WARN_ON()s.
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Removed
CVSS V3.1
NIST: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Removed
CWE
NIST: CWE-617
Removed
CPE Configuration
OR
*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:*:*:*:*:*:*
*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:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.4.11
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.46
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.15.127
OR
*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:*:*:*:*:*:*
*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:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.4.11
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.15.127
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.46
New CVE Received from kernel.org9/15/2025 10:15:40 AM
Action
Type
Old Value
New Value
Added
Description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: exit gracefully if reloc roots don't match
[BUG]
Syzbot reported a crash that an ASSERT() got triggered inside
prepare_to_merge().
[CAUSE]
The root cause of the triggered ASSERT() is we can have a race between
quota tree creation and relocation.
This leads us to create a duplicated quota tree in the
btrfs_read_fs_root() path, and since it's treated as fs tree, it would
have ROOT_SHAREABLE flag, causing us to create a reloc tree for it.
The bug itself is fixed by a dedicated patch for it, but this already
taught us the ASSERT() is not something straightforward for
developers.
[ENHANCEMENT]
Instead of using an ASSERT(), let's handle it gracefully and output
extra info about the mismatch reloc roots to help debug.
Also with the above ASSERT() removed, we can trigger ASSERT(0)s inside
merge_reloc_roots() later.
Also replace those ASSERT(0)s with WARN_ON()s.
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