UNKNOWN NVD
CVE-2026-89576
In the Linux kernel, the following vulnerability has been resolved: dm-era: fix shadowed superblock leak on take-snap failure metadata_take_snap() bumps the l
In the Linux kernel, the following vulnerability has been resolved:
dm-era: fix shadowed superblock leak on take-snap failure
metadata_take_snap() bumps the live superblock refcount and then
dm_tm_shadow_block() allocates a new block for the metadata snapshot.
If the subsequent dm_sm_inc_block() of writeset_tree_root or
era_array_root fails, the function only unlocks the clone and
returns. The newly allocated shadow block is never returned to the
metadata space map, so each failed take-snap permanently leaks one
metadata block.
Free the clone with dm_sm_dec_block() on those error paths, matching
the final step of metadata_drop_snap().
References
- https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b
- https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713
- https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e
- https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048
This unknown severity vulnerability was published on 2026-09-11 via NVD.
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