CVE-2026-89576
Description
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().
How to fix
- Linux Linux54dd21ca945ecc07885012b9f3e8197f091cfba0, ef00efb6fcaee88f50891279ceced17c614e97f7, e9fa68b89214bc65af0ef963af7ec3cce9f866e0, dc731d7fddfd6149f5e88ea080475d18c36d3c64, d66ceeefb87ddb097b0546bafc581380b816b048, 36ff918637e3517f732188a3c39dbeae5b9cfb1b, 6876ca330e741fb8886d12070cb6a7f9cb67257e, 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < 54dd21ca945ecc07885012b9f3e8197f091cfba0, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < ef00efb6fcaee88f50891279ceced17c614e97f7, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < e9fa68b89214bc65af0ef963af7ec3cce9f866e0, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < dc731d7fddfd6149f5e88ea080475d18c36d3c64, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < d66ceeefb87ddb097b0546bafc581380b816b048, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < 36ff918637e3517f732188a3c39dbeae5b9cfb1b, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < 6876ca330e741fb8886d12070cb6a7f9cb67257e, eec40579d84873dfb7021eb24c50360f073237c5 ≤ v < 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713, 3.15 | 54dd21ca945ecc07885012b9f3e8197f091cfba0, ef00efb6fcaee88f50891279ceced17c614e97f7, e9fa68b89214bc65af0ef963af7ec3cce9f866e0, dc731d7fddfd6149f5e88ea080475d18c36d3c64, d66ceeefb87ddb097b0546bafc581380b816b048, 36ff918637e3517f732188a3c39dbeae5b9cfb1b, 6876ca330e741fb8886d12070cb6a7f9cb67257e, 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713 |
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