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().

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EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713 https://git.kernel.org/stable/c/54dd21ca945ecc07885012b9f3e8197f091cfba0 https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048 https://git.kernel.org/stable/c/dc731d7fddfd6149f5e88ea080475d18c36d3c64 https://git.kernel.org/stable/c/e9fa68b89214bc65af0ef963af7ec3cce9f866e0 https://git.kernel.org/stable/c/ef00efb6fcaee88f50891279ceced17c614e97f7

Frequently Asked Questions

What is 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 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 do I check if I'm vulnerable to CVE-2026-89576? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.