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CVE-2026-89576

UnknownEPSS 0.20%

Last modified

CVE-2026-89576 is a vulnerability of currently unknown severity. 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().. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

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().

Metrics

EPSS Probability
0.20%

9.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= eec40579d84873dfb7021eb24c50360f073237c5, < 54dd21ca945ecc07885012b9f3e8197f091cfba0; >= eec40579d84873dfb7021eb24c50360f073237c5, < ef00efb6fcaee88f50891279ceced17c614e97f7; >= eec40579d84873dfb7021eb24c50360f073237c5, < e9fa68b89214bc65af0ef963af7ec3cce9f866e0; >= eec40579d84873dfb7021eb24c50360f073237c5, < dc731d7fddfd6149f5e88ea080475d18c36d3c64; >= eec40579d84873dfb7021eb24c50360f073237c5, < d66ceeefb87ddb097b0546bafc581380b816b048; >= eec40579d84873dfb7021eb24c50360f073237c5, < 36ff918637e3517f732188a3c39dbeae5b9cfb1b; >= eec40579d84873dfb7021eb24c50360f073237c5, < 6876ca330e741fb8886d12070cb6a7f9cb67257e; >= eec40579d84873dfb7021eb24c50360f073237c5, < 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713
LinuxLinux3.15

References

Timeline

Published
Last Modified
Status
Received

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 severe is CVE-2026-89576?
Severity scoring for CVE-2026-89576 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89576?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST