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Review reviewHigh

CVE-2022-50668

Linux

In the Linux kernel, the following vulnerability has been resolved: ext4: fix deadlock due to mbcache entry corruption When manipulating xattr blocks, we can deadlock infinitely looping inside ext4_xattr_block_set() where we constantly keep finding xattr block for reuse in mbcache but we are unable to reuse it because its reference count is too big. This happens because cache entry for the xattr block is marked as reusable (e_reusable set) although its reference count is too big. When this inconsistency happens, this inconsistent state is kept indefinitely and so ext4_xattr_block_set() keep...

CVSS
7.5
EPSS
0.72%
50.4% percentile
CISA KEV
Not listed
Published
2025.12.10
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.72%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ext4: fix deadlock due to mbcache entry corruption When manipulating xattr blocks, we can deadlock infinitely looping inside ext4_xattr_block_set() where we constantly keep finding xattr block for reuse in mbcache but we are unable to reuse it because its reference count is too big. This happens because cache entry for the xattr block is marked as reusable (e_reusable set) although its reference count is too big. When this inconsistency happens, this inconsistent state is kept indefinitely and so ext4_xattr_block_set() keep...

Affected product and versions

Product
Linux
Affected versions
>= 6048c64b26097a0ffbd966866b599f990e674e9b < efaa0ca678f56d47316a08030b2515678cebbc50, >= 6048c64b26097a0ffbd966866b599f990e674e9b < af53065276376750dfac35a7248af18806404c5d, >= 6048c64b26097a0ffbd966866b599f990e674e9b < 1be16a0c2f10186df505e28b0cc92d7f3366e2a8, >= 6048c64b26097a0ffbd966866b599f990e674e9b < 5bc0b2fda4b47c86278f7c6d30c211f425bf51cf, >= 6048c64b26097a0ffbd966866b599f990e674e9b < 127b80cefb941a81255c72f11081123f3a705369, >= 6048c64b26097a0ffbd966866b599f990e674e9b < cc1538c693d25e282bed8c54b65c914a04023a78, >= 6048c64b26097a0ffbd966866b599f990e674e9b < a44e84a9b7764c72896f7241a0ec9ac7e7ef38dd, >= 4.6
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available
CVE-2022-50668 — Linux | SECUFOCUS NOW