Answer in brief
CVE-2022-50668 records a High severity (CVSS 7.5) vulnerability in ext4: fix deadlock due to mbcache entry corruption. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6048c64b26097a0ffbd966866b599f990e674e9b <efaa0ca678f56d47316a08030b2515678cebbc50 || >=6048c64b26097a0ffbd966866b599f990e674e9b <af53065276376750dfac35a7248af18806404c5d || >=6048c64b26097a0ffbd966866b599f990e674e9b <1be16a0c2f10186df505e28b0cc92d7f3366e2a8 || >=6048c64b26097a0ffbd966866b599f990e674e9b <5bc0b2fda4b47c86278f7c6d30c211f425bf51cf || >=6048c64b26097a0ffbd966866b599f990e674e9b <127b80cefb941a81255c72f11081123f3a705369 || >=6048c64b26097a0ffbd966866b599f990e674e9b <cc1538c693d25e282bed8c54b65c914a04023a78 || >=6048c64b26097a0ffbd966866b599f990e674e9b <a44e84a9b7764c72896f7241a0ec9ac7e7ef38dd | efaa0ca678f56d47316a08030b2515678cebbc50, af53065276376750dfac35a7248af18806404c5d, 1be16a0c2f10186df505e28b0cc92d7f3366e2a8, 5bc0b2fda4b47c86278f7c6d30c211f425bf51cf, 127b80cefb941a81255c72f11081123f3a705369, cc1538c693d25e282bed8c54b65c914a04023a78, a44e84a9b7764c72896f7241a0ec9ac7e7ef38dd |
| Linux/Linuxgeneric | 4.6 | Not reported |
Published upstream
Dec 9, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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() keeps retrying indefinitely. The inconsistent state is caused by non-atomic update of e_reusable bit. e_reusable is part of a bitfield and e_reusable update can race with update of e_referenced bit in the same bitfield resulting in loss of one of the updates. Fix the problem by using atomic bitops instead. This bug has been around for many years, but it became *much* easier to hit after commit 65f8b80053a1 ("ext4: fix race when reusing xattr blocks").
Quoted source text, attributed separately from HOL analysis.