# CVE-2026-45899: ext4: drop extent cache when splitting extent fails

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

ext4: drop extent cache when splitting extent fails

When the split extent fails, we might leave some extents still being
processed and return an error directly, which will result in stale
extent entries remaining in the extent status tree. So drop all of the
remaining potentially stale extents if the splitting fails.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 6e54f8dfee359bbd58086c883ea8cffd5312999d (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 337506dc652383c80839edb8d8dcdd8ff2129b4f (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 2943bdbcdef6f74d4235ad0e57b225104dcad8ab (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < dc7c9b9d03a59a7fe483574531327e650a4b4adc (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 120c6bd7ca9d3e80a968b758cbb3fbd67570f132 (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 808f3191498f300174523c54cab101e18795ae4e (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 31bf37cf53ede8145e2bc62da803d4506da92975 (affected, git); ≥ 107a7bd31ac003e42c0f966aa8e5b26947de6024; < 79b592e8f1b435796cbc2722190368e3e8ffd7a1 (affected, git). Source: CNA: Linux
- Linux / Linux: 3.12 (affected); ≥ 0; < 3.12 (unaffected, semver); ≥ 5.10.253; ≤ 5.10.* (unaffected, semver); ≥ 5.15.203; ≤ 5.15.* (unaffected, semver); ≥ 6.1.191; ≤ 6.1.* (unaffected, semver); ≥ 6.6.130; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.27%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/6e54f8dfee359bbd58086c883ea8cffd5312999d (CNA: Linux)

- https://git.kernel.org/stable/c/337506dc652383c80839edb8d8dcdd8ff2129b4f (CNA: Linux)

- https://git.kernel.org/stable/c/2943bdbcdef6f74d4235ad0e57b225104dcad8ab (CNA: Linux)

- https://git.kernel.org/stable/c/dc7c9b9d03a59a7fe483574531327e650a4b4adc (CNA: Linux)

- https://git.kernel.org/stable/c/120c6bd7ca9d3e80a968b758cbb3fbd67570f132 (CNA: Linux)

- https://git.kernel.org/stable/c/808f3191498f300174523c54cab101e18795ae4e (CNA: Linux)

- https://git.kernel.org/stable/c/31bf37cf53ede8145e2bc62da803d4506da92975 (CNA: Linux)

- https://git.kernel.org/stable/c/79b592e8f1b435796cbc2722190368e3e8ffd7a1 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45899; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45899; retrieved 2026-11-06; source updated Not reported

Revision: 5eb28fa8b8db7ceffb9090a89bab92725637c453288419dde787a241bed3a906

Canonical: https://y2.dev/cve/CVE-2026-45899

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Collected public records only. Check source status for coverage and freshness.