# CVE-2026-31451: ext4: replace BUG_ON with proper error handling in ext4_read_inline_folio

Status: published. Published: 2026-04-22. Updated: 2026-11-05.

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

ext4: replace BUG_ON with proper error handling in ext4_read_inline_folio

Replace BUG_ON() with proper error handling when inline data size
exceeds PAGE_SIZE. This prevents kernel panic and allows the system to
continue running while properly reporting the filesystem corruption.

The error is logged via ext4_error_inode(), the buffer head is released
to prevent memory leak, and -EFSCORRUPTED is returned to indicate
filesystem corruption.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < 3462a3f0716d27af51896dc8688bcf0628fb17ee (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < 636e8d85a36ab6c31aafd04ee66a69b18eebee7b (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < af25a6affeac4919e8d8c5cccc01a9d53478447e (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < 65c6c30ce6362c1c684568744ea510c921a756cd (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < d4b3f370c3d8f7ce565d4a718572c9f7c12f77ed (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < 823849a26af089ffc5dfdd2ae4b9d446b46a0cda (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < a7d600e04732a7d29b107c91fe3aec64cf6ce7f2 (affected, git); ≥ 46c7f254543dedcf134ad05091ed2b935a9a597d; < 356227096eb66e41b23caf7045e6304877322edf (affected, git). Source: CNA: Linux
- Linux / Linux: 3.8 (affected); ≥ 0; < 3.8 (unaffected, semver); ≥ 5.10.260; ≤ 5.10.* (unaffected, semver); ≥ 5.15.211; ≤ 5.15.* (unaffected, semver); ≥ 6.1.177; ≤ 6.1.* (unaffected, semver); ≥ 6.6.131; ≤ 6.6.* (unaffected, semver); ≥ 6.12.80; ≤ 6.12.* (unaffected, semver); ≥ 6.18.21; ≤ 6.18.* (unaffected, semver); ≥ 6.19.11; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: ≥ 0; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-05; percentile 2.51%

- 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/3462a3f0716d27af51896dc8688bcf0628fb17ee (CNA: Linux)

- https://git.kernel.org/stable/c/636e8d85a36ab6c31aafd04ee66a69b18eebee7b (CNA: Linux)

- https://git.kernel.org/stable/c/af25a6affeac4919e8d8c5cccc01a9d53478447e (CNA: Linux)

- https://git.kernel.org/stable/c/65c6c30ce6362c1c684568744ea510c921a756cd (CNA: Linux)

- https://git.kernel.org/stable/c/d4b3f370c3d8f7ce565d4a718572c9f7c12f77ed (CNA: Linux)

- https://git.kernel.org/stable/c/823849a26af089ffc5dfdd2ae4b9d446b46a0cda (CNA: Linux)

- https://git.kernel.org/stable/c/a7d600e04732a7d29b107c91fe3aec64cf6ce7f2 (CNA: Linux)

- https://git.kernel.org/stable/c/356227096eb66e41b23caf7045e6304877322edf (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-31451; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-31451; retrieved 2026-11-05; source updated Not reported

Revision: 8d019086ffbbb873fc2652193f0b9ef3ae058833faac1d3e98467025c0800238

Canonical: https://y2.dev/cve/CVE-2026-31451

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