CVE-2025-68251: erofs: avoid infinite loops due to corrupted subpage compact indexes

mediumCVSS 5.5CVE-2025-68251

CSIRTS triage

vendor: Linux product: erofs Denial of service

What: Infinite loops can occur when processing corrupted subpage compact indexes in the erofs filesystem.
Who is affected: Systems with erofs mounted with untrusted or corrupted filesystem images.
Urgency: Medium priority; malformed filesystem images can hang the system but require local or guest access.
Action: Apply kernel patch or disable erofs support if not required.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68251

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2025-682510.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-68251	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownDebian Linux Kernel Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in the Debian Linux kernel (June 26, 2026)cert-fr-avis
unknownDSA-6355-1 linux - security updatedebian

Recent advisories for erofs

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-45943: erofs: fix inline data read failure for ztailpacking pclustersmsrc · 2026-08-06
unknownCVE-2024-47736: erofs: handle overlapped pclusters out of crafted images properlymsrc · 2026-08-06
unknownCVE-2026-64146: In the Linux kernel, the following vulnerability has been resolved: erofs: fix metabuf leak in…nvd · 2026-07-19
highCVE-2026-64031: In the Linux kernel, the following vulnerability has been resolved: erofs: fix managed cache r…nvd · 2026-07-19
highCVE-2026-64146: erofs: fix metabuf leak in inode xattr initializationmsrc · 2026-07-14
mediumCVE-2026-53015: erofs: unify lcn as u64 for 32-bit platformsmsrc · 2026-06-09