CVE-2026-64146: erofs: fix metabuf leak in inode xattr initialization

highCVSS 7.1CVE-2026-64146

CSIRTS triage

product: erofsOther

What: A metabuf leak in inode xattr initialization has been fixed.
Who is affected: Deployments using the erofs filesystem.
Urgency: Remediation is high urgency due to the potential for information leakage.
Action: Apply the latest updates for erofs.

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: high — CVSS 7.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64146

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-2026-641460.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64146	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownUSN-8664-1: Linux kernel (NVIDIA BaseOS) vulnerabilitiesubuntu
unknownUSN-8663-1: Linux kernel (NVIDIA) vulnerabilitiesubuntu
highUSN-8618-1: Linux kernel vulnerabilitiesubuntu
highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
highUSN-8593-1: Linux kernel vulnerabilitiesubuntu
unknownCVE-2026-64146: In the Linux kernel, the following vulnerability has been resolved: erofs: fix metabuf leak in…nvd

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
mediumCVE-2025-68251: erofs: avoid infinite loops due to corrupted subpage compact indexesmsrc · 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
mediumCVE-2026-53015: erofs: unify lcn as u64 for 32-bit platformsmsrc · 2026-06-09