CVE-2026-64360: hfs/hfsplus: zero-initialize buffer in hfs_bnode_read

mediumCVSS 5.5CVE-2026-64360

CSIRTS triage

vendor: null product: nullOther

What: There is a zero-initialize buffer issue in the hfs_bnode_read function of the hfs/hfsplus driver.
Who is affected: Deployments using the hfs/hfsplus driver are affected.
Urgency: Remediation urgency is unclear due to unknown severity and no exploitation reported.
Action: Monitor for updates regarding this issue.

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: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64360

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-2026-643600.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64360	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownCVE-2026-64360: In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: zero-initiali…nvd

Recent advisories for hfs/hfsplus

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.

highCVE-2026-64361: In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: fix u32 overf…nvd · 2026-07-25
unknownCVE-2026-64360: In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: zero-initiali…nvd · 2026-07-25
highCVE-2026-64361: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_lengthmsrc · 2026-07-14