CVE-2026-74603: ptp: ocp: Fix board ID over-read

lowCVSS 3.3CVE-2026-74603

CSIRTS triage

vendor: Linux product: Linux kernel Information disclosure

What: PTP OCP board ID field read exceeds allocated buffer, leaking adjacent kernel memory.
Who is affected: Systems with PTP Oscillator Clock Processor hardware running vulnerable Linux kernel versions.
Urgency: Low priority; limited exposure to systems with specific hardware.
Action: Apply kernel security update addressing CVE-2026-74603 when available.

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: low — CVSS 3.3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74603

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-2026-746030.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74603	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for ptp

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-2026-74603: In the Linux kernel, the following vulnerability has been resolved: ptp: ocp: Fix board ID ove…nvd · 2026-08-22
mediumCVE-2026-12632: Zephyr's Precision Time Protocol receive handler ptp_msg_post_recv() in subsys/net/lib/ptp/msg…nvd · 2026-08-18
unknownCVE-2026-72414: In the Linux kernel, the following vulnerability has been resolved: net: dsa: sja1105: round u…nvd · 2026-08-15
highCVE-2026-68134: In the Linux kernel, the following vulnerability has been resolved: ptp: ptp_s390: Add missing…nvd · 2026-08-10
unknownCVE-2026-68133: In the Linux kernel, the following vulnerability has been resolved: ice: fix PTP Call Trace du…nvd · 2026-08-10
highCVE-2025-40057: ptp: Add a upper bound on max_vclocksmsrc · 2026-08-06