CVE-2026-64436: net: af_key: initialize alg_key_len for IPComp states

highCVSS 7.1CVE-2026-64436

CSIRTS triage

vendor: Linux product: KernelOther

What: The alg_key_len for IPComp states is not properly initialized, leading to potential issues.
Who is affected: Deployments of the Linux kernel using IPComp.
Urgency: Remediation is recommended to avoid potential instability, with no known exploits at this time.
Action: Update to the latest kernel version that includes the fix.

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-2026-64436

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-2026-644360.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64436	coverage & exploitation status	NVD · CVE.org

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