CVE-2026-52935: xfrm: espintcp: do not reuse an in-progress partial send

highCVSS 7.8CVE-2026-52935

CSIRTS triage

Other

What: This vulnerability prevents the reuse of an in-progress partial send in the xfrm espintcp module.
Who is affected: Deployments using the xfrm espintcp module are affected.
Urgency: Remediation is high urgency due to a severity rating of 7.8.
Action: Apply the patch for CVE-2026-52935.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52935

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-2026-529350.12% 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-2026-52935	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund

Recent advisories for xfrm

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.

unknownCVE-2026-53363: In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: preserve shar…nvd · 2026-07-10
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