CVE-2026-63872: esp: fix page frag reference leak on skb_to_sgvec failure

highCVSS 7.5CVE-2026-63872

CSIRTS triage

product: espOther

What: This vulnerability addresses a page frag reference leak on skb_to_sgvec failure.
Who is affected: Deployments using esp.
Urgency: Remediation is not urgent as there is no known exploitation.
Action: Apply the fix for CVE-2026-63872.

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 7.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63872

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-2026-638720.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-63872	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-63872: In the Linux kernel, the following vulnerability has been resolved: esp: fix page frag referen…nvd

Recent advisories for esp

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-2026-64009: In the Linux kernel, the following vulnerability has been resolved: xfrm: Check for underflow …nvd · 2026-07-19
criticalCVE-2026-63912: In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combine…nvd · 2026-07-19
highCVE-2026-63872: In the Linux kernel, the following vulnerability has been resolved: esp: fix page frag referen…nvd · 2026-07-19
unknownFragnesia Local Privilege Escalation report via ESP-in-TCP in the Linux Kernelaws · 2026-06-05