CVE-2026-64577: gtp: check skb_pull_data() return in gtp1u_send_echo_resp()

highCVSS 7.5CVE-2026-64577

CSIRTS triage

product: Linux kernel (gtp module)Denial of service

What: Missing return value check on skb_pull_data() in gtp1u_send_echo_resp() can cause buffer overread and kernel panic.
Who is affected: Systems with GTP module enabled handling GTP echo requests with malformed packets.
Urgency: High urgency; kernel panic from malformed network packets can be triggered remotely by network adversaries.
Action: Apply Linux kernel patch adding return value check in gtp1u_send_echo_resp() function immediately.

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: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64577

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-2026-645770.54% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64577	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiple vulnerabilities in Debian Linux kernel (August 14, 2026)cert-fr-avis
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownDSA-6415-1 linux - security updatedebian
highCVE-2026-64577: In the Linux kernel, the following vulnerability has been resolved: gtp: check skb_pull_data()…nvd

Recent advisories for gtp

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-2026-64577: In the Linux kernel, the following vulnerability has been resolved: gtp: check skb_pull_data()…nvd · 2026-08-05