CVE-2026-74257: sockmap: Fix use-after-free in udp_bpf_recvmsg()

highCVSS 7CVE-2026-74257

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: Use-after-free vulnerability in sockmap UDP BPF hook recvmsg function.
Who is affected: Linux systems with BPF sockmap UDP functionality enabled are affected.
Urgency: High; use-after-free can lead to code execution and CVSS 7 rating indicates significant risk.
Action: Apply kernel patch CVE-2026-74257 or disable BPF sockmap UDP hooks until patched.

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

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74257

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-2026-742570.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74257	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-74257: In the Linux kernel, the following vulnerability has been resolved: sockmap: Fix use-after-fre…nvd

Recent advisories for sockmap

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-2026-74589: In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix sk_redir…nvd · 2026-08-22
highCVE-2026-74257: In the Linux kernel, the following vulnerability has been resolved: sockmap: Fix use-after-fre…nvd · 2026-08-15
highCVE-2026-74256: In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: fix integer …nvd · 2026-08-15
mediumCVE-2026-74589: bpf, sockmap: Fix sk_redir use-after-free in send verdictmsrc · 2026-08-11
mediumCVE-2026-68386: bpf, sockmap: Reject unhashed UDP sockets on sockmap updatemsrc · 2026-08-11
highCVE-2026-68284: bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()msrc · 2026-08-11