CVE-2026-72423: bpf: Guard conntrack opts error writes

mediumCVSS 6CVE-2026-72423

CSIRTS triage

product: bpf Code injection

What: BPF engine guards writes to conntrack options error paths to prevent unsafe memory access.
Who is affected: Linux systems with BPF conntrack offloading enabled.
Urgency: Medium urgency; unguarded error writes could lead to memory corruption via BPF programs.
Action: Apply kernel patch that guards conntrack options error writes.

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: medium — CVSS 6
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72423

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-2026-724230.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-72423	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-72423: In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts …nvd

Recent advisories for bpf

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-2026-74720: In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve pointer stat…nvd · 2026-08-22
highCVE-2026-74715: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix netns reference i…nvd · 2026-08-22
highCVE-2026-74714: In the Linux kernel, the following vulnerability has been resolved: bpf: tcp: Fix use-after-fr…nvd · 2026-08-22
highCVE-2026-74590: In the Linux kernel, the following vulnerability has been resolved: fsverity: Fix bpf_get_fsve…nvd · 2026-08-22
highCVE-2026-74589: In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix sk_redir…nvd · 2026-08-22
unknownCVE-2026-74400: In the Linux kernel, the following vulnerability has been resolved: bpf: fix crash in bpf_[set…nvd · 2026-08-15