CVE-2026-52910: bpf: Free reuseport cBPF prog after RCU grace period.

highCVSS 7.8CVE-2026-52910

CSIRTS triage

product: bpfOther

What: This vulnerability involves improper handling of reuseport cBPF programs after RCU grace period.
Who is affected: Deployments using the affected bpf implementation.
Urgency: Remediation is urgent due to high severity and potential for exploitation.
Action: Apply the fix as soon as it is available.

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 7.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52910

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-2026-529100.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-52910	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 Microsoft Azure Linux (July 10, 2026)cert-fr-avis
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attackcert-bund
unknownDebian Linux Kernel Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in the Debian Linux kernel (June 26, 2026)cert-fr-avis
unknownDSA-6355-1 linux - security updatedebian

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.

mediumCVE-2026-53110: s390/bpf: Zero-extend bpf prog return values and kfunc argumentsmsrc · 2026-06-09
criticalCVE-2026-53089: bpf: Fix use-after-free in offloaded map/prog info fillmsrc · 2026-06-09
mediumCVE-2026-53076: bpf: Fix OOB in pcpu_init_valuemsrc · 2026-06-09
mediumCVE-2026-53096: bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB pathmsrc · 2026-06-09
mediumCVE-2026-53106: bpf: Do not allow deleting local storage in NMImsrc · 2026-06-09
mediumCVE-2026-53032: bpf: Fix NULL deref in map_kptr_match_type for scalar regsmsrc · 2026-06-09