CVE-2026-45932: bpf: Fix tcx/netkit detach permissions when prog fd isn't given

highCVSS 7.3CVE-2026-45932

CSIRTS triage

product: Linux kernel (BPF/eBPF subsystem)Privilege escalation

What: Improper permission checking in BPF program detach operations (tcx/netkit) when file descriptor is not provided allows unauthorized program removal.
Who is affected: Linux systems with BPF/eBPF programs loaded and unprivileged user access.
Urgency: High; CVSS 7.3 indicates privilege escalation or denial-of-service risk via unprivileged BPF operations.
Action: Update to a patched Linux kernel version that enforces proper capability checks for BPF program detach operations.

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 7.3
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45932

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-2026-459320.13% 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-2026-45932	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund

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