CVE-2025-37807: bpf: Fix kmemleak warning for percpu hashmap

highCVSS 7CVE-2025-37807

CSIRTS triage

vendor: Linux product: Linux Kernel Denial of service

What: Memory leak warning in the eBPF kernel subsystem related to per-CPU hash maps.
Who is affected: Linux systems using eBPF with per-CPU hash map operations.
Urgency: High severity rating; potential for memory exhaustion and denial of service over time.
Action: Apply the kernel patch fixing the kmemleak condition in the BPF subsystem.

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

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-37807

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-2025-378070.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-37807	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 vulnerabilities allow denial of servicecert-bund

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