Medium [CVE-2026-89581] Linux kernel: Denial of Service due to incorrect BPF per-CPU address resolution on x86
This medium-severity Red Hat Linux advisory covers CVE-2026-89581.
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Summary
A flaw was found in the Linux kernel's handling of Berkeley Packet Filter (BPF) programs on x86 architecture. An issue with how per-CPU addresses are resolved into extended registers can lead to incorrect memory access.
A local attacker could exploit this by running a specially crafted BPF program. This could cause a kernel panic, resulting in a denial of service (DoS) to the system.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 59 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 59 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 59 minutes ago·verify at source
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