Bug 2525421 (CVE-2026-80669)

Summary: CVE-2026-80669 kernel: bpf: Disable xfrm_decode_session hook attachment
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. A local attacker with the ability to load BPF (Berkeley Packet Filter) LSM (Linux Security Module) programs could exploit a vulnerability in the `xfrm_decode_session` hook. This could lead to a system panic, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-28 07:44:08 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Disable xfrm_decode_session hook attachment

BPF LSM programs can currently attach to xfrm_decode_session(). That
hook may return an error, but security_skb_classify_flow() calls it
from a void path and triggers BUG_ON() if an error is returned.

Disable BPF attachment to the hook to prevent a BPF LSM program from
turning packet classification into a full panic.
Comment 1 gkamathe 2026-08-31 12:41:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082847-CVE-2026-80669-c4cd@gregkh/T