CVE-2026-90317

CVE CVE-2026-90317EUVD EUVD-2026-81978Published 2026-09-17T16:08:35.000ZLast changed 2026-09-18T17:54:32.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Invalidate RCU pointers after final spin unlock In a sleepable BPF program, a spin lock can provide the only RCU protection for a kptr. The final bpf_spin_unlock() ends that protection, but the verifier leaves the pointer valid. Another CPU can then free the object before the pointer is used. A capability-limited runtime PoC triggered a task_struct use-after-free in __bpf_get_task_stack(). Record whether the program is in an RCU-protected context before releasing the lock. Invalidate RCU-protected pointers only when the unlock leaves the final such context. This preserves valid pointers in non-sleepable programs and inside an explicit RCU read-side section.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 6.6; patch: 7.2.6; patch: 7.3-rc1; 5861d1e8dbc4e1a03ebffb96ac041026cdd34c07 <7ae71629357d0a6d0bdadb929c7b296d5b7e61c2; 5861d1e8dbc4e1a03ebffb96ac041026cdd34c07 <180c7000712db77063b3a26f4c97e7dd9038f449; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.