Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2026-90317

7.8 · HIGH

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 protectio…

Published Sep 17, 2026EPSS 0.17%

Overview

CVE-2026-90317 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/180c7000712db77063b3a26f4c97e7dd9038f449Refgit.kernel.org/stable/c/7ae71629357d0a6d0bdadb929c7b296d5b7e61c2Refgit.kernel.org/stable/c/f81972b235f3ebfa40bdce8bcfee3f242fb24065

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90317?

CVE-2026-90317 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90317?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-90317?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90317?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90317 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →