CVE-2026-90066 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20507177
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90066 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
ftrace_direct_multi_init() assigns kthread_run()'s return value to simple_tsk without an IS_ERR() check. When kthread_run() fails it returns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads with simple_tsk holding an error pointer. On unload, ftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(), leading to a null-pointer-dereference.
Check the return value of kthread_run() with IS_ERR(); on failure, unregister the ftrace direct call and propagate the error code.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90066
- https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f
- https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf
- https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830
- https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94
- https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf