CVE-2026-90195 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506704
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90195 (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:
riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args
On RV64, the ABI requires sign-extension for signed 1-byte and 2-byte kfunc args. However, the RV64 JIT currently does not perform sign-extension for such kfunc args.
Before commit 7ce090afbf72 ("bpf: Infer zext_dst based on static register liveness analysis"), state pruning could potentially omit zero-extension of 32-bit subregisters, which inadvertently masked the above issue by making the args appear as if they had been properly sign-extended. After that commit, the problem is exposed, causing the kfunc_call/kfunc_call_test4 selftest to fail.
Fix this by extending the existing sign-extension logic to handle signed 1-byte and 2-byte kfunc args as well.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90195
- https://git.kernel.org/stable/c/555fc6f1caf00ce7005e732b688da26c0dc3c5c5
- https://git.kernel.org/stable/c/71dbd143be598954ae103feadd12692aeb0f2f88
- https://git.kernel.org/stable/c/801ae90f8ce099187e6224cec7d72d07a4df0324
- https://git.kernel.org/stable/c/f2aaa621591093cfe8224a25ef2f04a3b1e304b0