| Name | CVE-2026-90195 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6528-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bookworm | 6.1.176-1 | fixed |
| bookworm (security) | 6.1.187-1 | fixed | |
| trixie | 6.12.107-1 | vulnerable | |
| trixie (security) | 6.12.111-1 | fixed | |
| forky | 7.2.8-1 | fixed | |
| sid | 7.2.9-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bookworm | (not affected) | |||
| linux | source | trixie | 6.12.111-1 | DSA-6528-1 | ||
| linux | source | (unstable) | 7.2.6-1 |
[bookworm] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/f2aaa621591093cfe8224a25ef2f04a3b1e304b0 (7.3-rc1)