CVE-2026-90195riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 32 days later
· 32 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 443574b033876c85a35de4c65c14f7fe092222b2 – < 555fc6f1caf00ce7005e732b688da26c0dc3c5c5
- affected 443574b033876c85a35de4c65c14f7fe092222b2 – < 801ae90f8ce099187e6224cec7d72d07a4df0324
- affected 443574b033876c85a35de4c65c14f7fe092222b2 – < 71dbd143be598954ae103feadd12692aeb0f2f88
- affected 443574b033876c85a35de4c65c14f7fe092222b2 – < f2aaa621591093cfe8224a25ef2f04a3b1e304b0
- affected 6.9
- unaffected < 6.9
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/555fc6f1caf00ce7005e732b688da26c0dc3c5c5 (opens in a new tab)
- https://git.kernel.org/stable/c/801ae90f8ce099187e6224cec7d72d07a4df0324 (opens in a new tab)
- https://git.kernel.org/stable/c/71dbd143be598954ae103feadd12692aeb0f2f88 (opens in a new tab)
- https://git.kernel.org/stable/c/f2aaa621591093cfe8224a25ef2f04a3b1e304b0 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-81788 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-90195)Record last updated .