{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90195","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.792Z","datePublished":"2026-09-17T16:07:14.979Z","dateUpdated":"2026-09-17T16:07:14.979Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-17T16:07:14.979Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args\n\nOn RV64, the ABI requires sign-extension for signed 1-byte and 2-byte kfunc\nargs. However, the RV64 JIT currently does not perform sign-extension for\nsuch kfunc args.\n\nBefore commit 7ce090afbf72 (\"bpf: Infer zext_dst based on static register\nliveness analysis\"), state pruning could potentially omit zero-extension\nof 32-bit subregisters, which inadvertently masked the above issue by making\nthe args appear as if they had been properly sign-extended. After that\ncommit, the problem is exposed, causing the kfunc_call/kfunc_call_test4\nselftest to fail.\n\nFix this by extending the existing sign-extension logic to handle signed\n1-byte and 2-byte kfunc args as well."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/net/bpf_jit_comp64.c"],"versions":[{"version":"443574b033876c85a35de4c65c14f7fe092222b2","lessThan":"555fc6f1caf00ce7005e732b688da26c0dc3c5c5","status":"affected","versionType":"git"},{"version":"443574b033876c85a35de4c65c14f7fe092222b2","lessThan":"801ae90f8ce099187e6224cec7d72d07a4df0324","status":"affected","versionType":"git"},{"version":"443574b033876c85a35de4c65c14f7fe092222b2","lessThan":"71dbd143be598954ae103feadd12692aeb0f2f88","status":"affected","versionType":"git"},{"version":"443574b033876c85a35de4c65c14f7fe092222b2","lessThan":"f2aaa621591093cfe8224a25ef2f04a3b1e304b0","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/net/bpf_jit_comp64.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/555fc6f1caf00ce7005e732b688da26c0dc3c5c5"},{"url":"https://git.kernel.org/stable/c/801ae90f8ce099187e6224cec7d72d07a4df0324"},{"url":"https://git.kernel.org/stable/c/71dbd143be598954ae103feadd12692aeb0f2f88"},{"url":"https://git.kernel.org/stable/c/f2aaa621591093cfe8224a25ef2f04a3b1e304b0"}],"title":"riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args","x_generator":{"engine":"bippy-1.2.0"}}}}