{"id":"CVE-2026-90195","revision":"4b163adf7c254d8e920a65c4846e2261","records":[{"revision":"4b163adf7c254d8e920a65c4846e2261","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90195","aliases":[],"title":"riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args","description":"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.","state":0,"publishedAt":"2026-09-17T16:07:14.979+00:00","modifiedAt":"2026-10-19T08:59:31.672+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/riscv/net/bpf_jit_comp64.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"443574b033876c85a35de4c65c14f7fe092222b2\",\n                            \"lessThan\": \"555fc6f1caf00ce7005e732b688da26c0dc3c5c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"443574b033876c85a35de4c65c14f7fe092222b2\",\n                            \"lessThan\": \"801ae90f8ce099187e6224cec7d72d07a4df0324\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"443574b033876c85a35de4c65c14f7fe092222b2\",\n                            \"lessThan\": \"71dbd143be598954ae103feadd12692aeb0f2f88\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"443574b033876c85a35de4c65c14f7fe092222b2\",\n                            \"lessThan\": \"f2aaa621591093cfe8224a25ef2f04a3b1e304b0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/riscv/net/bpf_jit_comp64.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/555fc6f1caf00ce7005e732b688da26c0dc3c5c5","https://git.kernel.org/stable/c/801ae90f8ce099187e6224cec7d72d07a4df0324","https://git.kernel.org/stable/c/71dbd143be598954ae103feadd12692aeb0f2f88","https://git.kernel.org/stable/c/f2aaa621591093cfe8224a25ef2f04a3b1e304b0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90195","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90195","identifiers":["CVE-2026-90195"]},"retained":false,"historicalAffected":[]}],"coverage":[]}