{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "443574b033876c85a35de4c65c14f7fe092222b2"
            },
            {
              "fixed": "555fc6f1caf00ce7005e732b688da26c0dc3c5c5"
            },
            {
              "fixed": "801ae90f8ce099187e6224cec7d72d07a4df0324"
            },
            {
              "fixed": "71dbd143be598954ae103feadd12692aeb0f2f88"
            },
            {
              "fixed": "f2aaa621591093cfe8224a25ef2f04a3b1e304b0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.9.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90195.json"
  },
  "details": "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.",
  "id": "CVE-2026-90195",
  "modified": "2026-09-19T03:31:03.863002807Z",
  "published": "2026-09-17T16:07:14.979Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/555fc6f1caf00ce7005e732b688da26c0dc3c5c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71dbd143be598954ae103feadd12692aeb0f2f88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/801ae90f8ce099187e6224cec7d72d07a4df0324"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2aaa621591093cfe8224a25ef2f04a3b1e304b0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90195.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90195"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args"
}