{
  "cveId": "CVE-2026-90195",
  "url": "https://patchblox.com/security/cve/CVE-2026-90195",
  "summary": "CVE-2026-90195 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90195, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "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:  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 (\u0022bpf: Infer zext_dst based on static register liveness analysis\u0022), 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.",
  "published": "2026-09-17T17:17:14Z",
  "severity": "",
  "epss": 0.00209,
  "epssPercentile": 0.11094,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90195",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-90195",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90195",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90195",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90195",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-90195",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90195",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}