{
  "cveId": "CVE-2026-74751",
  "url": "https://patchblox.com/security/cve/CVE-2026-74751",
  "summary": "CVE-2026-74751 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74751 (version 7.1.10-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  riscv: lib: Fix ZBB strnlen reading past count b...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  riscv: lib: Fix ZBB strnlen reading past count boundary  The ZBB-optimized strnlen loop loads one word ahead before checking the aligned boundary:      REG_L   t1, SZREG(t0)       // load next word     addi    t0, t0, SZREG       // advance     orc.b   t1, t1     bgeu    t0, t4, 4f          // boundary check AFTER load  where t4 = (s \u002B count) \u0026 -SZREG.  When s is aligned and count is a multiple of SZREG, t4 equals s \u002B count and the loop loads a full word starting at exactly s \u002B count.  If s \u002B count falls on a page boundary with the next page unmapped, this faults.  Fix by computing the aligned boundary from the last valid byte (s \u002B count - 1) instead of s \u002B count.  This makes the loop stop at the word containing the last valid byte rather than potentially loading the word after it.  The count == 0 case is already handled by the beqz early exit.  Also add a pre-loop guard (bgeu t0, t4) for the case where all valid bytes fit within the first word.  With the adjusted boundary, t4 can equal t0, and entering the loop with stale register state from the first-word processing would produce incorrect results.  The final minu clamp ensures the result is still correct when the last loaded word extends past s \u002B count - 1 within the same aligned word.",
  "published": "2026-08-26T15:16:54Z",
  "severity": "critical",
  "cvss": 9.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
  "epss": 0.00459,
  "epssPercentile": 0.39985,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.10-1",
      "fix": "DEBIAN-CVE-2026-74751",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-74751",
      "released": "2026-09-04T01:46:23Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}