{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80671",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80671"
  ],
  "published": "2026-08-28T06:50:33Z",
  "summary": "perf sched: Fix register_pid() overflow, strcpy, and BUG_ON",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf sched: Fix register_pid() overflow, strcpy, and BUG_ON\n\nregister_pid() has several issues when processing untrusted perf.data:\n\n1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap\n   to a small value on 32-bit systems when pid is large (e.g.\n   0x40000000), causing realloc to return a tiny buffer followed by\n   out-of-bounds writes in the initialization loop.\n\n2. Heap buffer overflow: strcpy(task->comm, comm) copies the\n   untrusted comm string into a fixed 20-byte COMM_LEN buffer with\n   no length check.\n\n3. BUG_ON on allocation failure: perf.data is untrusted input, so\n   allocation failures should be handled gracefully rather than\n   killing the process.\n\n4. Realloc of sched->tasks assigned directly back, leaking the old\n   pointer on failure; nr_tasks incremented before the realloc,\n   leaving corrupted state on failure.\n\nCap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum\non 64-bit), replace strcpy with strlcpy, guard against NULL comm,\nreplace BUG_ON with NULL returns using safe realloc patterns, and\nadd NULL checks in callers that dereference the result.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80671"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/344e59fc4f2cba6dc04ce5e2a77388645d4ca834"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/22263d241bad753217d545f8085b7ead52e2873b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2003918e13f43cf6c5698be3cc9aa3657dd676a8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/29639f00bfa49da7904ba0a499e0da7a0e5d735e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/261d2b5f4afa0570ca906e553c93811c5abe4590"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z"
  }
}