{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80663",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80663"
  ],
  "published": "2026-08-28T06:50:33Z",
  "summary": "tools/power/x86/intel-speed-select: Harden daemon pidfile open",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntools/power/x86/intel-speed-select: Harden daemon pidfile open\n\nAvoid symlink-based pidfile clobbering by opening the pidfile with\nO_NOFOLLOW and validating it with fstat() before locking/writing.\n\nThe daemon currently uses a fixed pidfile path under /tmp. A local\nunprivileged user can pre-create a symlink at that path and cause a\nroot-run daemon instance to write into an attacker-chosen file.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
  "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": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80663"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/905493a6338c82a70da16f86e0a6215db5a3d73d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db938eb9a3c1317596c28e94413b33426508d51b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72a07abc6b9046f07a08bba353cad7667bcc9dce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local filesystem access to plant a symlink at the fixed /tmp/hfi-events.pid path before the root-run intel-speed-select --oob daemon calls open(); there is no network, adjacent, or physical-device code path to daemonize().\nAC:L - The attacker fully controls symlink creation in world-writable /tmp and can leave it in place until the root daemon starts or restarts (e.g., via systemd on Sapphire Rapids datacenter hosts); no uncontrollable timing or memory-layout conditions are required.\nPR:L - Only an unprivileged local account is needed to create the /tmp/hfi-events.pid symlink; the attacker does not need init-namespace root, CAP_SYS_ADMIN, or any capability beyond ordinary local shell access.\nUI:N - Per CVSS 3.1, administrator installation or routine execution of the vulnerable daemon is not counted as user interaction; once the root OOB service is running, the attacker needs only the pre-planted symlink with no further victim action.\nS:U - The root daemon's misdirected open/write affects host filesystem objects within the same OS security authority; this is a local root-assisted file clobber, not a VM escape, container breakout, or IOMMU boundary bypass.\nC:N - The daemon only writes a short numeric PID string via write() and never reads from the opened descriptor; there is no memory corruption, out-of-bounds read, or other information-disclosure primitive.\nI:H - A symlink causes the root daemon's open(O_RDWR|O_CREAT) to follow into an attacker-chosen path, letting root truncate/overwrite the start of protected files (e.g., /etc/passwd, sudoers, unit files) or create new root-owned files in restricted directories.\nA:H - Overwriting the beginning of critical configuration or authentication files with root privileges can break login, service startup, or ISST OOB management, producing system-wide denial of service beyond a single daemon crash."
    }
  }
}