{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "tools/power/x86/intel-speed-select/isst-daemon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "905493a6338c82a70da16f86e0a6215db5a3d73d",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
            },
            {
              "lessThan": "db938eb9a3c1317596c28e94413b33426508d51b",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
            },
            {
              "lessThan": "72a07abc6b9046f07a08bba353cad7667bcc9dce",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
            },
            {
              "lessThan": "19ffeb30fdfce63f8d6aca71bcdddb3f69d46278",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
            },
            {
              "lessThan": "e8adac69d1bdf035ef97cc914e845acd4ef08e28",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
            },
            {
              "lessThan": "607af438e6430893a822964c841a1994b33acccc",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "tools/power/x86/intel-speed-select/isst-daemon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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\u0027s 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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:48.835Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/905493a6338c82a70da16f86e0a6215db5a3d73d"
        },
        {
          "url": "https://git.kernel.org/stable/c/db938eb9a3c1317596c28e94413b33426508d51b"
        },
        {
          "url": "https://git.kernel.org/stable/c/72a07abc6b9046f07a08bba353cad7667bcc9dce"
        },
        {
          "url": "https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28"
        },
        {
          "url": "https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc"
        }
      ],
      "title": "tools/power/x86/intel-speed-select: Harden daemon pidfile open",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80663",
    "datePublished": "2026-08-28T06:49:06.882Z",
    "dateReserved": "2026-08-26T14:34:25.781Z",
    "dateUpdated": "2026-08-29T06:21:48.835Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}