Vulnerability-Lookup

GHSA-3M25-QFR7-C9R2

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-29 09:30

Details

In the Linux kernel, the following vulnerability has been resolved:

tools/power/x86/intel-speed-select: Harden daemon pidfile open

Avoid symlink-based pidfile clobbering by opening the pidfile with O_NOFOLLOW and validating it with fstat() before locking/writing.

The daemon currently uses a fixed pidfile path under /tmp. A local unprivileged user can pre-create a symlink at that path and cause a root-run daemon instance to write into an attacker-chosen file.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80663"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:51Z",
    "severity": "HIGH"
  },
  "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.",
  "id": "GHSA-3m25-qfr7-c9r2",
  "modified": "2026-08-29T09:30:27Z",
  "published": "2026-08-28T09:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80663"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72a07abc6b9046f07a08bba353cad7667bcc9dce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/905493a6338c82a70da16f86e0a6215db5a3d73d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db938eb9a3c1317596c28e94413b33426508d51b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-80663 (GCVE-0-2026-80663)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:49 – Updated: 2026-08-29 06:21

Title

tools/power/x86/intel-speed-select: Harden daemon pidfile open

Summary

In the Linux kernel, the following vulnerability has been resolved: tools/power/x86/intel-speed-select: Harden daemon pidfile open Avoid symlink-based pidfile clobbering by opening the pidfile with O_NOFOLLOW and validating it with fstat() before locking/writing. The daemon currently uses a fixed pidfile path under /tmp. A local unprivileged user can pre-create a symlink at that path and cause a root-run daemon instance to write into an attacker-chosen file.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/905493a6338c82a70…
https://git.kernel.org/stable/c/db938eb9a3c131759…
https://git.kernel.org/stable/c/72a07abc6b9046f07…
https://git.kernel.org/stable/c/19ffeb30fdfce63f8…
https://git.kernel.org/stable/c/e8adac69d1bdf035e…
https://git.kernel.org/stable/c/607af438e6430893a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 , < 905493a6338c82a70da16f86e0a6215db5a3d73d (git) Affected: 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 , < db938eb9a3c1317596c28e94413b33426508d51b (git) Affected: 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 , < 72a07abc6b9046f07a08bba353cad7667bcc9dce (git) Affected: 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 , < 19ffeb30fdfce63f8d6aca71bcdddb3f69d46278 (git) Affected: 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 , < e8adac69d1bdf035ef97cc914e845acd4ef08e28 (git) Affected: 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 , < 607af438e6430893a822964c841a1994b33acccc (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "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",
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              "versionType": "git"
            },
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              "lessThan": "db938eb9a3c1317596c28e94413b33426508d51b",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
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              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "e8adac69d1bdf035ef97cc914e845acd4ef08e28",
              "status": "affected",
              "version": "7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6",
              "versionType": "git"
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            {
              "lessThan": "607af438e6430893a822964c841a1994b33acccc",
              "status": "affected",
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              "versionType": "git"
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          "product": "Linux",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "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",
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              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
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              "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",
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                },
                {
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                {
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                }
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      ],
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        {
          "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"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278"
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          "url": "https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28"
        },
        {
          "url": "https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc"
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      "title": "tools/power/x86/intel-speed-select: Harden daemon pidfile open",
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        "engine": "bippy-1.2.0"
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  "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-3M25-QFR7-C9R2

CVE-2026-80663 (GCVE-0-2026-80663)

Tags

Sightings

Nomenclature