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CVE-2026-64375 (GCVE-0-2026-64375)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-09-08 08:50
VLAI
Title
proc: protect ptrace_may_access() with exec_update_lock (FD links)
Summary
In the Linux kernel, the following vulnerability has been resolved: proc: protect ptrace_may_access() with exec_update_lock (FD links) proc_pid_get_link() and proc_pid_readlink() currently look up the task from the pid once, then do the ptrace access check on that task, then look up the task from the pid a second time to do the actual access. That's racy in several ways. To fix it, pass the task to the ->proc_get_link() handler, and instead of proc_fd_access_allowed(), introduce a new helper call_proc_get_link() that looks up and locks the task, does the access check, and calls ->proc_get_link().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < 6253dfee5afba536bb54fc6fe6c091c3758fafe1 (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < 65bf0d2b6e914f1448d6a2fde193dcf60936a651 (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < 138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2 (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < 83b17872e3166c295c599279fc9562ac3840c638 (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < 497c6bae5167428596575f20af6613ff5671f383 (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < dfd1894cb64cbd8758b461ed713800fe73db4f82 (git)
Affected: 778c1144771f0064b6f51bee865cceb0d996f2f9 , < 6255da28d4bb5349fe18e84cb043ccd394eba75d (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (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: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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        ],
        "configurations": [
          {
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              {
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                "negate": false,
                "operator": "OR"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nproc: protect ptrace_may_access() with exec_update_lock (FD links)\n\nproc_pid_get_link() and proc_pid_readlink() currently look up the task from\nthe pid once, then do the ptrace access check on that task, then look up\nthe task from the pid a second time to do the actual access.\nThat\u0027s racy in several ways.\n\nTo fix it, pass the task to the -\u003eproc_get_link() handler, and instead of\nproc_fd_access_allowed(), introduce a new helper call_proc_get_link() that\nlooks up and locks the task, does the access check, and calls\n-\u003eproc_get_link()."
          }
        ],
        "id": "CVE-2026-64375",
        "lastModified": "2026-09-08T14:31:06.567",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "tags": [
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            ],
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-29T12:53:38+00:00",
      "cve": "CVE-2026-64375",
      "id": "CVE-2026-64375",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: proc: protect ptrace_may_access() with exec_update_lock (FD links)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64375.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:41:06Z",
      "cve": "CVE-2026-64375",
      "id": "CVE-2026-64375",
      "initial_release_date": "2026-07-25T16:00:40Z",
      "product_status:known_affected": "733",
      "product_status:recommended": "111",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64375",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64375.json",
      "version": "12"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.