FKIE_CVE-2026-64375

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-27 05:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/proc/base.c",
            "fs/proc/fd.c",
            "fs/proc/internal.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6253dfee5afba536bb54fc6fe6c091c3758fafe1",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "65bf0d2b6e914f1448d6a2fde193dcf60936a651",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "83b17872e3166c295c599279fc9562ac3840c638",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "497c6bae5167428596575f20af6613ff5671f383",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "dfd1894cb64cbd8758b461ed713800fe73db4f82",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            },
            {
              "lessThan": "6255da28d4bb5349fe18e84cb043ccd394eba75d",
              "status": "affected",
              "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/proc/base.c",
            "fs/proc/fd.c",
            "fs/proc/internal.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.18"
            },
            {
              "lessThan": "2.6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "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": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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": "2026-07-27T05:16:44.250",
  "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-25T10:17:20.593",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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