GHSA-4H3Q-CF72-R99P

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-09-08 09:35
VLAI
Details

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
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64375"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:20Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-4h3q-cf72-r99p",
  "modified": "2026-09-08T09:35:35Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64375"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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