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proc: protect ptrace_may_access() with exec_update_lock (FD links)

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

CVE-2026-64375

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64375

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "6253dfee5afba536bb54fc6fe6c091c3758fafe1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "65bf0d2b6e914f1448d6a2fde193dcf60936a651",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "83b17872e3166c295c599279fc9562ac3840c638",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "497c6bae5167428596575f20af6613ff5671f383",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "dfd1894cb64cbd8758b461ed713800fe73db4f82",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "778c1144771f0064b6f51bee865cceb0d996f2f9",
        "lessThan": "6255da28d4bb5349fe18e84cb043ccd394eba75d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/proc/base.c",
      "fs/proc/fd.c",
      "fs/proc/internal.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/proc/base.c",
      "fs/proc/fd.c",
      "fs/proc/internal.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64375

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41019 · Revision 1
Added to Heist Feed
Publisher date
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