Skip to content
Heist/ feed
High

procfs: fix missing RCU protection when reading real_parent in do_task_stat()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat() When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- do_task_stat var = task->real_parent release_task call_rcu(delayed_put_task_struct) task_tgid_nr_ns(var) rcu_read_lock <--- Too late to protect task->real_parent! task_pid_ptr <--- UAF! rcu_read_unlock This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.

Announced Source revision 1
Original source ↗

CVE-2026-46259

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-2026-46259

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": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "fefa0fcd78be465b7ad4c497fa6ec90d64194c04",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "c93a33f28f915d446eea6fb3f0e1def0b3af1982",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "1c8dc5b5517546c68ffae40b948336122bb61306",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "73ec7c96601d61d52310c659145bb06d933a0fa6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "4f9ae386861e280b7631ca252f798d25575627ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "dd8b13cb4ff1a4545a214ed897fdf2bc341155b6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "06fffb1267c9d986687b69d74a46ee332a50575e",
        "lessThan": "76149d53502cf17ef3ae454ff384551236fba867",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/proc/array.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.26"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.26",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.252",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.202",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.165",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.128",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.75",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/proc/array.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46259

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40164 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement