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