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

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Summary

CVECVE-2026-46259
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 18:16:26 UTC
Updated2026-06-03 18:16:26 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e fefa0fcd78be465b7ad4c497fa6ec90d64194c04 git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e c93a33f28f915d446eea6fb3f0e1def0b3af1982 git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e 1c8dc5b5517546c68ffae40b948336122bb61306 git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e 73ec7c96601d61d52310c659145bb06d933a0fa6 git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e 4f9ae386861e280b7631ca252f798d25575627ee git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 git Not specified
CNA Linux Linux affected 06fffb1267c9d986687b69d74a46ee332a50575e 76149d53502cf17ef3ae454ff384551236fba867 git Not specified
CNA Linux Linux affected 2.6.26 Not specified
CNA Linux Linux unaffected 2.6.26 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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