CVE-2026-46259
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2026-46259 NameCVE-2026-46259 DescriptionIn the Linux kernel, the following vulnerability has been resolved: p ... SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus…
CVE-2026-46259
| Name | CVE-2026-46259 |
| Description | In the Linux kernel, the following vulnerability has been resolved: p ... |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bullseye | 5.10.223-1 | vulnerable |
| bullseye (security) | 5.10.257-1 | fixed | |
| bookworm | 6.1.170-3 | fixed | |
| bookworm (security) | 6.1.174-1 | fixed | |
| trixie | 6.12.86-1 | fixed | |
| trixie (security) | 6.12.90-2 | fixed | |
| forky, sid | 7.0.10-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bullseye | 5.10.257-1 | |||
| linux | source | bookworm | 6.1.170-1 | |||
| linux | source | trixie | 6.12.85-1 | |||
| linux | source | (unstable) | 6.18.14-1 |
Notes
https://git.kernel.org/linus/76149d53502cf17ef3ae454ff384551236fba867 (7.0-rc1)
Apply commands
https://git.kernel.org/linus/76149d53502cf17ef3ae454ff384551236fba867 (7.0-rc1)OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.85-1 |
| sid | Fixed | 6.18.14-1 |
| forky | Fixed | 6.18.14-1 |
| bullseye | Fixed | 5.10.257-1 |
| bookworm | Fixed | 6.1.170-1 |
References
- https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04
- https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982
- https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306
- https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e
- https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6
- https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee
- https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6
- https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867
- https://security-tracker.debian.org/tracker/CVE-2026-46259
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.