CVE-2026-46259procfs: fix missing RCU protection when reading real_parent in do_task_stat()
- 7.8HighCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 21 days later
· 21 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < fefa0fcd78be465b7ad4c497fa6ec90d64194c04
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < c93a33f28f915d446eea6fb3f0e1def0b3af1982
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < 1c8dc5b5517546c68ffae40b948336122bb61306
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < 73ec7c96601d61d52310c659145bb06d933a0fa6
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < 4f9ae386861e280b7631ca252f798d25575627ee
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < dd8b13cb4ff1a4545a214ed897fdf2bc341155b6
- affected 06fffb1267c9d986687b69d74a46ee332a50575e – < 76149d53502cf17ef3ae454ff384551236fba867
- affected 2.6.26
- unaffected < 2.6.26
- unaffected 5.10.252 – ≤ 5.10.*
- unaffected 5.15.202 – ≤ 5.15.*
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.14 – ≤ 6.18.*
- unaffected 6.19.4 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04 (opens in a new tab)
- https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982 (opens in a new tab)
- https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306 (opens in a new tab)
- https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e (opens in a new tab)
- https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6 (opens in a new tab)
- https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee (opens in a new tab)
- https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 (opens in a new tab)
- https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-34121 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-46259)Record last updated .