CVE-2026-46259

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-03. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

June 3, 2026

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Jun 5, 2026
No patch confirmed yet.
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306
generic

procfs: fix missing RCU protection when reading real_parent in do_task_stat() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e

Vendor Advisories for CVE-2026-46259(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-aws-edge (5.15.0.1112.119~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-14ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-14ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-14ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-09-14ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-09-14ubuntu
ubuntulowlatency-4.4 (4.4.0-243) @ xenial2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
redhatkernel-0:6.12.0-211.31.1.el10_22026-07-08redhat
redhatkernel-0:4.18.0-553.140.1.el8_102026-07-07redhat
redhatkernel-rt-0:4.18.0-553.140.1.rt7.481.el8_102026-07-07redhat
redhatkernel-0:5.14.0-687.22.1.el9_82026-07-06redhat
linuxKernel @ 5.10.252—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

Additional Vendor Advisories

(21)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 298 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:31 UTCEPSS rescore
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-14 05:33 UTCEG score recompute
  6. 2026-09-14 05:33 UTCVendor advisory
  7. 2026-09-14 05:33 UTCGHSA enrichment
  8. 2026-09-13 16:47 UTCEPSS rescore
  9. 2026-09-12 23:36 UTCOSV refresh
  10. 2026-09-12 15:01 UTCEPSS rescore
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 09:37 UTCEPSS rescore
  13. 2026-09-10 09:34 UTCEPSS rescore
  14. 2026-09-08 22:00 UTCEPSS rescore
  15. 2026-09-07 16:01 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-04 05:06 UTCEPSS rescore
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 03:38 UTCEG score recompute
  2. 2026-08-25 03:38 UTCVendor advisory
  3. 2026-08-25 03:38 UTCGHSA enrichment
  4. 2026-08-23 23:52 UTCVendor advisory
  5. 2026-08-23 23:51 UTCGHSA enrichment
  6. 2026-08-23 12:48 UTCEG score recompute
  7. 2026-08-23 12:48 UTCVendor advisory
  8. 2026-08-23 12:48 UTCGHSA enrichment
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-21 20:13 UTCVendor advisory
  11. 2026-08-21 20:13 UTCGHSA enrichment
  12. 2026-08-21 08:27 UTCEG score recompute
  13. 2026-08-21 08:27 UTCVendor advisory
  14. 2026-08-21 08:27 UTCGHSA enrichment
  15. 2026-08-20 22:55 UTCEPSS rescore
  16. 2026-08-20 21:20 UTCVendor advisory
  17. 2026-08-20 21:20 UTCGHSA enrichment
  18. 2026-08-20 10:02 UTCEG score recompute
  19. 2026-08-20 10:02 UTCVendor advisory
  20. 2026-08-20 10:01 UTCGHSA enrichment
  21. 2026-08-19 17:04 UTCEPSS rescore
  22. 2026-08-18 13:48 UTCEPSS rescore
  23. 2026-08-17 14:46 UTCEG score recompute
  24. 2026-08-17 14:46 UTCVendor advisory
  25. 2026-08-17 14:46 UTCGHSA enrichment
  26. 2026-08-17 13:47 UTCEPSS rescore
  27. 2026-08-17 03:45 UTCVendor advisory
  28. 2026-08-17 03:45 UTCGHSA enrichment
  29. 2026-08-16 14:56 UTCEG score recompute
  30. 2026-08-16 14:56 UTCVendor advisory
  31. 2026-08-16 14:56 UTCGHSA enrichment
  32. 2026-08-16 14:56 UTCEPSS rescore
  33. 2026-08-16 02:17 UTCEG score recompute
  34. 2026-08-16 02:17 UTCVendor advisory
  35. 2026-08-16 02:17 UTCGHSA enrichment
  36. 2026-08-16 02:14 UTCEPSS rescore
  37. 2026-08-15 14:44 UTCEG score recompute
  38. 2026-08-15 14:44 UTCVendor advisory
  39. 2026-08-15 14:44 UTCGHSA enrichment
  40. 2026-08-15 01:30 UTCEPSS rescore
  41. 2026-08-14 21:00 UTCVendor advisory
  42. 2026-08-14 21:00 UTCGHSA enrichment
  43. 2026-08-14 09:59 UTCVendor advisory
  44. 2026-08-14 09:59 UTCGHSA enrichment
  45. 2026-08-13 22:57 UTCEG score recompute
  46. 2026-08-13 22:57 UTCVendor advisory
  47. 2026-08-13 22:57 UTCGHSA enrichment
  48. 2026-08-13 22:00 UTCEPSS rescore
  49. 2026-08-13 06:38 UTCVendor advisory
  50. 2026-08-13 06:38 UTCGHSA enrichment
  51. 2026-08-12 19:36 UTCEG score recompute
  52. 2026-08-12 19:36 UTCVendor advisory
  53. 2026-08-12 19:36 UTCGHSA enrichment
  54. 2026-08-12 13:51 UTCEPSS rescore
  55. 2026-08-12 08:35 UTCVendor advisory
  56. 2026-08-12 08:35 UTCGHSA enrichment
  57. 2026-08-11 20:40 UTCEG score recompute
  58. 2026-08-11 20:40 UTCVendor advisory
  59. 2026-08-11 20:40 UTCGHSA enrichment
  60. 2026-08-11 09:39 UTCEG score recompute
  61. 2026-08-11 09:39 UTCVendor advisory
  62. 2026-08-11 09:39 UTCGHSA enrichment
  63. 2026-08-11 00:00 UTCEPSS rescore
  64. 2026-08-10 22:38 UTCVendor advisory
  65. 2026-08-10 22:38 UTCGHSA enrichment
  66. 2026-08-10 04:56 UTCVendor advisory
  67. 2026-08-10 04:56 UTCGHSA enrichment
  68. 2026-08-09 17:54 UTCEG score recompute
  69. 2026-08-09 17:54 UTCVendor advisory
  70. 2026-08-09 17:54 UTCGHSA enrichment
  71. 2026-08-09 13:46 UTCEPSS rescore
  72. 2026-08-09 06:53 UTCVendor advisory
  73. 2026-08-09 06:53 UTCGHSA enrichment
  74. 2026-08-08 19:52 UTCEG score recompute
  75. 2026-08-08 19:52 UTCVendor advisory

Related CVEs(same product + same vendor)

Frequently asked(5)

What is CVE-2026-46259?
CVE-2026-46259 is a high vulnerability published on June 3, 2026. In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading realparent in dotask_stat() When reading /proc/[pid]/stat, dotaskstat() accesses task->real_parent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- dotaskstat…
When was CVE-2026-46259 disclosed?
CVE-2026-46259 was first published in the National Vulnerability Database on June 3, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46259 actively exploited?
CVE-2026-46259 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.9% of all scored CVEs.
What is the CVSS score of CVE-2026-46259?
CVE-2026-46259 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-46259?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46259, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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