CVE-2026-46259

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-03. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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)
EPSS
2.2%
KEV
Not listed

Published

June 3, 2026

Last Modified

June 9, 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(2)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-07-03ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-07-03ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-07-03ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-07-03ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-07-03ubuntu

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.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 21× in last 7d / 138× 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 148 total refreshes for this CVE.

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

Related CVEs(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 June 9, 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 2.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46259?
CVE-2026-46259 has a CVSS v3 base score of 7.8 (NVD).
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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