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 — 4 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(28)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-08-25ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-25ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-25ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-25ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-25ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-25ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-25ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-25ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-25ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-25ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-08-25ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-25ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-08-25ubuntu
ubuntulinux-tools-lowlatency-hwe-22.04-edge (6.8.0-134.134.1~22.04.1) @ jammy2026-08-25ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-25ubuntu
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

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 (100 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 11× in last 7d / 126× 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 279 total refreshes for this CVE.

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

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.

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