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TI-2026-33980 Aliases CVE-2026-46259GHSA-vg6r-r7wf-v3q2

procfs: fix missing RCU protection when reading real_parent in do_task_stat()

Priority LOW 35CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 31 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00121 1st percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.252, 5.15.202, 6.1.165 +5Red Hat: 12 advisoriesRed Hat: 31 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.26 and later5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0Patch availableCNA
  • Linux VendorLinux Affected 2.6.26 and later Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.26 to before 5.10.252; 5.11 to before 5.15.202; 5.16 to before 6.1.165; 6.2 to before 6.6.128; 6.7 to before 6.12.75; 6.13 to before 6.18.14; 6.19 to before 6.19.4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.26 to before 5.10.252; 5.11 to before 5.15.202; 5.16 to before 6.1.165; 6.2 to before 6.6.128; 6.7 to before 6.12.75; 6.13 to before 6.18.14; 6.19 to before 6.19.4 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0

Red Hat 12 advisories

  • RHSA-2026:95721 Released 2026-11-05 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.169.1.rt56.1321.el7, kernel-rt-debug-3.10.0-1160.169.1.rt56.1321.el7, kernel-rt-debug-devel-3.10.0-1160.169.1.rt56.1321.el7 +4
  • RHSA-2026:95556 Released 2026-11-05 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.169.1.el7, kernel-3.10.0-1160.169.1.el7, kernel-abi-whitelists-3.10.0-1160.169.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.169.1.el7, kernel-tools-libs-devel-3.10.0-1160.169.1.el7
  • RHSA-2026:94996 Released 2026-11-04 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.227.1.el8_6, kernel-4.18.0-372.227.1.el8_6, kernel-abi-stablelists-4.18.0-372.227.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.227.1.el8_6, kernel-4.18.0-372.227.1.el8_6, kernel-abi-stablelists-4.18.0-372.227.1.el8_6 +14
Show 9 more Red Hat advisories
  • RHSA-2026:94558 Released 2026-11-03 · Red Hat rating Critical
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-5.14.0-284.202.1.rt14.487.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-5.14.0-284.202.1.rt14.487.el9_2 +11
  • RHSA-2026:94477 Released 2026-11-03 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.202.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.202.1.el9_2, kernel-64k-devel-5.14.0-284.202.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.202.1.el9_2, kernel-5.14.0-284.202.1.el9_2, kernel-64k-5.14.0-284.202.1.el9_2 +29
  • RHSA-2026:92997 Released 2026-10-30 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.177.1.el8_8, kernel-4.18.0-477.177.1.el8_8, kernel-abi-stablelists-4.18.0-477.177.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.177.1.el8_8, kernel-4.18.0-477.177.1.el8_8, kernel-abi-stablelists-4.18.0-477.177.1.el8_8 +14
  • RHSA-2026:91585 Released 2026-10-28 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.216.1.el8_4, kernel-4.18.0-305.216.1.el8_4, kernel-abi-stablelists-4.18.0-305.216.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.216.1.el8_4, kernel-4.18.0-305.216.1.el8_4, kernel-abi-stablelists-4.18.0-305.216.1.el8_4 +14
  • RHSA-2026:91489 Released 2026-10-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.158.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.158.1.el9_4, kernel-64k-devel-5.14.0-427.158.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.158.1.el9_4, kernel-5.14.0-427.158.1.el9_4, kernel-64k-5.14.0-427.158.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.158.1.el9_4, kernel-rt-core-5.14.0-427.158.1.el9_4, kernel-rt-debug-5.14.0-427.158.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.158.1.el9_4, kernel-rt-core-5.14.0-427.158.1.el9_4, kernel-rt-debug-5.14.0-427.158.1.el9_4 +11
  • RHSA-2026:36541 Released 2026-07-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.31.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.31.1.el10_2, kernel-64k-devel-6.12.0-211.31.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.31.1.el10_2, kernel-64k-6.12.0-211.31.1.el10_2, kernel-64k-core-6.12.0-211.31.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.31.1.el10_2, libperf-6.12.0-211.31.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.31.1.el10_2, kernel-rt-64k-6.12.0-211.31.1.el10_2, kernel-rt-64k-core-6.12.0-211.31.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.31.1.el10_2, kernel-rt-core-6.12.0-211.31.1.el10_2, kernel-rt-debug-6.12.0-211.31.1.el10_2 +9
  • RHSA-2026:36349 Released 2026-07-07 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.140.1.el8_10, kernel-4.18.0-553.140.1.el8_10, kernel-abi-stablelists-4.18.0-553.140.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.140.1.el8_10
  • RHSA-2026:36348 Released 2026-07-07 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.140.1.rt7.481.el8_10, kernel-rt-core-4.18.0-553.140.1.rt7.481.el8_10, kernel-rt-debug-4.18.0-553.140.1.rt7.481.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.140.1.rt7.481.el8_10, kernel-rt-core-4.18.0-553.140.1.rt7.481.el8_10, kernel-rt-debug-4.18.0-553.140.1.rt7.481.el8_10 +7
  • RHSA-2026:36018 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.22.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.22.1.el9_8, kernel-64k-devel-5.14.0-687.22.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.22.1.el9_8, kernel-64k-5.14.0-687.22.1.el9_8, kernel-64k-core-5.14.0-687.22.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.22.1.el9_8, libperf-5.14.0-687.22.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-64k-5.14.0-687.22.1.el9_8, kernel-rt-64k-core-5.14.0-687.22.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-core-5.14.0-687.22.1.el9_8, kernel-rt-debug-5.14.0-687.22.1.el9_8 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:94477
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:91489
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:36349
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:91585
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:94996
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:92997
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:94477
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:91489
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:91585
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:94996
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:92997
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:36349
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:36348
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:36348
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:94558
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:91489
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:94558
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:91489
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:95556
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:95556
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:95721

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46259
  2. 2026-10-03 Alias added: GHSA-vg6r-r7wf-v3q2
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP
  5. 2026-10-29 Fix available: RHSA-2026:91585 · Red Hat
  6. 2026-10-29 Fix available: RHSA-2026:91489 · Red Hat
  7. 2026-10-30 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4) +3 · Red Hat
  8. 2026-10-30 Fix available: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8) · Red Hat
  9. 2026-10-31 Fix available: RHSA-2026:92997 · Red Hat
  10. 2026-11-03 Fix available: RHSA-2026:94477 · Red Hat
  11. 2026-11-03 Fix available: RHSA-2026:94558 · Red Hat
  12. 2026-11-03 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2), Red Hat Enterprise Linux Real Time E4S (v.9.2) +1 · Red Hat
  13. 2026-11-04 Fix available: RHSA-2026:94996 · Red Hat
  14. 2026-11-04 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) · Red Hat
  15. 2026-11-06 Fix available: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · Red Hat
  16. 2026-11-06 Fix available: RHSA-2026:95556 · Red Hat
  17. 2026-11-06 Fix available: Red Hat Enterprise Linux for Real Time (v. 7 ELS) · Red Hat
  18. 2026-11-06 Fix available: RHSA-2026:95721 · Red Hat

References

Patch 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences