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TI-2026-33905 Aliases CVE-2026-46181GHSA-pw2f-xmgc-f22m

RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

Priority LOW 35CWE-366Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 31 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() Sashiko points out the radix_tree itself is RCU safe, but nothing ever frees the mlx4_srq struct with RCU, and it isn't even accessed within the RCU critical section. It also will crash if an event is delivered before the srq object is finished initializing. Use the spinlock since it isn't easy to make RCU work, use refcount_inc_not_zero() to protect against partially initialized objects, and order the refcount_set() to be after the srq is fully initialized.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00144 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.191, 6.6.160, 6.12.114 +3Red Hat: 18 advisoriesRed Hat: 31 fixed, 1 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
LinuxLinux4.9 and later6.1.191, 6.6.160, 6.12.114, 6.18.30, 7.0.7, 7.1Patch availableCNA
  • Linux VendorLinux Affected 4.9 and later Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.30, 7.0.7, 7.1 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.9 to before 6.18.30; 6.19 to before 7.0.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*7.1 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.9 to before 6.18.30; 6.19 to before 7.0.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.30, 7.0.7, 7.1

Red Hat 18 advisories

  • RHSA-2026:81523 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-4_18_0-553_109_1, kpatch-patch-4_18_0-553_125_1, kpatch-patch-4_18_0-553_158_1, kpatch-patch-4_18_0-553_72_1, and kpatch-patch-4_18_0-553_85_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) kpatch-patch-4_18_0-553_109_1-1-13.el8_10, kpatch-patch-4_18_0-553_125_1-1-10.el8_10, kpatch-patch-4_18_0-553_158_1-1-2.el8_10 +2
  • RHSA-2026:81452 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-687_10_1 and kpatch-patch-5_14_0-687_42_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-10.el9_8, kpatch-patch-5_14_0-687_42_1-1-1.el9_8
  • RHSA-2026:81451 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-570_116_1, kpatch-patch-5_14_0-570_135_1, kpatch-patch-5_14_0-570_39_1, kpatch-patch-5_14_0-570_66_1, and kpatch-patch-5_14_0-570_94_1 security update
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1-1-11.el9_6, kpatch-patch-5_14_0-570_135_1-1-2.el9_6, kpatch-patch-5_14_0-570_39_1-1-17.el9_6 +2
Show 15 more Red Hat advisories
  • RHSA-2026:81450 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-4_18_0-477_107_1, kpatch-patch-4_18_0-477_120_1, kpatch-patch-4_18_0-477_130_1, kpatch-patch-4_18_0-477_143_1, and kpatch-patch-4_18_0-477_161_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) kpatch-patch-4_18_0-477_107_1-1-16.el8_8, kpatch-patch-4_18_0-477_120_1-1-15.el8_8, kpatch-patch-4_18_0-477_130_1-1-13.el8_8 +2
  • RHSA-2026:81449 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-427_100_1, kpatch-patch-5_14_0-427_113_1, kpatch-patch-5_14_0-427_126_1, kpatch-patch-5_14_0-427_146_1, and kpatch-patch-5_14_0-427_84_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_100_1-1-16.el9_4, kpatch-patch-5_14_0-427_113_1-1-14.el9_4, kpatch-patch-5_14_0-427_126_1-1-11.el9_4 +2
  • RHSA-2026:81453 Released 2026-10-12 · Red Hat rating Important
    kpatch-patch-5_14_0-284_134_1, kpatch-patch-5_14_0-284_148_1, kpatch-patch-5_14_0-284_158_1, kpatch-patch-5_14_0-284_172_1, and kpatch-patch-5_14_0-284_188_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) kpatch-patch-5_14_0-284_134_1-1-17.el9_2, kpatch-patch-5_14_0-284_148_1-1-15.el9_2, kpatch-patch-5_14_0-284_158_1-1-13.el9_2 +2
  • RHSA-2026:41236 Released 2026-07-17 · Red Hat rating Critical
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debug-3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debug-devel-3.10.0-1160.155.1.rt56.1307.el7 +4
  • RHSA-2026:36216 Released 2026-07-07 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.155.1.el7, kernel-3.10.0-1160.155.1.el7, kernel-abi-whitelists-3.10.0-1160.155.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.155.1.el7, kernel-tools-libs-devel-3.10.0-1160.155.1.el7
  • RHSA-2026:35896 Released 2026-07-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.197.1.el8_4, kernel-4.18.0-305.197.1.el8_4, kernel-abi-stablelists-4.18.0-305.197.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.197.1.el8_4, kernel-4.18.0-305.197.1.el8_4, kernel-abi-stablelists-4.18.0-305.197.1.el8_4 +14
  • RHSA-2026:35894 Released 2026-07-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.199.1.el8_6, kernel-4.18.0-372.199.1.el8_6, kernel-abi-stablelists-4.18.0-372.199.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.199.1.el8_6, kernel-4.18.0-372.199.1.el8_6, kernel-abi-stablelists-4.18.0-372.199.1.el8_6 +14
  • RHSA-2026:35863 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.150.1.el8_8, kernel-4.18.0-477.150.1.el8_8, kernel-abi-stablelists-4.18.0-477.150.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.150.1.el8_8, kernel-4.18.0-477.150.1.el8_8, kernel-abi-stablelists-4.18.0-477.150.1.el8_8 +14
  • RHSA-2026:34443 Released 2026-07-01 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.135.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.135.1.el9_4, kernel-64k-devel-5.14.0-427.135.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.135.1.el9_4, kernel-5.14.0-427.135.1.el9_4, kernel-64k-5.14.0-427.135.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.135.1.el9_4, kernel-rt-core-5.14.0-427.135.1.el9_4, kernel-rt-debug-5.14.0-427.135.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.135.1.el9_4, kernel-rt-core-5.14.0-427.135.1.el9_4, kernel-rt-debug-5.14.0-427.135.1.el9_4 +11
  • RHSA-2026:34094 Released 2026-07-01 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.125.1.el9_6, libperf-5.14.0-570.125.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.125.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.125.1.el9_6, kernel-64k-devel-5.14.0-570.125.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.125.1.el9_6, kernel-64k-5.14.0-570.125.1.el9_6, kernel-64k-core-5.14.0-570.125.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.125.1.el9_6, kernel-rt-64k-5.14.0-570.125.1.el9_6, kernel-rt-64k-core-5.14.0-570.125.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.125.1.el9_6, kernel-rt-core-5.14.0-570.125.1.el9_6, kernel-rt-debug-5.14.0-570.125.1.el9_6 +11
  • RHSA-2026:34095 Released 2026-07-01 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.178.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.178.1.el9_2, kernel-64k-devel-5.14.0-284.178.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.178.1.el9_2, kernel-5.14.0-284.178.1.el9_2, kernel-64k-5.14.0-284.178.1.el9_2 +29
  • RHSA-2026:33900 Released 2026-07-01 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.178.1.rt14.463.el9_2, kernel-rt-core-5.14.0-284.178.1.rt14.463.el9_2, kernel-rt-debug-5.14.0-284.178.1.rt14.463.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.178.1.rt14.463.el9_2, kernel-rt-core-5.14.0-284.178.1.rt14.463.el9_2, kernel-rt-debug-5.14.0-284.178.1.rt14.463.el9_2 +11
  • RHSA-2026:25217 Released 2026-06-11 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.15.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.15.1.el9_8, kernel-64k-devel-5.14.0-687.15.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.15.1.el9_8, kernel-64k-5.14.0-687.15.1.el9_8, kernel-64k-core-5.14.0-687.15.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.15.1.el9_8, libperf-5.14.0-687.15.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.15.1.el9_8, kernel-rt-64k-5.14.0-687.15.1.el9_8, kernel-rt-64k-core-5.14.0-687.15.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.15.1.el9_8, kernel-rt-core-5.14.0-687.15.1.el9_8, kernel-rt-debug-5.14.0-687.15.1.el9_8 +9
  • RHSA-2026:25121 Released 2026-06-10 · Red Hat rating Critical
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.132.1.el8_10, kernel-4.18.0-553.132.1.el8_10, kernel-abi-stablelists-4.18.0-553.132.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.132.1.el8_10
  • RHSA-2026:25120 Released 2026-06-10 · Red Hat rating Critical
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-core-4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-debug-4.18.0-553.132.1.rt7.473.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-core-4.18.0-553.132.1.rt7.473.el8_10, kernel-rt-debug-4.18.0-553.132.1.rt7.473.el8_10 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:25217
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:34095
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:34443
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:25121, RHSA-2026:81523
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:25217, RHSA-2026:81452
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:35896
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:35894
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:35863, RHSA-2026:81450
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:34095, RHSA-2026:81453
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:34443, RHSA-2026:81449
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:34094, RHSA-2026:81451
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:35896
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:35894
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:35863
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:25121
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:25217
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:25120
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:25120
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:25217
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:33900
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:34443
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:25217
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:33900
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:34443
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:36216
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:36216
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:41236
Not affected: 2 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46181
  2. 2026-10-03 Alias added: GHSA-pw2f-xmgc-f22m
  3. 2026-10-12 Fix available: RHSA-2026:81453 · Red Hat
  4. 2026-10-12 Fix available: RHSA-2026:81449 · Red Hat
  5. 2026-10-13 Fix available: RHSA-2026:81450 · Red Hat
  6. 2026-10-13 Fix available: RHSA-2026:81451 · Red Hat
  7. 2026-10-13 Fix available: RHSA-2026:81452 · Red Hat
  8. 2026-10-13 Fix available: RHSA-2026:81523 · Red Hat
  9. 2026-10-13 Affected versions changed · Red Hat
  10. 2026-10-16 CISA SSVC decision points changed
  11. 2026-10-19 Weakness changed · CISA ADP
  12. 2026-10-21 Fix available: Linux/Linux@2d8b30b496bc53e961ba7415fd629fc27813017c, Linux/[email protected], Linux/[email protected] +1 · CNA
  13. 2026-10-21 2 new references · CNA
  14. 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@654aeddbc6e0f6e56531985bb12328ab4230c6c1 · CNA
  15. 2026-10-30 1 new reference · CNA

References

Patch 3

Other 3

  • 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