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High · 7.8 CVE-2026-46181 EUVD-2026-32808GHSA-pw2f-xmgc-f22m

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

Published May 28, 2026 · Updated Oct 30, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel Package: linux Package: linux Package: linux-6.12 Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-7.0 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.15 Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.17 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fde-7.0 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-7.0 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.17 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-7.0 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-7.0 Package: linux-nvidia-bos Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oem-7.0 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-oracle-7.0 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.17 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-riscv-7.0 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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.

Affected products

VendorProductAffectedFixed
Linux Linux 4.9 6.1.191

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 7.0.7-1 —
Debian 13 linux 6.12.115-2 —
Debian 12 linux No fix yet —
Debian 12 linux-6.12 6.12.115-2~deb12u1 —
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield No fix yet —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield No fix yet —
Ubuntu 26.04 LTS linux 7.0.0-28.28 USN-8566-1
Ubuntu 26.04 LTS linux-aws +2 7.0.0-1009.9 USN-8618-1, USN-8603-1, USN-8568-1
Ubuntu 26.04 LTS linux-gcp +1 7.0.0-1008.8 USN-8593-1, USN-8566-1
Ubuntu 26.04 LTS linux-gke 7.0.0-1003.4 USN-8566-1
Ubuntu 26.04 LTS linux-ibm +1 7.0.0-1010.10 USN-8603-1, USN-8593-1
Ubuntu 26.04 LTS linux-nvidia 7.0.0-1016.16 USN-8663-1
Ubuntu 26.04 LTS linux-nvidia-bos 7.0.0-2016.16 USN-8664-1
Ubuntu 26.04 LTS linux-raspi 7.0.0-1015.15 USN-8618-1
Ubuntu 26.04 LTS linux-riscv +1 7.0.0-28.28.1 USN-8566-1
Ubuntu 25.10 linux +8 No fix yet —
Ubuntu 24.04 LTS linux +43 No fix yet —
Ubuntu 24.04 LTS linux-azure-7.0 7.0.0-1014.14~24.04.1 USN-8728-2
Ubuntu 24.04 LTS linux-azure-fde-7.0 7.0.0-1013.13~24.04.1 —
Ubuntu 24.04 LTS linux-gcp-7.0 +1 7.0.0-1011.11~24.04.1 USN-8728-3, USN-8728-1
Ubuntu 24.04 LTS linux-hwe-7.0 7.0.0-28.28~24.04.1 USN-8569-1
Ubuntu 24.04 LTS linux-nvidia-7.0 7.0.0-1016.16~24.04.1 USN-8663-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1035.38 USN-8781-1
Ubuntu 24.04 LTS linux-riscv-7.0 7.0.0-28.28.1~24.04.3 —
Show 17 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 22.04 LTS linux +59 No fix yet —
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime +3 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-realtime +2 No fix yet —
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux +21 No fix yet —
Ubuntu Pro 18.04 LTS linux +12 No fix yet —
Ubuntu Pro 16.04 LTS linux-gcp +4 No fix yet —
Ubuntu Pro 14.04 LTS linux-azure No fix yet —
ReleasePackageFixed inAdvisory
RHEL 9 kpatch-patch-5_14_0-687_10_1 1-10.el9_8 RHSA-2026:81452
RHEL 9 kpatch-patch-5_14_0-687_42_1 1-1.el9_8 RHSA-2026:81452
RHEL 9 rv +75 5.14.0-687.15.1.el9_8 RHSA-2026:25217
RHEL 8 kernel-rt +12 4.18.0-553.132.1.rt7.473.el8_10 RHSA-2026:25120
RHEL 8 kpatch-patch-4_18_0-553_109_1 1-13.el8_10 RHSA-2026:81523
RHEL 8 kpatch-patch-4_18_0-553_125_1 1-10.el8_10 RHSA-2026:81523
RHEL 8 kpatch-patch-4_18_0-553_158_1 1-2.el8_10 RHSA-2026:81523
RHEL 8 kpatch-patch-4_18_0-553_72_1 1-17.el8_10 RHSA-2026:81523
RHEL 8 kpatch-patch-4_18_0-553_85_1 1-15.el8_10 RHSA-2026:81523
RHEL 8 perf +26 4.18.0-553.132.1.el8_10 RHSA-2026:25121
Show 11 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Red Hat Rhel Extras Rt Els 7 kernel-rt +7 3.10.0-1160.155.1.rt56.1307.el7 RHSA-2026:41236
RHEL 9.6 EUS kpatch-patch-5_14_0-570_116_1 1-11.el9_6 RHSA-2026:81451
RHEL 9.6 EUS kpatch-patch-5_14_0-570_135_1 1-2.el9_6 RHSA-2026:81451
RHEL 9.6 EUS kpatch-patch-5_14_0-570_39_1 1-17.el9_6 RHSA-2026:81451
RHEL 9.6 EUS kpatch-patch-5_14_0-570_66_1 1-16.el9_6 RHSA-2026:81451
RHEL 9.6 EUS kpatch-patch-5_14_0-570_94_1 1-14.el9_6 RHSA-2026:81451
RHEL 9.6 EUS rv +77 5.14.0-570.125.1.el9_6 RHSA-2026:34094
RHEL 9.4 E4S bpftool 7.3.0-427.135.1.el9_4 RHSA-2026:34443
RHEL 9.4 E4S kpatch-patch-5_14_0-427_100_1 1-16.el9_4 RHSA-2026:81449
RHEL 9.4 E4S kpatch-patch-5_14_0-427_113_1 1-14.el9_4 RHSA-2026:81449
RHEL 9.4 E4S kpatch-patch-5_14_0-427_126_1 1-11.el9_4 RHSA-2026:81449
RHEL 9.4 E4S kpatch-patch-5_14_0-427_146_1 1-2.el9_4 RHSA-2026:81449
RHEL 9.4 E4S kpatch-patch-5_14_0-427_84_1 1-18.el9_4 RHSA-2026:81449
RHEL 9.4 E4S rv +62 5.14.0-427.135.1.el9_4 RHSA-2026:34443
RHEL 9.2 E4S bpftool 7.0.0-284.178.1.el9_2 RHSA-2026:34095
RHEL 9.2 E4S kernel-rt +14 5.14.0-284.178.1.rt14.463.el9_2 RHSA-2026:33900
RHEL 9.2 E4S kpatch-patch-5_14_0-284_134_1 1-17.el9_2 RHSA-2026:81453
RHEL 9.2 E4S kpatch-patch-5_14_0-284_148_1 1-15.el9_2 RHSA-2026:81453
RHEL 9.2 E4S kpatch-patch-5_14_0-284_158_1 1-13.el9_2 RHSA-2026:81453
RHEL 9.2 E4S kpatch-patch-5_14_0-284_172_1 1-10.el9_2 RHSA-2026:81453
RHEL 9.2 E4S kpatch-patch-5_14_0-284_188_1 1-2.el9_2 RHSA-2026:81453
RHEL 9.2 E4S perf +47 5.14.0-284.178.1.el9_2 RHSA-2026:34095
RHEL 8.8 TUS perf +17 4.18.0-477.150.1.el8_8 RHSA-2026:35863
RHEL 8.8 E4S kpatch-patch-4_18_0-477_107_1 1-16.el8_8 RHSA-2026:81450
RHEL 8.8 E4S kpatch-patch-4_18_0-477_120_1 1-15.el8_8 RHSA-2026:81450
RHEL 8.8 E4S kpatch-patch-4_18_0-477_130_1 1-13.el8_8 RHSA-2026:81450
RHEL 8.8 E4S kpatch-patch-4_18_0-477_143_1 1-9.el8_8 RHSA-2026:81450
RHEL 8.8 E4S kpatch-patch-4_18_0-477_161_1 1-2.el8_8 RHSA-2026:81450
RHEL 8.8 E4S perf +18 4.18.0-477.150.1.el8_8 RHSA-2026:35863
RHEL 8.6 EUS Long Life perf +17 4.18.0-372.199.1.el8_6 RHSA-2026:35894
RHEL 8.6 AUS perf +17 4.18.0-372.199.1.el8_6 RHSA-2026:35894
RHEL 8.4 EUS Long Life perf +17 4.18.0-305.197.1.el8_4 RHSA-2026:35896
RHEL 8.4 AUS perf +17 4.18.0-305.197.1.el8_4 RHSA-2026:35896
RHEL 7 ELS perf +18 3.10.0-1160.155.1.el7 RHSA-2026:36216

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 9 rv +73 5.14.0-687.15.1.el9_8 ALSA-2026:25217
AlmaLinux 8 kernel-rt +9 4.18.0-553.132.1.rt7.473.el8_10 ALSA-2026:25120
AlmaLinux 8 perf +24 4.18.0-553.132.1.el8_10 ALSA-2026:25121

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 9 kernel 5.14.0-687.15.1.el9_7.cloud.1.0 RXSA-2026:25217, RLSA-2026:25217
Rocky Linux 8 kernel 4.18.0-553.132.1.el8_10 RXSA-2026:25121, RLSA-2026:25121
Rocky Linux 8 kernel-rt 4.18.0-553.132.1.rt7.473.el8_10 RLSA-2026:25120
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.60.1 SUSE-SU-2026:2482-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.60.1.150700.17.35.4 SUSE-SU-2026:2482-1
SLES 15 SP7 kernel-obs-build 6.4.0-150700.53.60.2 SUSE-SU-2026:2482-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.317.1 SUSE-SU-2026:2450-1
Show 8 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +8 6.12.0-160000.35.1 SUSE-SU-2026:22127-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.35.1.160000.2.16 SUSE-SU-2026:22127-1
SLES 16.0 kernel-64kb +8 6.12.0-160000.35.1 SUSE-SU-2026:22127-1, SUSE-SU-2026:22099-1
SLES 16.0 kernel-default-base 6.12.0-160000.35.1.160000.2.16 SUSE-SU-2026:22127-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.35.1.160000.2.16 SUSE-SU-2026:22112-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.35.1 SUSE-SU-2026:22117-1, SUSE-SU-2026:22112-1
SLE Micro 6.1 kernel-default-base 6.4.0-47.1.21.24 SUSE-SU-2026:22137-1
SLE Micro 6.1 kernel-rt +1 6.4.0-48.1 SUSE-SU-2026:22458-1
SLE Micro 6.1 kernel-source +2 6.4.0-47.1 SUSE-SU-2026:22137-1
SLE Micro 6.0 kernel-default-base 6.4.0-47.1.21.24 SUSE-SU-2026:22108-1
SLE Micro 6.0 kernel-rt +1 6.4.0-48.1 SUSE-SU-2026:22433-1
SLE Micro 6.0 kernel-source +2 6.4.0-47.1 SUSE-SU-2026:22108-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.60.1 SUSE-SU-2026:2482-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_16 1-150700.1.5.2 SUSE-SU-2026:2591-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_16 1-150700.15.3.2 SUSE-SU-2026:2482-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.317.1 SUSE-SU-2026:2450-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_84 1-8.7.1 SUSE-SU-2026:2450-1
SUSE Real Time Module 15 SP7 kernel-rt +1 6.4.0-150700.7.59.2 SUSE-SU-2026:2591-1
SUSE Real Time Module 15 SP7 kernel-syms-rt 6.4.0-150700.7.59.1 SUSE-SU-2026:2591-1
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed kernel-source 7.0.11-1.1 openSUSE-SU-2026:10954-1
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.35.1.160000.2.16 openSUSE-SU-2026:20965-1
openSUSE Leap 16.0 kernel-rt +11 6.12.0-160000.35.1 openSUSE-SU-2026:20965-1

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel No fix yet —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 rv +28 5.14.0-687.17.1.el9_8 ELSA-2026-25217
Oracle Linux 8 perf +19 4.18.0-553.132.1.el8_10 ELSA-2026-25121

Advisories 50

References