Race condition in Linux kernel - CVE-2026-46181

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Main Vulnerability Database Vulnerabilities #VU133017

Race condition in Linux kernel - CVE-2026-46181

Published: May 29, 2026


Vulnerability identifier: #VU133017
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46181
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in mlx4_srq_event() when handling RDMA SRQ events. A local user can trigger an event for a partially initialized srq object to cause a denial of service.

The issue can occur if an event is delivered before the srq object has finished initializing.


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
openEuler
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-devel
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
kernel-abi-stablelists
kernel-doc
python3-perf-debuginfo
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-source
kernel-tools-debuginfo
kernel-tools-devel
perf-debuginfo
linux (Ubuntu package)
linux-ibm (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-46181

Install security update from vendor's repository.

kernel (Red Hat package) - addressed in versions 3.10.0-1160.155.1.el7, 4.18.0-305.197.1.el8_4, 4.18.0-372.199.1.el8_6, 4.18.0-477.150.1.el8_8, 5.14.0-284.178.1.el9_2, 5.14.0-427.135.1.el9_4, 5.14.0-687.15.1.el9_8
kernel-rt (Red Hat package) - addressed in versions 3.10.0-1160.155.1.rt56.1307.el7, 4.18.0-553.132.1.rt7.473.el8_10, 5.14.0-284.178.1.rt14.463.el9_2
kernel-devel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-debug-modules-extra - update to 4.18.0-553.132.1.0.1
kernel-debug-modules - update to 4.18.0-553.132.1.0.1
kernel-debug-devel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-debug-core - update to 4.18.0-553.132.1.0.1
kernel-debug - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-cross-headers - update to 4.18.0-553.132.1.0.1
kernel-core - update to 4.18.0-553.132.1.0.1
kernel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
bpftool - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-headers - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-modules - update to 4.18.0-553.132.1.0.1
kernel-modules-extra - update to 4.18.0-553.132.1.0.1
kernel-tools - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-tools-libs - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-tools-libs-devel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
perf - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
python3-perf - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-7
kernel-abi-stablelists - update to 4.18.0-553.132.1.0.1
kernel-doc - update to 4.18.0-553.132.1.0.1
bpftool - update to 5.10.0-317.0.0.220
python3-perf-debuginfo - update to 5.10.0-317.0.0.220
kernel - update to 5.10.0-317.0.0.220
bpftool-debuginfo - update to 5.10.0-317.0.0.220
kernel-debuginfo - update to 5.10.0-317.0.0.220
kernel-debugsource - update to 5.10.0-317.0.0.220
kernel-devel - update to 5.10.0-317.0.0.220
kernel-headers - update to 5.10.0-317.0.0.220
kernel-source - update to 5.10.0-317.0.0.220
kernel-tools-debuginfo - update to 5.10.0-317.0.0.220
kernel-tools-devel - update to 5.10.0-317.0.0.220
perf - update to 5.10.0-317.0.0.220
perf-debuginfo - update to 5.10.0-317.0.0.220
python3-perf - update to 5.10.0-317.0.0.220
kernel-tools - update to 5.10.0-317.0.0.220
linux (Ubuntu package) - addressed in versions 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins