Out-of-bounds write in Linux kernel - CVE-2026-46145

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Main Vulnerability Database Vulnerabilities #VU133041

Out-of-bounds write in Linux kernel - CVE-2026-46145

Published: May 29, 2026


Vulnerability identifier: #VU133041
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46145
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to overwrite kernel memory.

The vulnerability exists due to an out-of-bounds write in the RDMA/mana rx hash key handling when processing a user-supplied uAPI structure. A local user can supply a crafted rx_hash_key_len value to overwrite kernel memory.


Affected software

Linux kernel
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Anolis OS
Ubuntu
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-doc
kernel-abi-stablelists
python3-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules-extra
kernel-modules
kernel-headers
kernel-devel
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-46145

Install security update from vendor's repository.

kernel (Red Hat package) - addressed in versions 4.18.0-553.136.1.el8_10, 5.14.0-687.17.1.el9_8, 6.12.0-211.28.1.el10_2
kernel-rt (Red Hat package) - update to 4.18.0-553.136.1.rt7.477.el8_10
kernel-doc - update to 4.18.0-553.137.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.137.1.0.1
python3-perf - update to 4.18.0-553.137.1.0.1
perf - update to 4.18.0-553.137.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.137.1.0.1
kernel-tools-libs - update to 4.18.0-553.137.1.0.1
kernel-tools - update to 4.18.0-553.137.1.0.1
kernel-modules-extra - update to 4.18.0-553.137.1.0.1
kernel-modules - update to 4.18.0-553.137.1.0.1
kernel-headers - update to 4.18.0-553.137.1.0.1
kernel-devel - update to 4.18.0-553.137.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.137.1.0.1
kernel-debug-modules - update to 4.18.0-553.137.1.0.1
kernel-debug-devel - update to 4.18.0-553.137.1.0.1
kernel-debug-core - update to 4.18.0-553.137.1.0.1
kernel-debug - update to 4.18.0-553.137.1.0.1
kernel-cross-headers - update to 4.18.0-553.137.1.0.1
kernel-core - update to 4.18.0-553.137.1.0.1
kernel - update to 4.18.0-553.137.1.0.1
bpftool - update to 4.18.0-553.137.1.0.1
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1, 7.0.0-1008.8, 7.0.0-1010.10
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1061.64+1, 7.0.0-1009.9, 7.0.0-1015.15
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9

External References

Related Security Bulletins