Memory leak in Linux kernel - CVE-2026-46171

Vulnerability identifier: #VU133027

CSH Severity: Low

CVSS v4 BT: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2026-46171

CWE-ID: CWE-401

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a memory leak in kvm_riscv_vcpu_alloc_vector_context when allocating vector context buffers. A local user can trigger the allocation failure path to cause a denial of service.

Linux kernel
openEuler
Ubuntu
bpftool-debuginfo
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel
bpftool
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-extra-modules
linux (Ubuntu package)
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-aws (Ubuntu package)

Install security update from vendor's repository.

bpftool-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
python3-perf - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
perf-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
perf - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-tools-devel - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
bpftool - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-debugsource - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-devel - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-headers - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-source - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-tools - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.19.156, 6.6.0-145.3.14.145
kernel-extra-modules - update to 6.6.0-145.3.14.145
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-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-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15

• https://git.kernel.org/stable/c/1d57ab45ec5c0e22789de793bcf2a31ad6fb7d98
• https://git.kernel.org/stable/c/b7c958d7c1eb1cb9b2be7b5ee4129fcd66cec978
• https://git.kernel.org/stable/c/bd62c0f61bc722a097417401030c596cea8e21aa

• Memory leak in Linux kernel riscv kvm
• openEuler 24.03 LTS SP3 update for kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• openEuler 24.03 LTS SP1 update for kernel
• Ubuntu update for linux-aws