Improper update of reference count in Linux kernel - CVE-2026-43465

Vulnerability identifier: #VU130715

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-2026-43465

CWE-ID: CWE-911

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 improper reference counting in the mlx5 XDP receive path when processing XDP multi-buffer packets on striding RQ. A local user can trigger XDP actions that alter the XDP buffer layout to cause a kernel warning and crash.

The issue affects multiple XDP actions, including XDP_TX, XDP_REDIRECT, XDP_PASS, and packet drops after buffer layout changes caused by bpf_xdp_pull_data() or bpf_xdp_adjust_tail().

Linux kernel
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
Public Cloud Module
Ubuntu
openEuler
kernel-livepatch-SLE15-SP7-RT_Update_18-debugsource
kernel-livepatch-6_4_0-150700_7_67-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_67-rt
kernel-livepatch-6_4_0-150700_53_73-default-debuginfo
kernel-livepatch-6_4_0-150700_53_73-default
kernel-livepatch-SLE15-SP7_Update_19-debugsource
kernel-rt-devel
ocfs2-kmp-rt
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
ocfs2-kmp-rt-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt
dlm-kmp-rt
kernel-rt-debuginfo
kernel-devel-rt
kernel-source-rt
kernel-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-rt-devel-debuginfo
kernel-syms
kernel-macros
kernel-devel
kernel-source
kernel-docs
kernel-64kb-devel-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-default
kernel-64kb-debuginfo
kernel-obs-build-debugsource
ocfs2-kmp-default
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default
gfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-obs-build
kernel-64kb-debugsource
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure
kernel-default-livepatch
kernel-default-livepatch-devel
kernel-default-extra
kernel-default-extra-debuginfo
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-debugsource
kernel-default-debuginfo
kernel-default-devel
kernel-default-devel-debuginfo
kernel-64kb
kernel-64kb-devel
kernel-default-base
bpftool
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-headers
kernel-extra-modules
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel
python3-perf-debuginfo
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-6.17 (Ubuntu package)
linux-oracle-6.17 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP7-RT_Update_18-debugsource - update to 1-150700.1.5.1
kernel-livepatch-6_4_0-150700_7_67-rt-debuginfo - update to 1-150700.1.5.1
kernel-livepatch-6_4_0-150700_7_67-rt - update to 1-150700.1.5.1
kernel-livepatch-6_4_0-150700_53_73-default-debuginfo - update to 1-150700.15.3.4
kernel-livepatch-6_4_0-150700_53_73-default - update to 1-150700.15.3.4
kernel-livepatch-SLE15-SP7_Update_19-debugsource - update to 1-150700.15.3.4
kernel-rt-devel - update to 6.4.0-150700.7.67.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.67.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
kernel-syms-rt - update to 6.4.0-150700.7.67.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
kernel-rt-debugsource - update to 6.4.0-150700.7.67.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.67.1
dlm-kmp-rt - update to 6.4.0-150700.7.67.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.67.1
kernel-devel-rt - update to 6.4.0-150700.7.67.1
kernel-source-rt - update to 6.4.0-150700.7.67.1
kernel-rt - update to 6.4.0-150700.7.67.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
gfs2-kmp-rt - update to 6.4.0-150700.7.67.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.67.1
kernel-syms - update to 6.4.0-150700.53.73.1
kernel-macros - update to 6.4.0-150700.53.73.1
kernel-devel - update to 6.4.0-150700.53.73.1
kernel-source - update to 6.4.0-150700.53.73.1
kernel-docs - update to 6.4.0-150700.53.73.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.73.2
kernel-zfcpdump - update to 6.4.0-150700.53.73.2
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.73.2
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.73.2
kernel-default - update to 6.4.0-150700.53.73.2
kernel-64kb-debuginfo - update to 6.4.0-150700.53.73.2
kernel-obs-build-debugsource - update to 6.4.0-150700.53.73.2
ocfs2-kmp-default - update to 6.4.0-150700.53.73.2
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.73.2
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.73.2
dlm-kmp-default - update to 6.4.0-150700.53.73.2
cluster-md-kmp-default - update to 6.4.0-150700.53.73.2
gfs2-kmp-default - update to 6.4.0-150700.53.73.2
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.73.2
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.73.2
kernel-obs-build - update to 6.4.0-150700.53.73.2
kernel-64kb-debugsource - update to 6.4.0-150700.53.73.2
kernel-azure-debugsource - update to 6.4.0-150700.53.73.2
kernel-azure-devel - update to 6.4.0-150700.53.73.2
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.73.2
kernel-azure-debuginfo - update to 6.4.0-150700.53.73.2
kernel-azure - update to 6.4.0-150700.53.73.2
kernel-default-livepatch - update to 6.4.0-150700.53.73.2
kernel-default-livepatch-devel - update to 6.4.0-150700.53.73.2
kernel-default-extra - update to 6.4.0-150700.53.73.2
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.73.2
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.73.2
reiserfs-kmp-default - update to 6.4.0-150700.53.73.2
kernel-default-debugsource - update to 6.4.0-150700.53.73.2
kernel-default-debuginfo - update to 6.4.0-150700.53.73.2
kernel-default-devel - update to 6.4.0-150700.53.73.2
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.73.2
kernel-64kb - update to 6.4.0-150700.53.73.2
kernel-64kb-devel - update to 6.4.0-150700.53.73.2
kernel-default-base - update to 6.4.0-150700.53.73.2.150700.17.41.4
bpftool - update to 6.6.0-145.3.15.146
python3-perf - update to 6.6.0-145.3.15.146
perf-debuginfo - update to 6.6.0-145.3.15.146
perf - update to 6.6.0-145.3.15.146
kernel-tools-devel - update to 6.6.0-145.3.15.146
kernel-tools-debuginfo - update to 6.6.0-145.3.15.146
kernel-tools - update to 6.6.0-145.3.15.146
kernel-source - update to 6.6.0-145.3.15.146
kernel-headers - update to 6.6.0-145.3.15.146
kernel-extra-modules - update to 6.6.0-145.3.15.146
kernel-devel - update to 6.6.0-145.3.15.146
kernel-debugsource - update to 6.6.0-145.3.15.146
kernel-debuginfo - update to 6.6.0-145.3.15.146
bpftool-debuginfo - update to 6.6.0-145.3.15.146
kernel - update to 6.6.0-145.3.15.146
python3-perf-debuginfo - update to 6.6.0-145.3.15.146
linux (Ubuntu package) - addressed in versions 6.8.0-137.137+fips1, 6.8.0-1034.35, 6.8.0-1047.51, 6.8.0-1060.63.1, 6.8.0-1060.63~22.04.1, 6.8.0-1060.68, 6.8.0-1062.63, 6.8.0-1062.63~22.04.1, 6.8.0-1062.65, 6.8.0-1062.65+fips1, 6.8.0-1063.70, 6.8.0-1063.70~22.04.1, 6.8.0-1064.72+fips1, 6.8.0-1064.72~22.04.1, 6.8.0-1065.73, 6.8.0-1065.73+fips1, 6.8.0-1065.73~22.04.1, 6.8.1-1057.58, 6.8.1-1057.58~22.04.1
linux-lowlatency (Ubuntu package) - addressed in versions 6.8.0-137.137.1, 6.8.0-137.137.1~22.04.1, 6.8.0-1031.32, 6.8.0-1059.62
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-138.138~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1059.62~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1062.65~22.04.1
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1062.66, 6.8.0-2051.53
linux-azure-6.17 (Ubuntu package) - addressed in versions 6.17.0-42.42+1, 6.17.0-1019.22, 6.17.0-1022.22, 6.17.0-1022.25, 6.17.0-1032.32
linux-oracle-6.17 (Ubuntu package) - update to 6.17.0-1020.20
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1031.31

• https://git.kernel.org/stable/c/043bd62f748bc9fd98154037aa598cffbd3c667c
• https://git.kernel.org/stable/c/7d7342a18fadcdb70a63b3c930dc63528ce51832
• https://git.kernel.org/stable/c/db25c42c2e1f9c0d136420fff5e5700f7e771a6f

• Improper update of reference count in Linux kernel mlx5 core driver
• openEuler 24.03 LTS SP3 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-azure-6.17
• Ubuntu update for linux
• Ubuntu update for linux-lowlatency
• Ubuntu update for linux-oracle-6.8
• Ubuntu update for linux-oracle-6.17
• Ubuntu update for linux-hwe-6.8
• Ubuntu update for linux-aws-6.8
• Ubuntu update for linux-nvidia-6.17
• Ubuntu update for linux-raspi