Use-after-free in Linux kernel - CVE-2026-68476

Vulnerability identifier: #VU143600

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-2026-68476

CWE-ID: CWE-416

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 use-after-free in __ip_vs_get_out_rt() handling of skb head reallocation in net/netfilter/ipvs/ip_vs_xmit.c when processing packets in ip_vs_bypass_xmit(). A local user can trigger skb head reallocation and subsequent use of a stale IP header pointer to cause a denial of service.

Linux kernel
openEuler
Ubuntu
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules
linux-nvidia-tegra (Ubuntu package)
linux (Ubuntu package)
linux-gke (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
python3-perf - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
perf - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-source - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
bpftool - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel - addressed in versions 6.6.0-145.1.24.161, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
linux (Ubuntu package) - addressed in versions 7.0.0-34.34~24.04.1, 7.0.0-34.34, 7.0.0-34.34.1, 7.0.0-1012.12~24.04.1, 7.0.0-1013.13~24.04.1, 7.0.0-1013.13, 7.0.0-1014.14, 7.0.0-1020.20
linux-gke (Ubuntu package) - update to 7.0.0-1007.8
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1012.12~24.04.1
linux-gcp (Ubuntu package) - addressed in versions 7.0.0-1013.13~24.04.1, 7.0.0-1013.13, 7.0.0-1014.14
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/3fb7edd2018bb1ad0a68157383d9b9dac33dd645
• https://git.kernel.org/stable/c/a2f57827bf7c695b8c72dc4511cae8e86582369d
• https://git.kernel.org/stable/c/ac6ac3d35bfc0ade9d17d354c84e503a946ebdab
• https://git.kernel.org/stable/c/ad1e14710b360bda087ebf9fb82460eb5ef775de
• https://git.kernel.org/stable/c/e51687fc56c2e39ea6e9532925f1aabd4d529f61

• Use-after-free in Linux kernel netfilter ipvs
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• Ubuntu update for linux-oracle-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux-gke
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-azure