Use-after-free in Linux kernel - CVE-2026-89988

Vulnerability identifier: #VU150306

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89988

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to execute arbitrary code, escalate privileges, disclose sensitive information, or cause a denial of service.

The vulnerability exists due to a use-after-free in the kprobe blacklist traversal function __within_kprobe_blacklist() when concurrently checking a kprobe blacklist entry during module unloading. A local user can trigger concurrent blacklist traversal and entry removal to dereference freed memory.

The blacklist traversal can occur in atomic or non-preemptible contexts.

Linux kernel
Debian Linux
openEuler
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
bpftool
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
kernel
linux (Debian package)

Install security update from vendor's repository.

linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1038.42
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
bpftool - update to 5.10.0-335.0.0.236
python3-perf-debuginfo - update to 5.10.0-335.0.0.236
python3-perf - update to 5.10.0-335.0.0.236
perf-debuginfo - update to 5.10.0-335.0.0.236
perf - update to 5.10.0-335.0.0.236
kernel-tools-devel - update to 5.10.0-335.0.0.236
kernel-tools-debuginfo - update to 5.10.0-335.0.0.236
kernel-tools - update to 5.10.0-335.0.0.236
kernel-source - update to 5.10.0-335.0.0.236
kernel-headers - update to 5.10.0-335.0.0.236
kernel-devel - update to 5.10.0-335.0.0.236
kernel-debugsource - update to 5.10.0-335.0.0.236
kernel-debuginfo - update to 5.10.0-335.0.0.236
bpftool-debuginfo - update to 5.10.0-335.0.0.236
kernel - update to 5.10.0-335.0.0.236
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/0c4256196b3a105307e2235fbfd85e768bbcdd0f
• https://git.kernel.org/stable/c/518d9b5568bb06f86e4434f7a30faa9612ea91ad
• https://git.kernel.org/stable/c/5da247e4d1e8661d4d6f997101d59967e8994e32
• https://git.kernel.org/stable/c/630ed8734a02b992e8a97538179c2ece42c5210f
• https://git.kernel.org/stable/c/6e62cf983a2bd547e6bbd3f935539233e5f97f8f
• https://git.kernel.org/stable/c/8f406205003f741225f620f0e357ca0de71d45e3

• Use-after-free in Linux kernel kprobe blacklist traversal function __within_kprobe_blacklist()
• openEuler 22.03 LTS SP4 update for kernel
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra