Race condition in Linux kernel - CVE-2026-90091

Vulnerability identifier: #VU151393

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90091

CWE-ID: CWE-362

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 race condition in the L2CAP socket cleanup handler when concurrent L2CAP socket cleanup and channel teardown occur. A local user can trigger concurrent socket cleanup and channel teardown to cause a denial of service.

Linux kernel
Debian Linux
openEuler
Ubuntu
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 (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/32a7bc6e93be36b37fe61f351d312d358195bd61
• https://git.kernel.org/stable/c/4f8c63fe0097c9f6ea34409f82f79b3894903d91
• https://git.kernel.org/stable/c/61d5ddbd524c715b224cbe7e9f01da4e05098b19
• https://git.kernel.org/stable/c/66d6ef18548ae6d7dd452b84115fc82c0a73a4ea
• https://git.kernel.org/stable/c/7c7ac736b50fa259ed1bdddc18d79523f07c0442
• https://git.kernel.org/stable/c/827de6bd2865b22aaabd554540def3b8a33018ab

• Race condition in Linux kernel bluetooth
• 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