Use-after-free in Linux kernel - CVE-2026-74302

Vulnerability identifier: #VU142897

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-2026-74302

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 or execute arbitrary code.

The vulnerability exists due to use-after-free in hci_unregister_dev() when a timeout fires during device teardown. A local user can trigger device teardown and a timer callback to dereference freed memory to cause a denial of service or execute arbitrary code.

The freed memory may include the hdev->reset function pointer.

Linux kernel
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-331.0.0.232
bpftool - update to 5.10.0-331.0.0.232
bpftool-debuginfo - update to 5.10.0-331.0.0.232
kernel-debuginfo - update to 5.10.0-331.0.0.232
kernel-debugsource - update to 5.10.0-331.0.0.232
kernel-devel - update to 5.10.0-331.0.0.232
kernel-headers - update to 5.10.0-331.0.0.232
kernel-source - update to 5.10.0-331.0.0.232
kernel-tools - update to 5.10.0-331.0.0.232
kernel-tools-debuginfo - update to 5.10.0-331.0.0.232
kernel-tools-devel - update to 5.10.0-331.0.0.232
perf - update to 5.10.0-331.0.0.232
perf-debuginfo - update to 5.10.0-331.0.0.232
python3-perf - update to 5.10.0-331.0.0.232
python3-perf-debuginfo - update to 5.10.0-331.0.0.232

• https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644
• https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181
• https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540
• https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735

• Use-after-free in Linux kernel bluetooth
• openEuler 22.03 LTS SP4 update for kernel