Stack-based buffer overflow in Linux kernel - CVE-2026-64539

Vulnerability identifier: #VU139831

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64539

CWE-ID: CWE-121

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 stack-based buffer overflow in eir_create_adv_data() in the Bluetooth EIR advertising data builder when constructing legacy advertising data for an LE-only controller. A local user can supply crafted advertising instance data to trigger a stack out-of-bounds write and cause a denial of service.

Exploitation requires CAP_NET_ADMIN and access to the legacy advertising path on an LE-only controller.

Linux kernel
Debian Linux
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
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-328.0.0.229
bpftool - update to 5.10.0-328.0.0.229
bpftool-debuginfo - update to 5.10.0-328.0.0.229
kernel-debuginfo - update to 5.10.0-328.0.0.229
kernel-debugsource - update to 5.10.0-328.0.0.229
kernel-devel - update to 5.10.0-328.0.0.229
kernel-headers - update to 5.10.0-328.0.0.229
kernel-source - update to 5.10.0-328.0.0.229
kernel-tools - update to 5.10.0-328.0.0.229
kernel-tools-debuginfo - update to 5.10.0-328.0.0.229
kernel-tools-devel - update to 5.10.0-328.0.0.229
perf - update to 5.10.0-328.0.0.229
perf-debuginfo - update to 5.10.0-328.0.0.229
python3-perf - update to 5.10.0-328.0.0.229
python3-perf-debuginfo - update to 5.10.0-328.0.0.229
linux (Debian package) - update to 6.12.100-1

• https://git.kernel.org/stable/c/09301f1fdf2aef8cce34d0c4650c30e7edb1ced9
• https://git.kernel.org/stable/c/0f0b6232af56441d0a2dcb173cc4f8d8aab39014
• https://git.kernel.org/stable/c/57077eeb586c42f124bc09e018449362223067b3
• https://git.kernel.org/stable/c/6f5fb689fdf80bdd143f22a502f9eb1f3c85e286
• https://git.kernel.org/stable/c/f1b4df9c260c51726da2e86e19322825fddeefd0

• Stack-based buffer overflow in Linux kernel bluetooth
• Debian update for linux
• openEuler 22.03 LTS SP4 update for kernel