Stack-based buffer overflow in Linux kernel - CVE-2026-64539
Published: July 28, 2026
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
Vulnerability details
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.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64539
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1
External References
- 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