Stack-based buffer overflow in Linux kernel - CVE-2026-93067
Published: September 18, 2026
Vulnerability identifier: #VU150945
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93067
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 stack-based buffer overflow.
The vulnerability exists due to improper validation of controller-reported AUX byte counts in tc_aux_transfer() and tc_aux_read_data() when handling AUX read transfers. A local user can trigger processing of an AUX read response that reports a byte count larger than requested to cause a stack-based buffer overflow.
The controller-reported byte count can be as high as 255 despite the 16-byte auxrdata stack buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-93067
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/33c0b072e31dee98a754d9bd01800359dfeb9e8f
- https://git.kernel.org/stable/c/424b762cc26d512e3e7421e57e41b4b55be2400b
- https://git.kernel.org/stable/c/57c567e0e8aa76f6e3e8f39d7f40c20bc37e76af
- https://git.kernel.org/stable/c/982caa744fce79d18f2920382aaeb0da821a6e73
- https://git.kernel.org/stable/c/9ff718df547372d70ca20ad8e66a3fb1300936b2
- https://git.kernel.org/stable/c/dd6274706bec30d005bff0587a4262d01dc2775a
- https://git.kernel.org/stable/c/ebf00c51c9ac9188e2806a2b842418805ee879be
- https://git.kernel.org/stable/c/ec6444a00c49e6c2b5e9a507272a28126677f9ee