Out-of-bounds write in Linux kernel - CVE-2026-90226
Published: September 18, 2026
Vulnerability identifier: #VU151253
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90226
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to write past a user-supplied buffer.
The vulnerability exists due to improper validation of option-buffer length in nfc_llcp_getsockopt() when handling getsockopt calls with an option length smaller than four bytes. A local user can supply an option buffer with an option length smaller than four bytes to write past a user-supplied buffer.
The issue affects all five supported option names.
Affected software
Linux kernel
How to mitigate CVE-2026-90226
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526
- https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066
- https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd
- https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547
- https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67
- https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661
- https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3
- https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493