Out-of-bounds read in Linux kernel - CVE-2026-90257
Published: September 18, 2026
Vulnerability identifier: #VU151219
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90257
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in virtbt_setup_zephyr() when processing a status-only Read Build Information response from a Bluetooth virtio backend. A local user can provide a response containing only a status byte to disclose sensitive information.
Adjacent slab memory bytes may be exposed through the kernel log and the firmware-info debugfs file.
Affected software
Linux kernel
How to mitigate CVE-2026-90257
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/0e388d805233a883a31271676eae6031dfc9e898
- https://git.kernel.org/stable/c/502adc06ba76dee19c292ae4a07d74d202fe734d
- https://git.kernel.org/stable/c/54e9387eb7546eaa6f600220599d55740956ffc3
- https://git.kernel.org/stable/c/84ea9c99874804f5ca13f35bbc186ba93902f30f
- https://git.kernel.org/stable/c/be1e3df2c49c91b0a052c6563884e8d39bd768b2
- https://git.kernel.org/stable/c/d08c99abf06133a7829d46627e77e3315ca974d2
- https://git.kernel.org/stable/c/fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e