Out-of-bounds read in Linux kernel - CVE-2026-31393
Published: April 6, 2026
Vulnerability identifier: #VU124890
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31393
CWE-ID: CWE-125
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose adjacent memory contents.
The vulnerability exists due to an out-of-bounds read in l2cap_information_rsp() when processing a truncated L2CAP_INFO_RSP packet with a successful result. A remote attacker can send a specially crafted Bluetooth L2CAP response to disclose adjacent memory contents.
The issue occurs because the code reads response payload data beyond the validated fixed header length for L2CAP_IT_FEAT_MASK and L2CAP_IT_FIXED_CHAN cases.
How to mitigate CVE-2026-31393
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f
- https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0
- https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171
- https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2
- https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101
- https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9