Out-of-bounds read in Linux kernel - CVE-2026-53078
Published: June 25, 2026
Vulnerability identifier: #VU135247
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53078
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in BPF sock_ops context field access handling when accessing ctx fields with the same destination and source register. A local user can trigger the flawed register handling to disclose sensitive information.
The issue occurs when the fullsock or locked_tcp_sock check is false, causing a stale ctx pointer to be retained.
How to mitigate CVE-2026-53078
Install security update from vendor's repository.