SB2026062588 - Out-of-bounds read in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-53078)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6
• https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8