SB20260828141 - Out-of-bounds read in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-80634)

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

CVSSv4: 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]

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in nft_dev_forward_path() when processing a malformed bridge path stack. A local user can trigger a bridge VLAN untag path condition to disclose sensitive information.

The issue is caused by an underflow of the num_encaps counter that can wrap its value to 255 and lead to reads past the end of the fixed-size info.encap[] stack buffer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2f55fa28011c97d6495d5787808db10a8c2d690d
• https://git.kernel.org/stable/c/e052f920773b73be49eb4d8702a9f85de7464363