SB2026111110 - Incorrect Pointer Scaling in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect Pointer Scaling (CVE-ID: CVE-2026-99285)

CWE-ID: CWE-468 - Incorrect Pointer Scaling

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause incorrect byte-order conversions and potentially alter nftables rule evaluation.

The vulnerability exists due to incorrect pointer scaling in the Linux kernel's nft_byteorder_eval() function when converting multiple 64-bit register values. A local privileged user can configure a multi-register byte-order expression to cause source reads to advance by four bytes instead of eight, producing incorrect conversion results that may affect rule evaluation.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3c5fb3a6c8118d15e60295e76fb5b879021eef43
• https://git.kernel.org/stable/c/bb061d3de41707415269be75ebf700efb03ec212
• https://git.kernel.org/stable/c/dc29c0478b8564feb9371e715b5a0016eb8903fd