SB2026102978 - Integer overflow in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-99191)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause incorrect IPv6 payload-length reporting, potentially disrupting packet processing by nf_tables, conntrack and sch_cake.

The vulnerability exists due to integer wraparound and incorrect handling of the zero payload-length marker in calipso_skbuff_setattr() when inserting or resizing CALIPSO options on IPv6 packets forwarded to a destination mapped to CALIPSO. A remote attacker can send traffic that forms oversized aggregated packets or crosses the IPv6 payload-length limit during labeling to cause downstream components to use an incorrect payload length.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1c9fcfca51e3c5cd46dd72a4da74d56eff183513
• https://git.kernel.org/stable/c/8070ed578b6b9134e045627fb745c887a806d46e
• https://git.kernel.org/stable/c/8ee0e03663826a76507048d58466b29321a57656