SB20260928217 - Integer overflow in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-97984)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a kernel warning.

The vulnerability exists due to an integer overflow in IPv6 UDP socket cork handling when sending a large UDP payload with IPv6 path MTU discovery set to IPV6_PMTUDISC_DO or IPV6_PMTUDISC_PROBE over a network device with an unusually large MTU. A local privileged user can configure the device MTU and send a crafted UDP payload to cause a kernel warning.

The issue is limited to UDP sockets; raw IPv6 sockets can send UDP jumbograms.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0ae10b6be49b425827659b23bcce498f80eb7182
• https://git.kernel.org/stable/c/1d56a00ec91f2885c64ea5b8cea18cb746b91bbb
• https://git.kernel.org/stable/c/ce66352d3eb21825410af8b91db7cc4bb8e22c98
• https://git.kernel.org/stable/c/e01b7c176d9af2b7c22bb3fe12cf9a7904f99fdc