SB20260815297 - Type Confusion in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Type Confusion (CVE-ID: CVE-2026-72429)

CWE-ID: CWE-843 - Type confusion

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to type confusion in the IPv6 IOAM dst cache handling in net/ipv6/ioam6_iptunnel.c when processing IOAM tunnel state that uses a dummy dst_entry. A local user can trigger the vulnerable code path to cause a denial of service.

The issue can lead to invalid pointer access because rt6_get_cookie() may read fields from the wrong object after treating a dst_entry as part of a struct rt6_info.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5a3b2ee1e96d0580a8ed8deda6dfa430604f9ab0
• https://git.kernel.org/stable/c/9ed19e11d2146076d117d51a940643990118449b
• https://git.kernel.org/stable/c/ea24f911ead85ba3d570a31e37c52b6c949f6928