SB20260827129 - Out-of-bounds read in Linux kernel netfilter ipvs

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-74747)

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.

The vulnerability exists due to an out-of-bounds read in ip_vs_nat_icmp() when processing embedded IP headers in ICMP packets after copying header data into the skb head. A local user can modify the ihl field to trigger out-of-bounds access and disclose sensitive information, modify data, or cause a denial of service.

The issue occurs because the embedded header length was not revalidated after reading data from skb fragments.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5365f012451fce2453f13a568dcb72ea534c1e4d
• https://git.kernel.org/stable/c/d93660df4dd1d116f608ada4a29a80a5d6f0a6ed