SB20260812397 - Improper input validation in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-68136)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper state validation in skb_gro_receive_list() in the GRO subsystem when processing flush-marked aggregated packets. A remote attacker can send specially crafted network traffic to cause a denial of service.

The issue can corrupt the frag_list chain and later trigger a kernel panic when skb_segment() processes the malformed packet state.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/107e1a469f53a2a70874f3f12bf6fcd23925da1d
• https://git.kernel.org/stable/c/a4dfd46cc8f08a29c6183794790547d0945f3d45
• https://git.kernel.org/stable/c/e751256486d0ded20f5a9f9863467f1dce65142f
• https://git.kernel.org/stable/c/fc0c0f7a207f0cd2d2aa725696c907f7d03af9e0