SB20261022407 - Improper input validation in Linux kernel netfilter ipvs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-98794)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 7.1 [CVSS:4.0/AV:A/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 on the local network to disrupt IPVS connection handling, potentially causing a denial of service.

The vulnerability exists due to improper validation of connection flags in the Linux kernel IPVS backup server when processing synchronization messages. A remote attacker on the local network can send crafted messages containing the NO_CPORT+TEMPLATE flag combination to make normal connection lookups match templates, or use the ONE_PACKET flag in protocol version 0 messages to create connections that are not hashed and are immediately dropped, potentially disrupting service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/45a93111835ccfea7d969ec73588e33745fd9834
• https://git.kernel.org/stable/c/55d033324f67a15ff56be6d38d6e87f644e0ed62
• https://git.kernel.org/stable/c/d7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0
• https://git.kernel.org/stable/c/f4cd1db7d421e82945713a36084bb0c35b75b27e
• https://git.kernel.org/stable/c/f96e91748f6304668fe647e686d199d7207d36f1