SB2026041417 - Use-after-free in Linux kernel net bonding driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-31419)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to a use-after-free in bond_xmit_broadcast() when transmitting broadcast packets during concurrent slave enslave or release operations. A local user can trigger concurrent network interface state changes and packet transmission to cause a denial of service.

The issue arises because the determination of the last slave can change during RCU-protected iteration, leading to double consumption and double free of the original skb.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16
• https://git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c
• https://git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd