SB20260816202 - Use-after-free in Linux kernel dibs driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-74513)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in dibs loopback DMB handling in drivers/dibs/dibs_loopback.c when performing concurrent loopback attach, detach, or unregister operations. A local user can trigger racing reference count operations on a dmb_node to cause a denial of service.

The issue arises from a race window between hash table lookup and refcount operations on dmb_node.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/48c073f88c93707089a4214f21cb4c3de5aea6e4
• https://git.kernel.org/stable/c/a10ea943356b9d70c5616a0a06f6fa97cfdaccb1
• https://git.kernel.org/stable/c/c0837aeace96152d14b17fdd19d70102b6631a7d