SB20260928126 - Use-after-free in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98060)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger a use-after-free condition.

The vulnerability exists due to improper locking in BPF rbtree comparison callback handling when executing a program-supplied comparison callback during an rbtree operation. A local user can release the root lock using resilient lock kfuncs during the callback to trigger a use-after-free condition.

Exploitation requires another CPU to remove and free the node referenced by the in-progress tree walk before it resumes.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/71930202a0a0c49f0a3b45b41907a074cb780266
• https://git.kernel.org/stable/c/7b7b8b5960102566bd625ae829d1f330c5b5d104
• https://git.kernel.org/stable/c/cc2e065ed206aecd9b94564779244f3ffb26e356