SB20260815136 - NULL pointer dereference in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-74335)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/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 a NULL pointer dereference in bpf_task_from_vpid() when processing network packets in cgroup_skb programs while the current task is exiting. A remote attacker can send network traffic that triggers the vulnerable BPF helper path to cause a denial of service.

The issue occurs in softirq context if execution interrupts a task after its thread_pid has been cleared during process exit.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/50dff00615522f3ec03449680ca23beb4cfc549c
• https://git.kernel.org/stable/c/a4c95b6221cb2972a94ed72663c09bd5b0b6dea4
• https://git.kernel.org/stable/c/b7474f4432dd9559ada03b01a8cd3472cd02c61d