What’s Vulnerable › Vulnerabilities

CVE-2022-48770: bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-20 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack() task_pt_regs() can return NULL on powerpc for kernel threads. This is then used in __bpf_get_stack() to check for user mode, resulting in a kernel oops. Guard against this by checking return value of task_pt_regs() before trying to obtain the call chain.

Affected products

• Linux kernel: from 5.9 before 5.10.96; from 5.11 before 5.15.19; from 5.16 before 5.16.5; 5.17-rc1 — fixed in 5.10.96, 5.15.19, 5.16.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.96, 5.15.19, 5.16.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0bcd484587b3b3092e448d27dc369e347e1810c3
• https://git.kernel.org/stable/c/b82ef4985a6d05e80f604624332430351df7b79a
• https://git.kernel.org/stable/c/b992f01e66150fc5e90be4a96f5eb8e634c8249e
• https://git.kernel.org/stable/c/ff6bdc205fd0a83bd365405d4e31fb5905826996
• https://git.kernel.org/stable/c/0bcd484587b3b3092e448d27dc369e347e1810c3
• https://git.kernel.org/stable/c/b82ef4985a6d05e80f604624332430351df7b79a
• https://git.kernel.org/stable/c/b992f01e66150fc5e90be4a96f5eb8e634c8249e
• https://git.kernel.org/stable/c/ff6bdc205fd0a83bd365405d4e31fb5905826996

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