What’s Vulnerable › Vulnerabilities

CVE-2026-98019: bpf: mark a NULL call argument precise

• Severity: unknown
• 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: 2026-09-25 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: mark a NULL call argument precise check_func_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. check_helper_call() enforces second parameter of the bpf_get_local_storage() to be zero, w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Grouping these two into one patch, as they share the same fixes tag.

Affected products

• Linux kernel: 5.3 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1a3a10b030c96ea88868ccc060a16827c01eaa5a
• https://git.kernel.org/stable/c/627089c278df58749f25686c6a3caf7e181b5951
• https://git.kernel.org/stable/c/69a9ad004ccf5d45e534c7d503f47f643abe64b7
• https://git.kernel.org/stable/c/b1fe6379e401b8ce0f561cb4d84af2b70b4343c3
• https://git.kernel.org/stable/c/febbb66e682d8328f7c5bcbdd5e4291abab2e858

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