CVE-2025-39990
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-15

Last updated on: 2025-10-16

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Check the helper function is valid in get_helper_proto kernel test robot reported verifier bug [1] where the helper func pointer could be NULL due to disabled config option. As Alexei suggested we could check on that in get_helper_proto directly. Marking tail_call helper func with BPF_PTR_POISON, because it is unused by design. [1] https://lore.kernel.org/oe-lkp/[email protected]
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Meta Information
Published
2025-10-15
Last Modified
2025-10-16
Generated
2026-06-16
AI Q&A
2025-10-15
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39990
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves the BPF (Berkeley Packet Filter) subsystem where a helper function pointer could be NULL due to a disabled configuration option. The issue was that the verifier did not properly check if the helper function was valid in the get_helper_proto function. The fix involved adding a check to ensure the helper function pointer is valid and marking the tail_call helper function pointer with BPF_PTR_POISON since it is unused by design.

Impact Analysis

If exploited, this vulnerability could potentially cause the kernel verifier to behave incorrectly, possibly leading to kernel instability or security issues related to BPF programs. Since the helper function pointer could be NULL, it might cause unexpected behavior or crashes when BPF programs are verified or executed.

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