CVE-2025-40050
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-28

Last updated on: 2025-10-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Skip scalar adjustment for BPF_NEG if dst is a pointer In check_alu_op(), the verifier currently calls check_reg_arg() and adjust_scalar_min_max_vals() unconditionally for BPF_NEG operations. However, if the destination register holds a pointer, these scalar adjustments are unnecessary and potentially incorrect. This patch adds a check to skip the adjustment logic when the destination register contains a pointer.
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Meta Information
Published
2025-10-28
Last Modified
2025-10-30
Generated
2026-06-16
AI Q&A
2025-10-28
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40050
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) verifier incorrectly applying scalar adjustments during BPF_NEG operations when the destination register is a pointer. The verifier was calling functions to adjust scalar values even when the destination was a pointer, which is unnecessary and could lead to incorrect behavior. The fix involves adding a check to skip these scalar adjustments if the destination register holds a pointer.

Impact Analysis

The vulnerability could cause incorrect behavior in the BPF verifier when handling pointer registers during BPF_NEG operations. This might lead to unexpected or incorrect kernel behavior, potentially affecting system stability or security, depending on how BPF programs are used on the system.

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