cve-2026-31525

About this tag
CVE-2026-31525 is a Linux kernel vulnerability in the BPF interpreter, specifically a signed 32-bit division and modulo bug involving S32_MIN and the abs() macro. The flaw causes a mismatch between the BPF interpreter and the verifier, leading to undefined behavior that can be exploited for out-of-bounds map value access. The fix introduces a safe abs_s32() helper to handle the edge case correctly. This is a math bug with security implications, not a typical memory corruption issue, but it is serious enough that kernel security teams should prioritize patching. Discussions on WindowsForum cover the technical details, the nature of the bug, and the upstream patch.

  1. CVE-2026-31525: Fix abs() S32_MIN math bug in Linux BPF interpreter

    In the Linux kernel, CVE-2026-31525 has exposed a subtle but serious correctness flaw in the BPF interpreter’s signed 32-bit division and modulo paths. The issue is not a classic memory corruption bug; it is a math bug with security consequences, triggered when the interpreter handles S32_MIN...
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    • bpf interpreter cve-2026-31525 ebpf security linux kernel
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    • Forum: Security Alerts

  2. CVE-2026-31525: Linux BPF Signed Division Bug Causing Verifier/Interpreter Mismatch

    The Linux kernel’s BPF interpreter has a newly disclosed flaw, tracked as CVE-2026-31525, that exposes a subtle but important mismatch between the interpreter and the verifier when handling signed 32-bit division and modulo on INT_MIN. The bug is not a dramatic memory corruption primitive on its...
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    • cve-2026-31525 kernel security linux bpf verifier mismatch
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    • Forum: Security Alerts