Signed Integer Vulnerability in Linux Kernel Affecting Division and Modulo Operations
CVE-2026-31525
Key Information:
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What is CVE-2026-31525?
In the Linux kernel, a flaw in the BPF interpreter's handling of signed 32-bit division and modulo operations can lead to undefined behavior. Specifically, the kernel's abs() macro fails when applied to the minimum value of a signed 32-bit integer, resulting in incorrect calculations and potential out-of-bounds access. This vulnerability arises from a mismatch in the verifier's calculation and the interpreter's handling of certain integer operations. A patch has been introduced to correctly manage these operations and prevent exploitation.
Affected Version(s)
Linux ec0e2da95f72d4a46050a4d994e4fe471474fd80 < 694ea55f1b1c74f9942d91ec366ae9e822422e42
Linux ec0e2da95f72d4a46050a4d994e4fe471474fd80 < 9ab1227765c446942f290c83382f0b19887c55cf
Linux ec0e2da95f72d4a46050a4d994e4fe471474fd80
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.