CVE-2026-43442
Description
A flaw was found in the Linux kernel's io_uring subsystem. An incorrect bounds check for 128-byte Submission Queue Entry (SQE) operations, when IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY, allows an unprivileged local user to remap logical SQE positions to arbitrary physical indices. This can lead to an out-of-bounds read, potentially disclosing sensitive information from kernel memory.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Read Memory; Modify Memory; Execute Unauthorized Code or Commands
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program's implicit security policy. This can often be used to subvert any other security service.
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Frequently Asked Questions
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