CVE-2026-31602
Description
A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) ctxfi driver. When handling memory allocations, the ct_vm_map() function can attempt to access memory beyond its allocated boundaries if aggregate memory allocations exceed a single page limit. This out-of-bounds access triggers a page fault, which can lead to a system crash. A local attacker could exploit this vulnerability to cause a Denial of Service (DoS) on the affected system.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
Frequently Asked Questions
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