CVE-2026-45258
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile — higher than 5% of all known CVEs
Summary
An integer overflow vulnerability was found in the dsp_mmap_single() function during validation of memory mapping requests. A large offset and length can cause the sum to wrap around, bypassing the check and allowing mapping beyond the audio buffer into unrelated kernel memory.
Risk Assessment
An unprivileged local user can read and write kernel memory, leading to privilege escalation and potentially full system compromise. At minimum, a kernel crash (DoS) is possible.
Recommendation
Apply the patch provided by the operating system vendor immediately. Until then, restrict access to /dev/dsp devices for unprivileged users.
Original NVD description (English source)
dsp_mmap_single() validated the requested mapping by checking the sum of the user-supplied offset and length against the buffer size. This addition could overflow, so that a large offset and length wrapped around and passed the check. The offset was then narrowed from 64 to 32 bits when converted to a buffer address, yielding a mapping that extended past the audio buffer into unrelated kernel memory. The /dev/dsp device nodes are world-accessible by default. On a system with an audio device, either issue allows an unprivileged local user to read and write kernel memory, which can be used to escalate privileges, potentially gaining full control of the affected system. At a minimum, an attacker can crash the kernel, resulting in a Denial of Service (DoS).