CVE-2026-49417
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk3th percentile — higher than 3% of all known CVEs
Summary
A use-after-free vulnerability was found in the Linux kernel audio drivers. When an audio device is closed, the audio buffer may be freed while the memory mapping remains valid, allowing access to freed kernel memory.
Risk Assessment
A local attacker can read and write kernel memory, leading to privilege escalation and potentially full system compromise. At minimum, a kernel crash (DoS) is possible.
Recommendation
Immediately update the Linux kernel to a version containing the fix for the use-after-free vulnerability in audio drivers. Until then, restrict access to /dev/dsp devices for unprivileged users.
Original NVD description (English source)
Second, the audio buffer backing a mapping could be freed when the device was closed even though the mapping remained valid. The freed memory could then be reused elsewhere while still accessible through the stale mapping. 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).