CVE-2026-49417 Multiple vulnerabilities in the sound(4) mmap path
An unprivileged local user can exploit a use-after-free in the sound driver to read/write kernel memory, leading to privilege escalation or system crash.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49417?
CVE-2026-49417 is a high-severity use after free vulnerability in Freebsd Freebsd, published on 27 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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).
Weakness: CWE-416
Which versions are affected by CVE-2026-49417?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49417?
No fix has been published for CVE-2026-49417 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-49417 being exploited?
There is no known exploitation of CVE-2026-49417 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.