CVE-2026-49417 Details
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).
A vulnerability in the FreeBSD sound driver allows unprivileged local users to read and write kernel memory, potentially leading to privilege escalation and full control of the affected system. This issue arises from two memory-safety errors in the driver's support for memory mapping. The first error allows a mapping to extend beyond the audio buffer into unrelated kernel memory, while the second error involves the premature freeing of memory that is still accessible through a valid mapping. Both issues can be exploited on systems with an audio device, causing at least a denial-of-service by crashing the kernel.
Users can upgrade to a supported FreeBSD stable or release/security branch dated after the correction date. Instructions for updating via the pkg utility, freebsd-update utility, or by applying a source code patch are available in the FreeBSD Security Advisory FreeBSD-SA-26:27.sound.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://security.freebsd.org/advisories/FreeBSD-SA-26:27.sound.asc | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| freebsd freebsd | 14.3 - 14.3 p1 14.3 p10 14.3 p11 14.3 p12 14.3 p13 14.3 p14 14.3 p2 14.3 p3 14.3 p4 14.3 p5 14.3 p6 14.3 p7 14.3 p8 14.3 p9 14.4 - 14.4 p1 14.4 p2 14.4 p3 14.4 p4 14.4 p5 15.0 - 15.0 p1 15.0 p2 15.0 p3 15.0 p4 15.0 p5 15.0 p6 15.0 p7 15.0 p8 15.0 p9 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 1, 2026 | Initial Analysis | [email protected] |
| Jun 30, 2026 | CVE Modified | CISA-ADP |
| Jun 29, 2026 | CVE Modified | CISA-ADP |
| Jun 27, 2026 | New CVE Received | [email protected] |