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).

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This CVE is not in the KEV list.

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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
FreeBSD FreeBSD unknown
Version Status Constraints
15.0-RELEASE affected < p10
14.4-RELEASE affected < p6
14.3-RELEASE affected < p15

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Fixes

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Workaround

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References
Link Providers
https://security.freebsd.org/advisories/FreeBSD-SA-26:27.sound.asc cve-icon
History

Sat, 27 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
Description 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).
Title Multiple vulnerabilities in the sound(4) mmap path
Weaknesses CWE-125
CWE-190
CWE-681
CWE-787
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-06-27T08:50:56.185Z

Reserved: 2026-05-11T16:27:44.892Z

Link: CVE-2026-45258

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-27T10:30:14Z

Weaknesses