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Vulnerability record · CVE-2026-31720 · published 1 May 2026

CVE-2026-31720: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_uac1_legacy: validate control request size f_audio_complete() copies req->length bytes into a 4-byte stack variable: u32 data = 0; memcpy(&data, req->buf, req->length); req->length is derived from the host-controlled USB request path, which can lead to a stack out-of-bounds write. Validate req->actual against the expected payload size for the supported control selectors and decode only the expected amount of data. This avoids copying a host-influenced length into a fixed-size stack object.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_uac1_legacy: validate control request size f_audio_complete() copies req->length bytes into a 4-byte stack variable: u32 data = 0; memcpy(&data, req->buf, req->length); req->length is derived from the host-controlled USB request path, which can lead to a stack out-of-bounds write. Validate req->actual against the expected payload size for the supported control selectors and decode only the expected amount of data. This avoids copying a host-influenced length into a fixed-size stack object.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee Patch
https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273 Patch
https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c Patch
https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605 Patch
https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c Patch
https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426 Patch
https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8 Patch
https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31720), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.