CVE-2026-31720
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);…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191eePatch
- https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273Patch
- https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1cPatch
- https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605Patch
- https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6cPatch
- https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426Patch
- https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8Patch
- https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.