usb: gadget: f_uac1_legacy: validate control request size

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-31720
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:34 UTC
Updated2026-05-06 20:58:09 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-787

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 557d1d4e862eccd0b74cc377b66de3e1e8d49605 git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 21b11e8581285c6f10ef43d05df349d445f24273 git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 0d41772d98dcaf6c17e875b7d0ea0154ae1191ee git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 c6da4fed7537aec19880c24f6c3a95065adb1406 git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8 git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 8e5eb1d6e6a3d7bbea9c92132d0cda5793176426 git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 26304d124e7f0383f8fe1168b5801a0ac7e16b1c git Not specified
CNA Linux Linux affected c6994e6f067cf0fc4c6cca3d164018b1150916f8 6e0e34d85cd46ceb37d16054e97a373a32770f6c git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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