CVE-2026-93808 (GCVE-0-2026-93808)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:02 – Updated: 2026-09-25 12:43
VLAI
Title
ALSA: usb-audio: caiaq: validate EP1 reply lengths
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: caiaq: validate EP1 reply lengths usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then reads command-specific fixed items from the same URB buffer. Several paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that urb->actual_length contains those bytes. Add per-command length checks, use a payload length derived from the bytes after the command byte for the control-state copy, and reject short analog input payloads before the input helper reads fixed offsets from the EP1 reply.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c , < af8a172c4f71ac30d625f2966d2389a7fa872819 (git)
Affected: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c , < 74f3c639f64fa5da4e1613149798b5089bce2807 (git)
Affected: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c , < aba30af07d4fe499b50209801eba9da8a815522f (git)
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Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: caiaq: validate EP1 reply lengths\n\nusb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then\nreads command-specific fixed items from the same URB buffer. Several\npaths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that\nurb-\u003eactual_length contains those bytes.\n\nAdd per-command length checks, use a payload length derived from the\nbytes after the command byte for the control-state copy, and reject short\nanalog input payloads before the input helper reads fixed offsets from\nthe EP1 reply."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-25T12:43:16.139Z",
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    "dateReserved": "2026-09-18T17:59:28.790Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: caiaq: validate EP1 reply lengths\n\nusb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then\nreads command-specific fixed items from the same URB buffer. Several\npaths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that\nurb-\u003eactual_length contains those bytes.\n\nAdd per-command length checks, use a payload length derived from the\nbytes after the command byte for the control-state copy, and reject short\nanalog input payloads before the input helper reads fixed offsets from\nthe EP1 reply."
          }
        ],
        "id": "CVE-2026-93808",
        "lastModified": "2026-09-25T13:17:21.670",
        "metrics": {},
        "published": "2026-09-24T17:17:13.797",
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        "vulnStatus": "Received"
      }
    }
  }
}



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