CVE-2025-68783 (GCVE-0-2025-68783)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:28 – Updated: 2026-01-13 15:28
VLAI?
Title
ALSA: usb-mixer: us16x08: validate meter packet indices
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-mixer: us16x08: validate meter packet indices get_meter_levels_from_urb() parses the 64-byte meter packets sent by the device and fills the per-channel arrays meter_level[], comp_level[] and master_level[] in struct snd_us16x08_meter_store. Currently the function derives the channel index directly from the meter packet (MUB2(meter_urb, s) - 1) and uses it to index those arrays without validating the range. If the packet contains a negative or out-of-range channel number, the driver may write past the end of these arrays. Introduce a local channel variable and validate it before updating the arrays. We reject negative indices, limit meter_level[] and comp_level[] to SND_US16X08_MAX_CHANNELS, and guard master_level[] updates with ARRAY_SIZE(master_level).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d2bb390a2081a36ffe906724d2848d846f2aeb29 , < cde47f4ccad6751ac36b7471572ddf38ee91870c (git)
Affected: d2bb390a2081a36ffe906724d2848d846f2aeb29 , < 2f21a7cbaaa93926f5be15bc095b9c57c35748d9 (git)
Affected: d2bb390a2081a36ffe906724d2848d846f2aeb29 , < a8ad320efb663be30b794e3dd3e829301c0d0ed3 (git)
Affected: d2bb390a2081a36ffe906724d2848d846f2aeb29 , < eaa95228b8a56c4880a182c0350d67922b22408f (git)
Affected: d2bb390a2081a36ffe906724d2848d846f2aeb29 , < 5526c1c6ba1d0913c7dfcbbd6fe1744ea7c55f1e (git)
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    Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc3 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-mixer: us16x08: validate meter packet indices\n\nget_meter_levels_from_urb() parses the 64-byte meter packets sent by\nthe device and fills the per-channel arrays meter_level[],\ncomp_level[] and master_level[] in struct snd_us16x08_meter_store.\n\nCurrently the function derives the channel index directly from the\nmeter packet (MUB2(meter_urb, s) - 1) and uses it to index those\narrays without validating the range. If the packet contains a\nnegative or out-of-range channel number, the driver may write past\nthe end of these arrays.\n\nIntroduce a local channel variable and validate it before updating the\narrays. We reject negative indices, limit meter_level[] and\ncomp_level[] to SND_US16X08_MAX_CHANNELS, and guard master_level[]\nupdates with ARRAY_SIZE(master_level)."
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    "datePublished": "2026-01-13T15:28:57.609Z",
    "dateReserved": "2025-12-24T10:30:51.036Z",
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  }
}


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