CVE-2026-64490 (GCVE-0-2026-64490)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-08-17 04:56
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ALSA: virtio: Validate control metadata from the device
virtio-snd control handling trusts the device-provided control type and
value count returned by the device.
That metadata is then used directly to index g_v2a_type_map[] in
virtsnd_kctl_info(), and to size loops and memcpy() operations in
virtsnd_kctl_get() and virtsnd_kctl_put() against fixed-size
virtio_snd_ctl_value and snd_ctl_elem_value arrays.
A buggy or malicious device can therefore trigger out-of-bounds access by
advertising an invalid control type or an oversized value count.
Validate control type and count once in virtsnd_kctl_parse_cfg(), before
querying enumerated items or exposing the control to ALSA.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"sound/virtio/virtio_kctl.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"versionType": "git"
},
{
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"status": "affected",
"version": "d6568e3de42dd971a1356f7ba581e6600d53f0a0",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"sound/virtio/virtio_kctl.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
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"nodes": [
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"versionEndExcluding": "6.12.96",
"versionStartIncluding": "6.9",
"vulnerable": true
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{
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{
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{
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}
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"negate": false,
"operator": "OR"
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: virtio: Validate control metadata from the device\n\nvirtio-snd control handling trusts the device-provided control type and\nvalue count returned by the device.\n\nThat metadata is then used directly to index g_v2a_type_map[] in\nvirtsnd_kctl_info(), and to size loops and memcpy() operations in\nvirtsnd_kctl_get() and virtsnd_kctl_put() against fixed-size\nvirtio_snd_ctl_value and snd_ctl_elem_value arrays.\n\nA buggy or malicious device can therefore trigger out-of-bounds access by\nadvertising an invalid control type or an oversized value count.\n\nValidate control type and count once in virtsnd_kctl_parse_cfg(), before\nquerying enumerated items or exposing the control to ALSA."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The malformed metadata arrives through a locally attached virtio-snd device/backend and reaches vulnerable ALSA callbacks through local control operations. No routable network path or physical attachment is required.\nAC:L - The backend directly controls the type, count, access flags, and returned values, allowing deterministic oversized loops or copies without a race. Repeated control notifications and operations permit reliable triggering and heap grooming.\nPR:N - A malicious virtio backend supplies metadata during device initialization without guest authentication or capability checks. Standard OSS mixer registration or an automatically running audio service can subsequently access the control without the attacker holding guest credentials.\nUI:N - No human action is required because OSS mixer construction and normal audio-service enumeration can query or operate newly registered controls automatically. The backend can also generate control-change notifications to provoke further accesses.\nS:U - The vulnerable driver and corrupted kernel memory are within the same guest-kernel security authority. This is host-to-guest device exploitation, not a guest-to-host escape or IOMMU-boundary bypass.\nC:H - Oversized read operations copy data beyond the fixed 512-byte response into the userspace-returned ALSA value structure, exposing adjacent kernel heap contents. The unchecked type-map index also provides a device-selected out-of-bounds kernel read.\nI:H - Oversized INTEGER64, ENUMERATED, and BYTES write operations copy control values beyond the 512-byte virtio request payload into adjacent kernel heap objects. This controlled heap corruption can plausibly provide arbitrary modification or control-flow hijacking.\nA:H - Invalid type indices, enormous loops or memcpy lengths, and resulting heap corruption can cause an immediate kernel fault, oops, panic, or hang. The malicious backend can trigger the condition repeatedly."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:56:38.207Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3243563f99ef5d3949b934bd6390a5679405d0e1"
},
{
"url": "https://git.kernel.org/stable/c/5da9742de22db0dbaa8d414214ab5e1bedde00f9"
},
{
"url": "https://git.kernel.org/stable/c/21584672fd699abe1768241d6c501b2de6139b6a"
},
{
"url": "https://git.kernel.org/stable/c/c77a6cbb36ff8cbc1f084d94f8dcda5250935271"
}
],
"title": "ALSA: virtio: Validate control metadata from the device",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64490",
"datePublished": "2026-07-25T08:51:48.877Z",
"dateReserved": "2026-07-19T15:36:31.792Z",
"dateUpdated": "2026-08-17T04:56:38.207Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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