CVE-2026-98742 (GCVE-0-2026-98742)
Vulnerability from cvelistv5
Published
2026-10-18 15:47
Modified
2026-10-30 12:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ALSA: seq: Serialize compat port-info ioctls
The native sequencer ioctl path serializes handler calls with
client->ioctl_mutex, but the translated port-info compat path invokes the
same handlers through snd_seq_kernel_client_ctl() without taking that
mutex.
This lets concurrent compat CREATE_PORT requests pass the port-count
check before any request reaches the serialized insertion. The computed
integer port index can then exceed the address field range and wrap to an
existing index. Subsequent subscriber teardown can resolve the duplicate
address to the wrong port and access a freed subscriber.
Take ioctl_mutex while dispatching converted port-info requests, matching
the native ioctl path. All translated port-info commands share this
helper, so their accesses to the client port state are serialized as
well.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: b3defb791b26ea0683a93a4f49c77ec45ec96f10 Version: d6693160906d55ba376bf0b88b7c129762170162 Version: 02cbce8576a31df8fca54aaec91ee081076bd79d Version: 6aab3aa52366a0051e5abf8aae4616c42053fd8e Version: f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c Version: 623e5c8ae32b39cc8baea83478695dc624935318 Version: e4ff9f294629b65df3f7982cd4faf86b2856b9d7 Version: c3162384aed4cfe3f1a1f40041f3ba8cd7704d88 Version: 3.2.99 ≤ Version: 3.16.54 ≤ Version: 3.18.94 ≤ Version: 4.1.50 ≤ Version: 4.4.115 ≤ Version: 4.9.78 ≤ Version: 4.14.15 ≤ |
||
{
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{
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"status": "affected",
"version": "3.16.54",
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{
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{
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{
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]
},
{
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"programFiles": [
"sound/core/seq/seq_compat.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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},
{
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{
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},
{
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},
{
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"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Serialize compat port-info ioctls\n\nThe native sequencer ioctl path serializes handler calls with\nclient-\u003eioctl_mutex, but the translated port-info compat path invokes the\nsame handlers through snd_seq_kernel_client_ctl() without taking that\nmutex.\n\nThis lets concurrent compat CREATE_PORT requests pass the port-count\ncheck before any request reaches the serialized insertion. The computed\ninteger port index can then exceed the address field range and wrap to an\nexisting index. Subsequent subscriber teardown can resolve the duplicate\naddress to the wrong port and access a freed subscriber.\n\nTake ioctl_mutex while dispatching converted port-info requests, matching\nthe native ioctl path. All translated port-info commands share this\nhelper, so their accesses to the client port state are serialized as\nwell."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:39:16.216Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/14e178c60ba1cea49186fcfccac93d66aa94e9e0"
},
{
"url": "https://git.kernel.org/stable/c/4980768c5d092493be0deb20d1ee86aa661466f8"
},
{
"url": "https://git.kernel.org/stable/c/2c0cce3a5a660270d65729b0f318d4e01470479d"
},
{
"url": "https://git.kernel.org/stable/c/2db234e163f0d211b69a4eebbec8aacc5a54a80e"
},
{
"url": "https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502c"
},
{
"url": "https://git.kernel.org/stable/c/fc5c52848e405b6efb073db5035bb9ebaed11ec4"
},
{
"url": "https://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341"
},
{
"url": "https://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650"
}
],
"title": "ALSA: seq: Serialize compat port-info ioctls",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-98742",
"datePublished": "2026-10-18T15:47:27.137Z",
"dateReserved": "2026-09-25T10:25:14.367Z",
"dateUpdated": "2026-10-30T12:39:16.216Z",
"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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