CVE-2026-98742
Received
Received - Intake
Race Condition in Linux Kernel ALSA Sequencer Compat Port-Info Handling
Vulnerability report for CVE-2026-98742, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | b3defb791b26ea0683a93a4f49c77ec45ec96f10 |
| Linux | Linux | b3defb791b26ea0683a93a4f49c77ec45ec96f10 |
| Linux | Linux | b3defb791b26ea0683a93a4f49c77ec45ec96f10 |
| Linux | Linux | b3defb791b26ea0683a93a4f49c77ec45ec96f10 |
| Linux | Linux | d6693160906d55ba376bf0b88b7c129762170162 |
| Linux | Linux | 02cbce8576a31df8fca54aaec91ee081076bd79d |
| Linux | Linux | 6aab3aa52366a0051e5abf8aae4616c42053fd8e |
| Linux | Linux | f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c |
| Linux | Linux | 623e5c8ae32b39cc8baea83478695dc624935318 |
| Linux | Linux | e4ff9f294629b65df3f7982cd4faf86b2856b9d7 |
| Linux | Linux | c3162384aed4cfe3f1a1f40041f3ba8cd7704d88 |
| Linux | Linux | 3.2.99 |
| Linux | Linux | 3.16.54 |
| Linux | Linux | 3.18.94 |
| Linux | Linux | 4.1.50 |
| Linux | Linux | 4.4.115 |
| Linux | Linux | 4.9.78 |
| Linux | Linux | 4.14.15 |
| Linux | Linux | 4.15 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
