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CVE-2026-98742

ALSA: seq: Serialize compat port-info ioctls

CVSS score

—

EPSS probability

—

Risk score

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Published

15 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

Linux Kernel ALSA Sequencer Race Condition Vulnerability

Sources read

2

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

A race condition vulnerability exists in the Linux kernel ALSA sequencer component due to missing locking during compat port-info ioctl requests. Concurrent CREATE_PORT requests can bypass port-count checks, leading to index wrapping, incorrect port resolution, and access to a freed subscriber.

Why does it matter?

This vulnerability can lead to memory safety issues resulting from synchronization discrepancies between native and compat ioctl paths. Proper mutex implementation ensures client port state consistency.

What should be done?

  • Follow vendor advisories and stable kernel updates
  • Ensure ioctl_mutex is acquired during converted port-info requests
Chain of evidence and sources2 verified claims

Yerel sıralayıcı ioctl yolu handler çağrılarını client->ioctl_mutex ile serileştirirken çevrilmiş port-info compat yolu mutex almaz.

S0 · daybreach-canonicalS1 · cvelistS2 · nvd

Eşzamanlı compat CREATE_PORT istekleri port sayımı kontrolünü geçerek indeksin sarmasına ve serbest bırakılmış aboneye erişilmesine yol açabilir.

S0 · daybreach-canonicalS1 · cvelistS2 · nvd
Show the technical text from the sources

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.

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-98742 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1linuxLinux View
2linuxLinux View
Total affected vendors: 1|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
The sources have not yet published a verified CVSS metric.

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

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Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98742 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98742 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Official Sources and Advisories

https://git.kernel.org/stable/c/413211dd31cb2ef2fc99fb0aa1a037a97509502cvendor-advisoryhttps://git.kernel.org/stable/c/fc5c52848e405b6efb073db5035bb9ebaed11ec4vendor-advisoryhttps://git.kernel.org/stable/c/702d92f361f65d9698c473c7599d471395dc4341vendor-advisoryhttps://git.kernel.org/stable/c/95b2e0361c88753afa030c10698be0a1a5b67650vendor-advisory

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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