VulnerabilityPublished 18 Oct 2026

CVE-2026-98741: Linux kernel · ALSA: ua101: reject mismatched capture/playback packet sizes

Source GCVE Database

Authoritative record:CVE-2026-98741

Not known to be exploited · fixed in fd3a7bf0d988b0878a1957df150edb35f81db87e : patch Linux kernel soon.

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fd3a7bf0d988b0878a1957df150edb35f81db87e, eb0c7fda59cf650076f8ed5b949a6c8441aa3606, ada5ded765f059a6e3036e69ca350449442af0fc +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-3vm7-3m85-mm4q

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 63978ab3e3e963db28093b53bb4598f2702e1ad7, < fd3a7bf0d988b0878a1957df150edb35f81db87e	Fixed in fd3a7bf0d988b0878a1957df150edb35f81db87e
LinuxLinux	Affected ≥ 63978ab3e3e963db28093b53bb4598f2702e1ad7, < eb0c7fda59cf650076f8ed5b949a6c8441aa3606	Fixed in eb0c7fda59cf650076f8ed5b949a6c8441aa3606
LinuxLinux	Affected ≥ 63978ab3e3e963db28093b53bb4598f2702e1ad7, < ada5ded765f059a6e3036e69ca350449442af0fc	Fixed in ada5ded765f059a6e3036e69ca350449442af0fc
LinuxLinux	Affected ≥ 63978ab3e3e963db28093b53bb4598f2702e1ad7, < 4294fe57048594a9e158b61c967bb7f943cda477	Fixed in 4294fe57048594a9e158b61c967bb7f943cda477
LinuxLinux	Affected ≥ 63978ab3e3e963db28093b53bb4598f2702e1ad7, < 86f86e6fdedc33c5b8d38b9208b350f8accf57ee	Fixed in 86f86e6fdedc33c5b8d38b9208b350f8accf57ee
LinuxLinux	Affected =2.6.34	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to reject mismatched capture/playback packet sizes at probe time, preventing the out-of-bounds writes. Users should update to a Linux kernel version that includes this fix. No additional mitigation is required for genuine UA-101/UA-1000 hardware as they are unaffected.

Description

A vulnerability in the Linux kernel ALSA ua101 driver was resolved that involved mismatched capture and playback packet sizes. The driver failed to properly relate the maximum packet size and number of channels between capture and playback endpoints, leading to out-of-bounds memory writes during PCM node open operations. Genuine UA-101/UA-1000 hardware is unaffected due to proportional packet sizes. The issue was detected by KASAN as a slab-out-of-bounds write in start_usb_playback().

References

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