CVE-2026-93808: Linux kernel · ALSA: usb-audio: caiaq: validate EP1 reply lengths
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel to validate EP1 reply lengths properly. Users should apply the updated kernel versions that include this patch. Since this is a kernel-level fix, upgrading to a patched kernel version is the recommended remediation.
Description
A vulnerability in the Linux kernel's ALSA usb-audio caiaq driver was resolved by adding validation for EP1 reply lengths. The issue involved insufficient checks on the length of data read from USB request blocks (URBs), potentially leading to out-of-bounds reads. The fix ensures per-command length checks and rejects short payloads before processing.
References
- ubuntu.com/security/CVE-2026-93808 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93808 (opens in a new tab)
- git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f (opens in a new tab)
- git.kernel.org/stable/c/af8a172c4f71ac30d625f2966d2389a7fa872819 (opens in a new tab)
- git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93808 (opens in a new tab)
- git.kernel.org/stable/c/319393151367e6626affedcdd4f7b7b0286f4246 (opens in a new tab)
- git.kernel.org/stable/c/7cc6b3745a0cea697c8d0684b3094f220281a08d (opens in a new tab)
- git.kernel.org/stable/c/91acd231f219452fa58285239f83945accad9513 (opens in a new tab)
- git.kernel.org/stable/c/add9328c91c195c494cd68a21b19e5e47a20d784 (opens in a new tab)