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NVD / CVE Program· CNA Linux

CVE-2026-93808: ALSA: usb-audio: caiaq: validate EP1 reply lengths

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 319393151367e6626affedcdd4f7b7b0286f4246, 74f3c639f64fa5da4e1613149798b5089bce2807, 7cc6b3745a0cea697c8d0684b3094f220281a08d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 319393151367e6626affedcdd4f7b7b0286f4246, 74f3c639f64fa5da4e1613149798b5089bce2807, 7cc6b3745a0cea697c8d0684b3094f220281a08d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: caiaq: validate EP1 reply lengths usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then reads command-specific fixed items from the same URB buffer. Several paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that urb->actual_length contains those bytes. Add per-command length checks, use a payload length derived from the bytes after the command byte for the control-state copy, and reject short analog input payloads before the input helper reads fixed offsets from the EP1 reply.

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2026-93808

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.22affected
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before 91acd231f219452fa58285239f83945accad9513affected · git
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before 7cc6b3745a0cea697c8d0684b3094f220281a08daffected · git
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before add9328c91c195c494cd68a21b19e5e47a20d784affected · git
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before 319393151367e6626affedcdd4f7b7b0286f4246affected · git
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before af8a172c4f71ac30d625f2966d2389a7fa872819affected · git
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before 74f3c639f64fa5da4e1613149798b5089bce2807affected · git
    • 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and later · before aba30af07d4fe499b50209801eba9da8a815522faffected · git
    • before 2.6.22not affected · semver
    • 5.10.271 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-93806Sep 24, 2026 · wifi: cfg80211: validate assoc response length before status and IE access
    35Monitor
  • ← EarlierCVE-2026-93807Sep 24, 2026 · wifi: rsi: avoid reading TKIP MIC keys for non-TKIP ciphers
    0Monitor
  • Later →CVE-2026-93810Sep 24, 2026 · cachefiles: Fix double fput
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux319393151367e6626affedcdd4f7b7b0286f4246Vendor (CNA)
Linux Linux74f3c639f64fa5da4e1613149798b5089bce2807Vendor (CNA)
Linux Linux7cc6b3745a0cea697c8d0684b3094f220281a08dVendor (CNA)
Linux Linux91acd231f219452fa58285239f83945accad9513Vendor (CNA)
Linux Linuxaba30af07d4fe499b50209801eba9da8a815522fVendor (CNA)
Linux Linuxadd9328c91c195c494cd68a21b19e5e47a20d784Vendor (CNA)
Linux Linuxaf8a172c4f71ac30d625f2966d2389a7fa872819Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records