CVE-2026-74497

Kernel memory corruption via unclamped USB frame count

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds write in affected Linux kernel branches allows physically proximate attackers to corrupt kernel memory via a malicious USB audio device. During implicit-feedback playback, snd_usb_handle_sync_urb() multiplies an oversized sync-packet size by the sender stride and queues the resulting frame count without limiting it to ep->maxframesize. A connected malicious USB audio device and active playback are required; oversized queue entries cause kernel-buffer writes, information disclosure, and a kernel crash.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in affected Linux kernel branches allows physically proximate attackers to corrupt kernel memory via a malicious USB audio device. During implicit-feedback playback, snd_usb_handle_sync_urb() multiplies an oversized sync-packet size by the sender stride and queues the resulting frame count without limiting it to ep->maxframesize. A connected malicious USB audio device and active playback are required; oversized queue entries cause kernel-buffer writes, information disclosure, and a kernel crash.

The record

CVE
CVE-2026-74497
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <2db4535d6af79276a64449201c5be5feffb31c64
  2. Affected versionversion=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <53f0aa37eb945f3c983f61d12fc35eb33debb8a9
  3. Affected versionversion=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <56ac3e7c90f6b45969c3fd07a98fad760ffd6901
  4. Affected versionversion=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <8d7a30c50c2e58a6839634ed0acde14466d1dc61
  5. Affected versionversion=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <be97fea7451d758881b95af78e900dd0d58a382a
  6. Affected versionversion=3.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <2db4535d6af79276a64449201c5be5feffb31c64; version=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <53f0aa37eb945f3c983f61d12fc35eb33debb8a9; version=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <56ac3e7c90f6b45969c3fd07a98fad760ffd6901; version=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <8d7a30c50c2e58a6839634ed0acde14466d1dc61; version=28acb12014fb0c3e1edfdab1b1e3e266cf651550 <be97fea7451d758881b95af78e900dd0d58a382a; version=3.8

Published CVSS scores

8.4Linux CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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