SB20260816223 - Improper input validation in Linux kernel usb
Published: August 16, 2026
Security Bulletin ID
SB20260816223
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-74497)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows an attacker with physical access to cause a denial of service.
The vulnerability exists due to improper input validation in snd_usb_handle_sync_urb() when processing oversized USB sync packets in implicit-feedback mode. An attacker with physical access can connect a crafted USB device that sends oversized sync packets to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64
- https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9
- https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901
- https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61
- https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a