Improper input validation in Linux kernel - CVE-2026-74455
Published: August 16, 2026
Vulnerability identifier: #VU143319
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74455
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to improper input validation in pcan_usb_fd_decode_buf() and CAN message decoding in the peak_usb USB CAN receive path when processing crafted uCAN records in a USB receive buffer. A local attacker can supply malformed record lengths to trigger kernel message rejection and cause a denial of service.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74455
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/2427ef427bdd78d862c7c76597bfd9eda88b81f1
- https://git.kernel.org/stable/c/2c8f08f3641a074da40acf05baa5a18ae2739260
- https://git.kernel.org/stable/c/6067c878e38d02a3d5c43497347e143f85c9064a
- https://git.kernel.org/stable/c/93fcab2c6968446316bbb49548848df604d6346f
- https://git.kernel.org/stable/c/d9c115948c3dd5fcc2d0245cec5eb76c098503c8