Out-of-bounds write in Linux kernel - CVE-2026-31616
Published: April 25, 2026
Vulnerability identifier: #VU127788
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31616
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in pn_rx_complete() when processing an unbounded sequence of full-page USB OUT transfers. A remote attacker can send a crafted sequence of full-page USB OUT transfers to cause memory corruption.
The issue affects a Linux gadget exposing a Phonet function and occurs when each transfer is exactly PAGE_SIZE bytes, preventing the skb from being reset.
How to mitigate CVE-2026-31616
Install security update from vendor's repository.