Heap-based buffer overflow in Linux kernel - CVE-2026-31607
Published: April 25, 2026
Vulnerability identifier: #VU127796
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-2026-31607
CWE-ID: CWE-122
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 a denial of service or execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in usbip_pack_ret_submit() when processing a RET_SUBMIT response from a USB/IP server. A remote attacker can send a specially crafted response with an oversized number_of_packets value to cause a denial of service or execute arbitrary code.
The issue occurs because the response value is later used as the loop bound for accesses to urb->iso_frame_desc[], whose allocation size was determined by the original submission.
How to mitigate CVE-2026-31607
Install security update from vendor's repository.