Stack-based buffer overflow in Linux kernel - CVE-2026-31630
Published: April 25, 2026
Vulnerability identifier: #VU127764
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31630
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a stack-based buffer overflow in the AF_RXRPC procfs helpers when formatting socket addresses for procfs output with "%pISpc". A local user can trigger address formatting with a specially crafted IPv6 address representation to cause a denial of service.
The issue occurs because the fixed 50-byte stack buffers are too small for the longest current IPv6-with-port textual form, including certain ISATAP address formats.
How to mitigate CVE-2026-31630
Install security update from vendor's repository.