Out-of-bounds read in Linux kernel - CVE-2026-53151
Published: June 26, 2026
Vulnerability identifier: #VU135635
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-53151
CWE-ID: CWE-125
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.
The vulnerability exists due to an out-of-bounds read in rxrpc_input_soft_acks() when parsing the SACK table from a fragmented UDP packet. A remote attacker can send a deliberately fragmented packet to cause a denial of service.
The issue affects AF_RXRPC extended ACK parsing, and exploitation likely requires a deliberately pre-generated fragmented packet.
How to mitigate CVE-2026-53151
Install security update from vendor's repository.