SB20260626195 - Out-of-bounds read in Linux kernel rxrpc
Published: June 26, 2026
Security Bulletin ID
SB20260626195
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-53151)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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
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.
Remediation
Install update from vendor's website.