Out-of-bounds read in Linux kernel - CVE-2026-46133
Published: May 29, 2026
Vulnerability identifier: #VU133068
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-2026-46133
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 rxe_icrc_hdr() and opcode handling in the Soft RoCE receive path when processing a specially crafted UDP packet with an unknown RDMA opcode. A remote attacker can send a specially crafted UDP packet to trigger an out-of-bounds read and cause a denial of service.
The issue can be triggered without authentication after the RDMA RXE interface is enabled, and no queue pair or connection setup is required.
How to mitigate CVE-2026-46133
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/006a3a5f75345c6a0dbf13fd3ee01406e93b6733
- https://git.kernel.org/stable/c/4c6f86d85d03cdb33addce86aa69aa795ca6c47a
- https://git.kernel.org/stable/c/6fa18025e5782afff91415fd5217b39c1e4837d7
- https://git.kernel.org/stable/c/e3dc3a2fb05f4ed49c7f20594c4c52350d032189
- https://git.kernel.org/stable/c/f8ee926431a7bbec2b10c1290664af2cb290b983