Integer underflow in Linux kernel - CVE-2026-46043
Published: May 28, 2026
Vulnerability identifier: #VU132451
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-2026-46043
CWE-ID: CWE-191
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 integer underflow in rxe_rcv when processing a crafted RDMA packet with a forged BTH pad field and insufficient length. A remote attacker can send a specially crafted packet to cause a denial of service.
The issue occurs because payload_size() uses the attacker-controlled pad value and ICRC size when calculating the payload length.
How to mitigate CVE-2026-46043
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240
- https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3
- https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa
- https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d
- https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520