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Vulnerability record · CVE-2026-46043 · published 27 May 2026

CVE-2026-46043: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv rxe_rcv() currently checks only that the incoming packet is at least header_size(pkt) bytes long before payload_size() is used. However, payload_size() subtracts both the attacker-controlled BTH pad field and RXE_ICRC_SIZE from pkt->paylen: payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt) - RXE_ICRC_SIZE This means a short packet can still make payload_size() underflow even if it includes enough bytes for the fixed headers. Simply requiring header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a packet with a forged non-zero BTH pad can still leave payload_size() negative and pass an underflowed value to later receive-path users. Fix this by validating pkt->paylen against the full minimum length required by payload_size(): header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE.

9.1 CVSS 3.1 Critical EPSS 0.51% · top 58.5%
9.1CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv rxe_rcv() currently checks only that the incoming packet is at least header_size(pkt) bytes long before payload_size() is used. However, payload_size() subtracts both the attacker-controlled BTH pad field and RXE_ICRC_SIZE from pkt->paylen: payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt) - RXE_ICRC_SIZE This means a short packet can still make payload_size() underflow even if it includes enough bytes for the fixed headers. Simply requiring header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a packet with a forged non-zero BTH pad can still leave payload_size() negative and pass an underflowed value to later receive-path users. Fix this by validating pkt->paylen against the full minimum length required by payload_size(): header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/2c0d71ef12f46c57d37bc571f3f2797db7eb50cc Patch
https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240 Patch
https://git.kernel.org/stable/c/5fedefec757192dcaad29a664ac332c7601be144 Patch
https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3 Patch
https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa Patch
https://git.kernel.org/stable/c/c4376c672c3648d5bdc31dfffc329d07164f93c4 Patch
https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d Patch
https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46043), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.