Bug 2482127 (CVE-2026-46043) - CVE-2026-46043 kernel: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
Summary: CVE-2026-46043 kernel: RDMA/rxe: Validate pad and ICRC before payload_size() ...
Keywords:
Status: NEW
Alias: CVE-2026-46043
Product: Security Response
Classification: Other
Component: vulnerability-draft
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-27 15:12 UTC by OSIDB Bzimport
Modified: 2026-10-29 14:16 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:68570 0 None None None 2026-09-17 12:15:48 UTC
Red Hat Product Errata RHSA-2026:70402 0 None None None 2026-09-22 20:21:04 UTC
Red Hat Product Errata RHSA-2026:70403 0 None None None 2026-09-22 19:30:14 UTC
Red Hat Product Errata RHSA-2026:77216 0 None None None 2026-10-07 02:49:13 UTC
Red Hat Product Errata RHSA-2026:77217 0 None None None 2026-10-07 03:39:01 UTC
Red Hat Product Errata RHSA-2026:77218 0 None None None 2026-10-07 06:27:30 UTC
Red Hat Product Errata RHSA-2026:77219 0 None None None 2026-10-08 07:23:20 UTC
Red Hat Product Errata RHSA-2026:77301 0 None None None 2026-10-07 07:05:03 UTC

Description OSIDB Bzimport 2026-05-27 15:12:36 UTC 
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.
Comment 1 Keith Grant 2026-05-27 19:33:28 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052751-CVE-2026-46043-153e@gregkh/T
Comment 4 Jon Orris 2026-09-17 12:15:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:68570 https://access.redhat.com/errata/RHSA-2026:68570
Comment 5 Jon Orris 2026-09-22 19:30:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:70403 https://access.redhat.com/errata/RHSA-2026:70403
Comment 6 Jon Orris 2026-09-22 20:21:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:70402 https://access.redhat.com/errata/RHSA-2026:70402
Comment 8 Jon Orris 2026-10-07 02:49:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:77216 https://access.redhat.com/errata/RHSA-2026:77216
Comment 9 Jon Orris 2026-10-07 03:39:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:77217 https://access.redhat.com/errata/RHSA-2026:77217
Comment 10 Jon Orris 2026-10-07 06:27:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:77218 https://access.redhat.com/errata/RHSA-2026:77218
Comment 11 Jon Orris 2026-10-07 07:05:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:77301 https://access.redhat.com/errata/RHSA-2026:77301
Comment 12 Jon Orris 2026-10-08 07:23:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:77219 https://access.redhat.com/errata/RHSA-2026:77219
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