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CVE-2026-46043

RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in c4376c672c3648d5bdc31dfffc329d07164f93c4; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 5fedefec757192dcaad29a664ac332c7601be144; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 2c0d71ef12f46c57d37bc571f3f2797db7eb50cc; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 2fd4f8b749309a61c3f3f88ee8891d94f79e1240; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in f83519a4c122c9c7a850a2197648a9ff4c67c520; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 9b924f3a26b21330a837cfe72e819b6393bbeeaa; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in e8ee0e792d475b1067c199ef0af1b6221fa6f43d; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 7244491dab347f648e661da96dc0febadd9daec3

  • Linux Linux

    4.8

  • KernelLinux

    From 4.8.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.140; From 6.7.0 · fixed in 6.12.86; From 6.13.0 · fixed in 6.18.27; From 6.19.0 · fixed in 7.0.4

References 8

git.kernel.org