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CVE-2026-68425

IB/mad: Drop unmatched RMPP responses before reassembly

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: IB/mad: Drop unmatched RMPP responses before reassembly Kernel-handled RMPP receive processing starts reassembly for active DATA responses before the response is matched to an outstanding send. The normal match happens later, after ib_process_rmpp_recv_wc() has either assembled a complete message or consumed the segment. That ordering lets an unsolicited response that routes to a kernel RMPP agent by the high TID bits allocate or extend RMPP receive state before the full TID and source address are checked against a real request. A reordered burst can therefore reach the receive-side insertion path even though the response would not match any send. For kernel-handled RMPP DATA responses, require the existing ib_find_send_mad() match before entering RMPP reassembly. The matcher already checks the full TID, management class and source address/GID against the agent wait, backlog and in-flight send lists. If there is no match, drop the response without creating RMPP state. This leaves the RMPP window behavior unchanged and only rejects responses that have no corresponding request.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From fa619a77046bef30478697aba0553991033afb8e · fixed in 45416c87ebcece1e90f3bc5bc172d106b77c6b69; From fa619a77046bef30478697aba0553991033afb8e · fixed in 9634fb1f4d404f36a20ffbcb8797369db69b06bb; From fa619a77046bef30478697aba0553991033afb8e · fixed in bfb9e8243fd2099d1080d09222964d988f991d9b; From fa619a77046bef30478697aba0553991033afb8e · fixed in dfa535c94406c03d3f0c869ef3ba5528e395737c; From fa619a77046bef30478697aba0553991033afb8e · fixed in 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72; From fa619a77046bef30478697aba0553991033afb8e · fixed in 98d2d468b4faa1fdc68c0c6c238389906ee3490c; From fa619a77046bef30478697aba0553991033afb8e · fixed in ad9c9ad3204f63a46f0f7de29687a8e512f05e29; From fa619a77046bef30478697aba0553991033afb8e · fixed in d2e52d610b9b09694261632340b801a421e0b0c5

  • Linux Linux

    2.6.13

  • KernelLinux

    From 2.6.13 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org