Linux Kernel RMPP Unmatched Response Drop (CVE-2026-68425)
CVE-2026-68425 Published on August 10, 2026
IB/mad: Drop unmatched RMPP responses before reassembly
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.
Products Associated with CVE-2026-68425
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Affected Versions
Linux:- Version fa619a77046bef30478697aba0553991033afb8e and below dfa535c94406c03d3f0c869ef3ba5528e395737c is affected.
- Version fa619a77046bef30478697aba0553991033afb8e and below 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72 is affected.
- Version fa619a77046bef30478697aba0553991033afb8e and below 98d2d468b4faa1fdc68c0c6c238389906ee3490c is affected.
- Version fa619a77046bef30478697aba0553991033afb8e and below ad9c9ad3204f63a46f0f7de29687a8e512f05e29 is affected.
- Version fa619a77046bef30478697aba0553991033afb8e and below d2e52d610b9b09694261632340b801a421e0b0c5 is affected.
- Version 2.6.13 is affected.
- Before 2.6.13 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.