IB/mad: Drop unmatched RMPP responses before reassembly

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Summary

CVECVE-2026-68425
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:36 UTC
Updated2026-08-19 17:20:49 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002550000 probability, percentile 0.172310000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e 45416c87ebcece1e90f3bc5bc172d106b77c6b69 git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e 9634fb1f4d404f36a20ffbcb8797369db69b06bb git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e bfb9e8243fd2099d1080d09222964d988f991d9b git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e dfa535c94406c03d3f0c869ef3ba5528e395737c git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72 git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e 98d2d468b4faa1fdc68c0c6c238389906ee3490c git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e ad9c9ad3204f63a46f0f7de29687a8e512f05e29 git Not specified
CNA Linux Linux affected fa619a77046bef30478697aba0553991033afb8e d2e52d610b9b09694261632340b801a421e0b0c5 git Not specified
CNA Linux Linux affected 2.6.13 Not specified
CNA Linux Linux unaffected 2.6.13 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dfa535c94406c03d3f0c869ef3ba5528e395737c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2e52d610b9b09694261632340b801a421e0b0c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bfb9e8243fd2099d1080d09222964d988f991d9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9634fb1f4d404f36a20ffbcb8797369db69b06bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad9c9ad3204f63a46f0f7de29687a8e512f05e29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/98d2d468b4faa1fdc68c0c6c238389906ee3490c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45416c87ebcece1e90f3bc5bc172d106b77c6b69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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