{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68425", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.392Z", "datePublished": "2026-08-10T12:04:45.947Z", "dateUpdated": "2026-08-19T16:35:19.996Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:35:19.996Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mad: Drop unmatched RMPP responses before reassembly\n\nKernel-handled RMPP receive processing starts reassembly for active\nDATA responses before the response is matched to an outstanding send.\nThe normal match happens later, after ib_process_rmpp_recv_wc() has\neither assembled a complete message or consumed the segment.\n\nThat ordering lets an unsolicited response that routes to a kernel\nRMPP agent by the high TID bits allocate or extend RMPP receive state\nbefore the full TID and source address are checked against a real\nrequest. A reordered burst can therefore reach the receive-side\ninsertion path even though the response would not match any send.\n\nFor kernel-handled RMPP DATA responses, require the existing\nib_find_send_mad() match before entering RMPP reassembly. The matcher\nalready checks the full TID, management class and source address/GID\nagainst the agent wait, backlog and in-flight send lists. If there is\nno match, drop the response without creating RMPP state.\n\nThis leaves the RMPP window behavior unchanged and only rejects\nresponses that have no corresponding request." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The attacker must be a node on the same InfiniBand fabric, sending unsolicited GSI (QP1) management datagrams to the victim port; MAD/SA traffic is subnet-local, matching the CVSS \"shared physical or logical network\" definition rather than routable network reach.\nAC:L - No race or unusual precondition is needed: the attacker just sends active RMPP DATA response MADs whose high TID bits name a kernel RMPP agent, and hi_tid is a small cyclic xarray index in [0,2^24) that is trivially enumerated or brute-forced.\nPR:N - The MAD receive path accepts unsolicited datagrams from any fabric peer with no authentication; the only gate is ib_mad_enforce_security() P_Key membership, which the default partition typically grants to every node on the subnet.\nUI:N - Reassembly state is created entirely from attacker-sent packets in the completion handler; no action by a local user or administrator is needed, and the always-registered ib_sa kernel agent is the target.\nS:U - The injected RMPP state, allocations and AH objects all live inside the kernel's own IB MAD layer on the same host, so the impact stays within a single security authority.\nC:N - The flaw creates unmatched reassembly state; it provides no out-of-bounds read, no kernel memory disclosure, and the ACKs the kernel emits echo only attacker-supplied header fields.\nI:L - An unauthenticated fabric peer can insert arbitrary unsolicited entries into the kernel agent's RMPP reassembly lists and make the kernel emit ACKs, and a colliding entry (SA TIDs come from a predictable tid++ counter) diverts and drops a legitimate SA response's segments — limited, bounded modification of kernel protocol state.\nA:H - Each unmatched segment allocates a mad_rmpp_recv, an AH and a retained ~1-2 KB MAD buffer held for 40 seconds with no matching request, so a burst causes unbounded memory/resource exhaustion, while the O(N) rmpp_list walks under an IRQ-disabled spinlock stall MAD processing and break SA/path resolution for the node." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/core/mad.c" ], "versions": [ { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "45416c87ebcece1e90f3bc5bc172d106b77c6b69", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "9634fb1f4d404f36a20ffbcb8797369db69b06bb", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "bfb9e8243fd2099d1080d09222964d988f991d9b", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "dfa535c94406c03d3f0c869ef3ba5528e395737c", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "98d2d468b4faa1fdc68c0c6c238389906ee3490c", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "ad9c9ad3204f63a46f0f7de29687a8e512f05e29", "status": "affected", "versionType": "git" }, { "version": "fa619a77046bef30478697aba0553991033afb8e", "lessThan": "d2e52d610b9b09694261632340b801a421e0b0c5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/core/mad.c" ], "versions": [ { "version": "2.6.13", "status": "affected" }, { "version": "0", "lessThan": "2.6.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/45416c87ebcece1e90f3bc5bc172d106b77c6b69" }, { "url": "https://git.kernel.org/stable/c/9634fb1f4d404f36a20ffbcb8797369db69b06bb" }, { "url": "https://git.kernel.org/stable/c/bfb9e8243fd2099d1080d09222964d988f991d9b" }, { "url": "https://git.kernel.org/stable/c/dfa535c94406c03d3f0c869ef3ba5528e395737c" }, { "url": "https://git.kernel.org/stable/c/6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72" }, { "url": "https://git.kernel.org/stable/c/98d2d468b4faa1fdc68c0c6c238389906ee3490c" }, { "url": "https://git.kernel.org/stable/c/ad9c9ad3204f63a46f0f7de29687a8e512f05e29" }, { "url": "https://git.kernel.org/stable/c/d2e52d610b9b09694261632340b801a421e0b0c5" } ], "title": "IB/mad: Drop unmatched RMPP responses before reassembly", "x_generator": { "engine": "bippy-1.2.0" } } } }