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vuln-cve/data/2026/99xxx/CVE-2026-99166.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-99166",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.398Z",
"datePublished": "2026-10-28T10:35:18.050Z",
"dateUpdated": "2026-10-30T12:42:32.571Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:42:32.571Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rds: fix uninitialized trans dereference in CM event handler\n\nrds_rdma_cm_event_handler_cmn() assigns trans only when the RDMA\ndevice is an InfiniBand CA (RDMA_NODE_IB_CA). On any other device\ntype, e.g. an iWARP RNIC such as siw, trans stays uninitialized, but\nthe event switch dereferences it: unconditionally in the\nRDMA_CM_EVENT_CONNECT_REQUEST case via trans->cm_handle_connect(),\nand (with a connection context) in the ROUTE_RESOLVED and\nESTABLISHED cases.\n\nAn RDS listener on an iWARP device therefore crashes the kernel as\nsoon as a connect request arrives: with CONFIG_INIT_STACK_ALL_ZERO\nthe wild load becomes a NULL dereference at offset 0xa0\n(&trans->cm_handle_connect) in the iw_cm_wq workqueue.\n\nGCC masks the bug in default builds by folding the uninitialized\nload into &rds_ib_transport; Clang-built kernels take the real\nuninitialized path and oops.\n\nThe active side can land on a non-IB device too: the id that\nrds_ib_conn_path_connect() creates is not restricted to a node type,\nso rdma_resolve_addr() binds it to whichever device serves the local\naddress, and an iWARP RNIC on the same netdev qualifies. The crash\nthere is different: resolving a route on an iWARP id never fills in\ncm_id->route.path_rec, and the ROUTE_RESOLVED case writes\npath_rec[0].sl before it calls into the transport.\n\nThe iWARP transport was dropped long ago and IB is the only\ntransport left, so make that explicit: initialize trans to\n&rds_ib_transport at declaration, drop the conditional assignment,\nreject a connect request that arrives on a non-IB device, and drop a\nconnection whose address resolved to one instead of resolving a\nroute on it. The rejection is limited to RDMA_CM_EVENT_CONNECT_REQUEST\non purpose: a non-zero return from the handler makes rdma_cm destroy\nthe id the event was delivered on, which is right for the request's\nfreshly created id but would free a connection id that RDS still owns\nfor any other event. On the active side the id stays ic->i_cm_id and\nthe connection's shutdown destroys it, so that case returns 0.\n\n[achender: reject only on RDMA_CM_EVENT_CONNECT_REQUEST instead of\n bailing out for every event on a non-IB device, so that rdma_cm does\n not destroy connection ids RDS still tracks; drop a connection whose\n address resolved to a non-IB device before a route is resolved on it;\n changelog adjusted]"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/rds/rdma_transport.c"
],
"versions": [
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "0d15e853aa88da5375edd32b39d08a048b64a1c5",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "8c77774535c3d6162929521a6fa11e3db086fa32",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "8973f70cb068012d83cff1cfa3f45ef94ab02267",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "a2fde862b98db8908e2ebaffbb35a75a0e9d5b33",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "074bb7cdc3e26afa698888ba56fc1df0e3f24650",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "5f23e4e3a31dacfd82a8f56be253adc0910ee84f",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "ca14c289ed9ffed6cc64290d039e923e5720a8bf",
"status": "affected",
"versionType": "git"
},
{
"version": "dcdede0406d30e14a6ed727dce69dfac0518371d",
"lessThan": "492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/rds/rdma_transport.c"
],
"versions": [
{
"version": "4.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.6",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.161",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.115",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.59",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.13",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"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": "4.6",
"versionEndExcluding": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.6.161"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.12.115"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.18.59"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "7.2.13"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/0d15e853aa88da5375edd32b39d08a048b64a1c5"
},
{
"url": "https://git.kernel.org/stable/c/8c77774535c3d6162929521a6fa11e3db086fa32"
},
{
"url": "https://git.kernel.org/stable/c/8973f70cb068012d83cff1cfa3f45ef94ab02267"
},
{
"url": "https://git.kernel.org/stable/c/a2fde862b98db8908e2ebaffbb35a75a0e9d5b33"
},
{
"url": "https://git.kernel.org/stable/c/074bb7cdc3e26afa698888ba56fc1df0e3f24650"
},
{
"url": "https://git.kernel.org/stable/c/5f23e4e3a31dacfd82a8f56be253adc0910ee84f"
},
{
"url": "https://git.kernel.org/stable/c/ca14c289ed9ffed6cc64290d039e923e5720a8bf"
},
{
"url": "https://git.kernel.org/stable/c/492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8"
}
],
"title": "net: rds: fix uninitialized trans dereference in CM event handler",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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