251 lines
14 KiB
JSON
251 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-72469",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-09T03:40:39.934Z",
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"datePublished": "2026-08-15T05:57:11.829Z",
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"dateUpdated": "2026-10-21T12:44:59.460Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-21T12:44:59.460Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Fix ep kref imbalance on ADDR_CHANGE\n\nrpcrdma_cm_event_handler() falls through to the disconnected: label\non RDMA_CM_EVENT_ADDR_CHANGE and calls rpcrdma_ep_put() with no\nmatching get when the event arrives before RDMA_CM_EVENT_ESTABLISHED.\nThe kref then underflows during connect teardown and\nrpcrdma_xprt_disconnect() operates on a freed ep.\n\nReference counts across a normal connection lifecycle:\n\n rpcrdma_ep_create() kref_init ->1\n rpcrdma_xprt_connect() ep_get ->2 (before post_recvs)\n RDMA_CM_EVENT_ESTABLISHED ep_get ->3\n RDMA_CM_EVENT_DISCONNECTED ep_put ->2\n rpcrdma_xprt_drain() ep_put ->1\n rpcrdma_xprt_disconnect() tail ep_put ->0 (ep_destroy)\n\nThe connect-time get in rpcrdma_xprt_connect(), taken just before\nrpcrdma_post_recvs() \"while there are outstanding Receives,\" is\nbalanced by rpcrdma_xprt_drain. ADDR_CHANGE before ESTABLISHED has\nno get to consume, so its put drops the count to 1 and the drain\nput then frees the ep while rpcrdma_xprt_disconnect() still holds a\npointer to it.\n\nFix by dispatching on the prior re_connect_status via xchg(): for\nprev == 0 (pre-ESTABLISHED) wake the connect waiter and return with\nno put; for prev == 1 call rpcrdma_force_disconnect() and return.\nThe case-1 arm relies on the subsequent RDMA_CM_EVENT_DISCONNECTED\nevent -- reliably delivered when rdma_disconnect() is called on a\nstill-connected cm_id -- to balance the ESTABLISHED get;\nrpcrdma_xprt_drain() continues to balance only that connect-time\nget. Any other prior value means teardown is already in flight."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:A - The bug is in the NFS/RPC-over-RDMA client reached during RDMA CM connect/reconnect to a remote server; ADDR_CHANGE is delivered on bonded RoCE/IB netdev failover on the storage network segment, a plausible adjacent-network trigger in HPC and cloud NFS-over-RDMA deployments.\nAC:L - Once NFS-over-RDMA is in use, an attacker can reliably drive repeated reconnect attempts and time or induce bonding failover so ADDR_CHANGE arrives pre-ESTABLISHED; the resulting kref underflow and UAF are deterministic, not a probabilistic memory-layout race.\nPR:N - Exploitation requires no privileges on the victim host—only that NFS-over-RDMA is configured and reconnects occur—while an adjacent attacker or malicious storage peer can provoke link failover and connection churn without authenticating to the victim system.\nUI:N - No victim user interaction is required beyond normal automated NFS-over-RDMA client reconnect activity already performed by the kernel when links fail or sessions drop.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security domain, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - Premature free of rpcrdma_ep leaves dangling pointers used in rpcrdma_xprt_disconnect (rdma_disconnect, ib_drain_rq/sq), a classic kernel heap UAF that can be leveraged for arbitrary memory disclosure via controlled reuse of the freed endpoint object.\nI:H - Teardown continues to operate on the freed endpoint and associated RDMA/IB state, enabling heap corruption and potential arbitrary kernel write or control-flow hijack, not merely a benign NULL dereference crash.\nA:H - The kref imbalance causes premature endpoint destruction during disconnect teardown, which can trigger kernel oops/panic from use-after-free even when exploitation for code execution is not attempted."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sunrpc/xprtrdma/verbs.c"
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],
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"versions": [
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{
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"version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec",
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"lessThan": "a562485c359d0b20a99d466b042af9c2f7ff3326",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec",
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"lessThan": "cfd1bab66b042da7a778786685125656c695931b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec",
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"lessThan": "d0479c2b12974aa188b10d221a5770126b118b6d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec",
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"lessThan": "ffc07790539736a5d029f6a3c966b46c529f93a8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec",
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"lessThan": "af9b65b29af341932625c4283dc7a23cdb62688a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2fcbf07a4f23174a45e015b62a8e42ddbc2e53ef",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.7.9",
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"lessThan": "5.8",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sunrpc/xprtrdma/verbs.c"
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],
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"versions": [
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{
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"version": "5.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.8",
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"versionEndExcluding": "6.6.160"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a562485c359d0b20a99d466b042af9c2f7ff3326"
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},
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{
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"url": "https://git.kernel.org/stable/c/cfd1bab66b042da7a778786685125656c695931b"
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},
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{
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"url": "https://git.kernel.org/stable/c/d0479c2b12974aa188b10d221a5770126b118b6d"
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},
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{
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"url": "https://git.kernel.org/stable/c/ffc07790539736a5d029f6a3c966b46c529f93a8"
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},
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{
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"url": "https://git.kernel.org/stable/c/af9b65b29af341932625c4283dc7a23cdb62688a"
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}
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],
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"title": "xprtrdma: Fix ep kref imbalance on ADDR_CHANGE",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-72469",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:50:27.416569Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T18:55:25.440Z"
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}
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}
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]
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}
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} |