{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72469", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.934Z", "datePublished": "2026-08-15T05:57:11.829Z", "dateUpdated": "2026-08-17T05:44:33.996Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:33.996Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/xprtrdma/verbs.c" ], "versions": [ { "version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec", "lessThan": "cfd1bab66b042da7a778786685125656c695931b", "status": "affected", "versionType": "git" }, { "version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec", "lessThan": "d0479c2b12974aa188b10d221a5770126b118b6d", "status": "affected", "versionType": "git" }, { "version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec", "lessThan": "ffc07790539736a5d029f6a3c966b46c529f93a8", "status": "affected", "versionType": "git" }, { "version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec", "lessThan": "af9b65b29af341932625c4283dc7a23cdb62688a", "status": "affected", "versionType": "git" }, { "version": "2fcbf07a4f23174a45e015b62a8e42ddbc2e53ef", "status": "affected", "versionType": "git" }, { "version": "5.7.9", "lessThan": "5.8", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/xprtrdma/verbs.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "5.8", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cfd1bab66b042da7a778786685125656c695931b" }, { "url": "https://git.kernel.org/stable/c/d0479c2b12974aa188b10d221a5770126b118b6d" }, { "url": "https://git.kernel.org/stable/c/ffc07790539736a5d029f6a3c966b46c529f93a8" }, { "url": "https://git.kernel.org/stable/c/af9b65b29af341932625c4283dc7a23cdb62688a" } ], "title": "xprtrdma: Fix ep kref imbalance on ADDR_CHANGE", "x_generator": { "engine": "bippy-1.2.0" } } } }