{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89535", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.720Z", "datePublished": "2026-09-11T19:44:13.733Z", "dateUpdated": "2026-10-19T08:48:26.908Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:26.908Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id\n\nsvc_rdma_free() caches rdma->sc_cm_id->device before teardown,\nthen calls rdma_destroy_id(sc_cm_id) which frees the cm_id.\nrpcrdma_rn_unregister() follows, but between those two calls\nthe transport's sc_rn entry is still installed in the device's\nrd_xa. A concurrent ib_unregister_device walk can dispatch\nsvc_rdma_xprt_done() against the now-freed sc_cm_id.\n\nMove rpcrdma_rn_unregister() before rdma_destroy_id() so the\ntransport's notification entry is removed from the xarray before\nthe cm_id it references is destroyed.\n\nAlso guard the sc_cm_id dereference with a NULL check: the\nfollowing patches introduce paths that reach svc_rdma_free()\nwith sc_cm_id == NULL (listener create failure, ADDR_CHANGE\nreplacement failure)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - svcrdma is nfsd's RPC-over-RDMA server transport; a remote peer over routable RoCEv2 or iWARP reaches svc_rdma_free() by disconnecting an accepted connection or by forcing the post-rpcrdma_rn_register accept-error path after CONNECT_REQUEST.\nAC:H - The UAF exists only between rdma_destroy_id() and rpcrdma_rn_unregister(); triggering it requires a concurrent ib_unregister_device xarray walk (unbind, VF hot-unplug, or rxe/siw link delete) that a remote peer cannot initiate or reliably time.\nPR:N - RDMA CM CONNECT_REQUEST, accept, and DISCONNECT run before RPC or NFS authentication, and the CM handshake has no credential check, so an unauthenticated peer can drive the teardown path.\nUI:N - Opening and dropping RPC-over-RDMA connections against an already-listening NFS/RDMA service is sufficient; concurrent administrative device removal is attack complexity, not victim user interaction.\nS:U - The use-after-free of the rdma_cm_id and any double-put of the svcxprt_rdma remain in the host kernel; this is not a VM, IOMMU, or sandbox escape.\nC:H - A concurrent rpcrdma_remove_one() walk calls svc_rdma_xprt_done(), which reads the already-freed sc_cm_id (device name and route address); a reclaimable slab UAF is confidentiality High per kernel UAF guidance.\nI:H - On the accept-failure path the same callback can svc_xprt_close() a transport whose kref is already zero, calling rdma_disconnect() on the freed cm_id and dropping the kref again, yielding a double-free/UAF write primitive.\nA:H - Dereferencing the freed rdma_cm_id or double-freeing the svcxprt_rdma causes a kernel oops or panic; any use-after-free is availability High per kernel CVSS guidance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/xprtrdma/svc_rdma_transport.c" ], "versions": [ { "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "lessThan": "fcd4a752ac840d39356f4d2a424d3aca4e39716b", "status": "affected", "versionType": "git" }, { "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "lessThan": "9f2f5d0999364c7070306cd422d8babc2621070d", "status": "affected", "versionType": "git" }, { "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "lessThan": "cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9", "status": "affected", "versionType": "git" }, { "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "lessThan": "4488e912973773d64368828acf3b8e39d93650ae", "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/sunrpc/xprtrdma/svc_rdma_transport.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "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": "6.12", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fcd4a752ac840d39356f4d2a424d3aca4e39716b" }, { "url": "https://git.kernel.org/stable/c/9f2f5d0999364c7070306cd422d8babc2621070d" }, { "url": "https://git.kernel.org/stable/c/cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9" }, { "url": "https://git.kernel.org/stable/c/4488e912973773d64368828acf3b8e39d93650ae" } ], "title": "svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id", "x_generator": { "engine": "bippy-1.2.0" } } } }