CVE-2026-89535

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/xprtrdma/svc_rdma_transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fcd4a752ac840d39356f4d2a424d3aca4e39716b", "status": "affected", "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "versionType": "git"}, {"lessThan": "9f2f5d0999364c7070306cd422d8babc2621070d", "status": "affected", "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "versionType": "git"}, {"lessThan": "cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9", "status": "affected", "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "versionType": "git"}, {"lessThan": "4488e912973773d64368828acf3b8e39d93650ae", "status": "affected", "version": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/xprtrdma/svc_rdma_transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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)."}], "id": "CVE-2026-89535", "lastModified": "2026-10-19T09:17:48.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:36.500", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4488e912973773d64368828acf3b8e39d93650ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f2f5d0999364c7070306cd422d8babc2621070d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fcd4a752ac840d39356f4d2a424d3aca4e39716b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Use-after-free in svcrdma module", "id": "2532438", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532438"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the svcrdma module of the Linux kernel. A use-after-free vulnerability can occur due to an incorrect order of operations during the teardown of an RDMA (Remote Direct Memory Access) transport. If a device unregistration process happens concurrently, it can attempt to access a memory region that has already been freed, potentially leading to system instability or denial of service."], "name": "CVE-2026-89535", "public_date": "2026-09-11T19:44:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89535\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89535\nhttps://git.kernel.org/stable/c/4488e912973773d64368828acf3b8e39d93650ae\nhttps://git.kernel.org/stable/c/9f2f5d0999364c7070306cd422d8babc2621070d\nhttps://git.kernel.org/stable/c/cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4de97f7c45434985e5dbf2d6ccc9eca676e37fe,9f2f5d0999364c7070306cd422d8babc2621070d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4de97f7c45434985e5dbf2d6ccc9eca676e37fe,cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4de97f7c45434985e5dbf2d6ccc9eca676e37fe,4488e912973773d64368828acf3b8e39d93650ae)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T09:45:11.610349+00:00", "updated": "2026-09-15T22:45:07.198742+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}