CVE-2026-89534

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89534", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.720Z", "datePublished": "2026-09-11T19:44:12.987Z", "dateUpdated": "2026-10-30T12:32:03.526Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:03.526Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails\n\nWhen svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE,\nit creates a replacement listener cm_id and returns 1, telling\nthe CM core to destroy the old one. If the replacement allocation\nfails, sc_cm_id still points at the old cm_id that the CM core is\nabout to destroy. Any subsequent dereference of sc_cm_id --\nsuch as svc_rdma_detach()'s rdma_disconnect() call -- is a\nuse-after-free.\n\nNULL sc_cm_id on the failure path and guard svc_rdma_detach()'s\nrdma_disconnect() call against NULL so that the listener can\nbe torn down safely when the server shuts down."}], "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 - svcrdma is the in-kernel NFS/RDMA server listen path; RDMA_CM_EVENT_ADDR_CHANGE is raised only from cma_netdev_callback on NETDEV_BONDING_FAILOVER when the bound bond MAC changes, so an attacker on the RoCE/IB storage fabric inducing active-backup failover reaches the bug, matching ADDR_CHANGE scoring for RPC-over-RDMA.\nAC:L - svc_rdma_create_listen_id() binds the replacement while the old listen cm_id still owns the port, so rdma_bind_addr() fails deterministically with EADDRINUSE/EADDRNOTAVAIL; the handler still returns 1 and the CM core frees that id, leaving a dangling sc_cm_id the attacker can arm by inducing failover.\nPR:N - The NFS/RDMA listener is already running as a network service; bonding failover and RDMA CM ADDR_CHANGE delivery perform no RPC, NFS export, or other authentication, so an adjacent fabric attacker needs no account or capability on the victim host.\nUI:N - Exploitation uses attacker-induced link failover plus subsequent listener teardown (nfsd restart/shutdown, the normal operational response once the listen endpoint is dead); no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - The use-after-free corrupts the host kernel rdma_cm_id/rdma_id_private object used by nfsd's RDMA transport in the same kernel security authority and is not a VM, IOMMU, or sandbox escape.\nC:H - After the CM core destroys the listen id, sc_cm_id is a dangling pointer to a freed rdma_cm_id with an event_handler; later rdma_disconnect()/rdma_destroy_id() in svc_rdma_detach/free is a kernel heap UAF that enables arbitrary disclosure via controlled reuse.\nI:H - svc_rdma_detach() calls rdma_disconnect() on the freed cm_id and svc_rdma_free() may rdma_destroy_id() it again, yielding UAF writes, double-free, and function-pointer hijack of event_handler, so integrity impact is High per UAF guidance.\nA:H - Use-after-free of the listen rdma_cm_id during detach/free causes a kernel oops or panic even when not fully exploited, so availability impact is High."}]}], "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": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "lessThan": "2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8", "status": "affected", "versionType": "git"}, {"version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "lessThan": "65f0f82f20334e76acaf29087a59af7b3b9699ed", "status": "affected", "versionType": "git"}, {"version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "lessThan": "673e358ab7c11f8cec223c6a36a793056a67facd", "status": "affected", "versionType": "git"}, {"version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "lessThan": "01500306e1d50de7ca7a2cdcdfa28ac0523eb747", "status": "affected", "versionType": "git"}, {"version": "2f84d6e8b0a7093758d8da19cec111140e7b6d41", "status": "affected", "versionType": "git"}, {"version": "5cd069ad1cf7fb46af31f0dbe2850868335f5272", "status": "affected", "versionType": "git"}, {"version": "6.1.191", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.6.160", "lessThan": "6.7", "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/svc_rdma_transport.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "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": "6.11", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.160"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8"}, {"url": "https://git.kernel.org/stable/c/65f0f82f20334e76acaf29087a59af7b3b9699ed"}, {"url": "https://git.kernel.org/stable/c/673e358ab7c11f8cec223c6a36a793056a67facd"}, {"url": "https://git.kernel.org/stable/c/01500306e1d50de7ca7a2cdcdfa28ac0523eb747"}], "title": "svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails", "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": "2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8", "status": "affected", "version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "versionType": "git"}, {"lessThan": "65f0f82f20334e76acaf29087a59af7b3b9699ed", "status": "affected", "version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "versionType": "git"}, {"lessThan": "673e358ab7c11f8cec223c6a36a793056a67facd", "status": "affected", "version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "versionType": "git"}, {"lessThan": "01500306e1d50de7ca7a2cdcdfa28ac0523eb747", "status": "affected", "version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2", "versionType": "git"}, {"status": "affected", "version": "2f84d6e8b0a7093758d8da19cec111140e7b6d41", "versionType": "git"}, {"status": "affected", "version": "5cd069ad1cf7fb46af31f0dbe2850868335f5272", "versionType": "git"}, {"lessThan": "6.2", "status": "affected", "version": "6.1.191", "versionType": "semver"}, {"lessThan": "6.7", "status": "affected", "version": "6.6.160", "versionType": "semver"}]}, {"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": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "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: Clear sc_cm_id when ADDR_CHANGE replacement fails\n\nWhen svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE,\nit creates a replacement listener cm_id and returns 1, telling\nthe CM core to destroy the old one. If the replacement allocation\nfails, sc_cm_id still points at the old cm_id that the CM core is\nabout to destroy. Any subsequent dereference of sc_cm_id --\nsuch as svc_rdma_detach()'s rdma_disconnect() call -- is a\nuse-after-free.\n\nNULL sc_cm_id on the failure path and guard svc_rdma_detach()'s\nrdma_disconnect() call against NULL so that the listener can\nbe torn down safely when the server shuts down."}], "id": "CVE-2026-89534", "lastModified": "2026-10-30T13:20:19.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:36.390", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/01500306e1d50de7ca7a2cdcdfa28ac0523eb747"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65f0f82f20334e76acaf29087a59af7b3b9699ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/673e358ab7c11f8cec223c6a36a793056a67facd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Use-after-free vulnerability in svcrdma module", "id": "2532026", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532026"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's `svcrdma` module. This vulnerability occurs when the system attempts to handle an RDMA (Remote Direct Memory Access) address change, and a critical memory allocation fails. This can lead to a 'use-after-free' error, where the system tries to access memory that has already been released. A local attacker could potentially exploit this to cause a system crash, leading to a denial of service, or in some scenarios, execute unauthorized code."], "name": "CVE-2026-89534", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:44:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89534\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89534\nhttps://git.kernel.org/stable/c/01500306e1d50de7ca7a2cdcdfa28ac0523eb747\nhttps://git.kernel.org/stable/c/673e358ab7c11f8cec223c6a36a793056a67facd"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1b586e75ec619dde1af47e21a41a6b1b51874c2,673e358ab7c11f8cec223c6a36a793056a67facd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1b586e75ec619dde1af47e21a41a6b1b51874c2,01500306e1d50de7ca7a2cdcdfa28ac0523eb747)"}}], "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": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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": "2026-09-12T07:15:10.615216+00:00", "updated": "2026-09-15T22:45:07.199277+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}