{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89506", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.716Z", "datePublished": "2026-09-11T19:43:53.350Z", "dateUpdated": "2026-09-11T19:43:53.350Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:43:53.350Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR\n\nThe original commit missed that three drivers (mthca, irdma, siw) have UHW\ndata associated with reg_mr that cannot be passed through the ioctl. They\nalso assume that the udata cannot be NULL, so failing to pass a valid\nudata can trigger a NULL udata crash in those drivers.\n\nThis never happens in real systems since in rdma-core ibv_cmd_reg_mr_ex()\ndoes not accept a udata and those three drivers don't use it, however a\nmalicious userspace could trigger it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/core/uverbs_std_types_mr.c"], "versions": [{"version": "5b2e45049dc06a876bc6b138218ddeb0814502ef", "lessThan": "71d5c41ac583df09a7c32199bef7d42de7267d07", "status": "affected", "versionType": "git"}, {"version": "5b2e45049dc06a876bc6b138218ddeb0814502ef", "lessThan": "9e71d0f4944ba5641e01db29b3256c963656d671", "status": "affected", "versionType": "git"}, {"version": "5b2e45049dc06a876bc6b138218ddeb0814502ef", "lessThan": "011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/core/uverbs_std_types_mr.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.17", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/71d5c41ac583df09a7c32199bef7d42de7267d07"}, {"url": "https://git.kernel.org/stable/c/9e71d0f4944ba5641e01db29b3256c963656d671"}, {"url": "https://git.kernel.org/stable/c/011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf"}], "title": "RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/core/uverbs_std_types_mr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "71d5c41ac583df09a7c32199bef7d42de7267d07", "status": "affected", "version": "5b2e45049dc06a876bc6b138218ddeb0814502ef", "versionType": "git"}, {"lessThan": "9e71d0f4944ba5641e01db29b3256c963656d671", "status": "affected", "version": "5b2e45049dc06a876bc6b138218ddeb0814502ef", "versionType": "git"}, {"lessThan": "011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf", "status": "affected", "version": "5b2e45049dc06a876bc6b138218ddeb0814502ef", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/core/uverbs_std_types_mr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nRDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR\n\nThe original commit missed that three drivers (mthca, irdma, siw) have UHW\ndata associated with reg_mr that cannot be passed through the ioctl. They\nalso assume that the udata cannot be NULL, so failing to pass a valid\nudata can trigger a NULL udata crash in those drivers.\n\nThis never happens in real systems since in rdma-core ibv_cmd_reg_mr_ex()\ndoes not accept a udata and those three drivers don't use it, however a\nmalicious userspace could trigger it."}], "id": "CVE-2026-89506", "lastModified": "2026-09-11T20:19:32.917", "metrics": {}, "published": "2026-09-11T20:19:32.917", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/71d5c41ac583df09a7c32199bef7d42de7267d07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e71d0f4944ba5641e01db29b3256c963656d671"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: RDMA/uverbs null pointer dereference leads to Denial of Service", "id": "2532195", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532195"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's RDMA/uverbs component. A missing update to the UVERBS_METHOD_REG_MR ioctl allows a malicious userspace program to trigger a null pointer dereference in specific RDMA drivers (mthca, irdma, siw). This can lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-89506", "public_date": "2026-09-11T19:43:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89506\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89506\nhttps://git.kernel.org/stable/c/011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf\nhttps://git.kernel.org/stable/c/71d5c41ac583df09a7c32199bef7d42de7267d07\nhttps://git.kernel.org/stable/c/9e71d0f4944ba5641e01db29b3256c963656d671"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5b2e45049dc06a876bc6b138218ddeb0814502ef,71d5c41ac583df09a7c32199bef7d42de7267d07)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5b2e45049dc06a876bc6b138218ddeb0814502ef,9e71d0f4944ba5641e01db29b3256c963656d671)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5b2e45049dc06a876bc6b138218ddeb0814502ef,011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf)"}}], "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": "[6.17,6.17]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"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": "2026-09-12T03:45:07.951463+00:00", "title": "Null pointer dereference in RDMA drivers causes kernel crash", "updated": "2026-09-12T20:15:17.606734+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}