{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90228", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.794Z", "datePublished": "2026-09-17T16:07:36.625Z", "dateUpdated": "2026-10-19T09:00:04.748Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:00:04.748Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix NULL pointer dereference in nvmet_execute_identify_ns_zns()\n\nWhen a host issues an Identify command with CNS 05h (I/O Command Set\nspecific Identify Namespace) and CSI 02h (ZNS) targeting a file-backed\nnamespace, nvmet_execute_identify_ns_zns() calls bdev_is_zoned() on\nreq->ns->bdev. A file-backed namespace has no block device, so\nreq->ns->bdev is NULL and bdev_is_zoned() dereferences it, oopsing.\n\nThe I/O command set is selected by the host-supplied CSI field and the\ncommand is routed here whenever CONFIG_BLK_DEV_ZONED is enabled,\nindependent of the namespace backing type, so any file-backed namespace\nis exposed.\n\nReject the command with Invalid Field when the namespace is not backed\nby a block device." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The host-controlled Identify capsule (opcode nvme_admin_identify) carries CNS 05h (NVME_ID_CNS_CS_NS) and CSI 02h (NVME_CSI_ZNS); nvmet-tcp receives that CapsuleCmd in nvmet_tcp_done_recv_pdu() after kernel_accept() and dispatches via nvmet_parse_admin_cmd()/nvmet_execute_identify() into nvmet_execute_identify_ns_zns().\nAC:L - The attacker sets identify.cns and identify.csi on Identify for any enabled file-backed NSID; nvmet_execute_identify() routes CSI=ZNS to nvmet_execute_identify_ns_zns() whenever CONFIG_BLK_DEV_ZONED is built in, then bdev_is_zoned(req->ns->bdev) hits NULL with no race or layout dependency.\nPR:N - nvmet_check_ctrl_status() after Connect/CC.EN only enforces DH-HMAC-CHAP when a host_key exists; nvmet_check_auth_status() otherwise returns true, nvmet_host_allowed() treats host NQN as an asserted identifier, and allow_any_host subsystems accept any initiator with no Linux credentials.\nUI:N - The remote initiator itself sends Connect, Property Set of CC.EN, then the crafted Identify; no local user must mount a device, open a file, or otherwise interact.\nS:U - The oops occurs in the target kernel's nvmet-tcp worker while executing nvmet_execute_identify_ns_zns() and stays in that host's kernel authority; it is not a VM escape or IOMMU/sandbox boundary bypass.\nC:N - bdev_is_zoned() only loads bdev->bd_queue through the NULL ns->bdev of a file-backed namespace; nvmet_execute_identify_ns_zns() crashes before nvmet_copy_to_sgl() of the identify buffer, so no kernel data is returned.\nI:N - The fault is a NULL read in bdev_get_queue() via bdev_is_zoned(); no kernel object is overwritten and a pure NULL dereference does not yield a write or control-flow primitive.\nA:H - Calling bdev_is_zoned(req->ns->bdev) with a NULL file-backed bdev in nvmet_execute_identify_ns_zns() oopses the kernel, crashing the NVMe target." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/zns.c" ], "versions": [ { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "1ce8faf90eb0bf5599b90db38500aefea9426485", "status": "affected", "versionType": "git" }, { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "b873099944dae5702b4b6db6814d1f1e8d4cfb00", "status": "affected", "versionType": "git" }, { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "ff28a93a895912010a7827a0e1445ebe8be53b4d", "status": "affected", "versionType": "git" }, { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "cc29f7082b7ab5e0337f27d1fef16359f05fcffa", "status": "affected", "versionType": "git" }, { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "1fb1236312ee1a600de6b3ca560f0b3fd5a50471", "status": "affected", "versionType": "git" }, { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "0b4cf43f9ca7118590a338de900edbd6047cd89f", "status": "affected", "versionType": "git" }, { "version": "aaf2e048af2704da5869f27b508b288f36d5c7b7", "lessThan": "f594863967d87b7fcbff6e724d51135fd701a13d", "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/nvme/target/zns.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "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": "5.14", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1ce8faf90eb0bf5599b90db38500aefea9426485" }, { "url": "https://git.kernel.org/stable/c/b873099944dae5702b4b6db6814d1f1e8d4cfb00" }, { "url": "https://git.kernel.org/stable/c/ff28a93a895912010a7827a0e1445ebe8be53b4d" }, { "url": "https://git.kernel.org/stable/c/cc29f7082b7ab5e0337f27d1fef16359f05fcffa" }, { "url": "https://git.kernel.org/stable/c/1fb1236312ee1a600de6b3ca560f0b3fd5a50471" }, { "url": "https://git.kernel.org/stable/c/0b4cf43f9ca7118590a338de900edbd6047cd89f" }, { "url": "https://git.kernel.org/stable/c/f594863967d87b7fcbff6e724d51135fd701a13d" } ], "title": "nvmet: fix NULL pointer dereference in nvmet_execute_identify_ns_zns()", "x_generator": { "engine": "bippy-1.2.0" } } } }