{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89972", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.778Z", "datePublished": "2026-09-16T10:32:51.701Z", "dateUpdated": "2026-10-21T12:49:17.240Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:49:17.240Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme: add missing SRCU grace period in error path\n\nnvme_alloc_ns() error path at out_unlink_ns removes ns from the\nnamespace head siblings list with list_del_rcu(&ns->siblings) but\ndoes not wait for SRCU readers before freeing the namespace struct.\nMultipath code iterates the head->list under srcu_read_lock() in\nnvme_find_path() and nvme_mpath_revalidate_paths(), so a concurrent\nreader can still hold a reference to ns when kfree(ns) runs.\n\nThe normal removal path in nvme_ns_remove() correctly calls\nsynchronize_srcu(&ns->head->srcu) after list_del_rcu() to wait for\nin-progress readers. Add the same grace period in the error path." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - NVMe host core scans namespaces from NVMe-oF (nvme-tcp/rdma/fc) when a remote target sends NS_CHANGED AENs or Identify data; a malicious or compromised fabric target drives nvme_scan_ns→nvme_alloc_ns and the out_unlink_ns UAF over the network (typically TCP 4420).\nAC:L - The remote target controls both sides of the race: it can stall then fail Identify after list_add_tail_rcu so the new path is on head->list, while concurrent multipath I/O or ANA AENs walk that list under srcu_read_lock in nvme_find_path/nvme_mpath_revalidate_paths; CONFIG_NVME_MULTIPATH is the recommended default.\nPR:N - The attacker is the NVMe-oF peer and needs no host account or capability; NVMe/TCP is unauthenticated by default (TLS and DH-HMAC-CHAP are optional), and AENs plus Identify responses are accepted on an already-established fabrics session.\nUI:N - NVMe-oF controllers are persistent boot/autoconnect configuration; namespace rescans, ANA updates, and multipath I/O run from kernel workqueues and the block layer with no further victim action at exploit time.\nS:U - The use-after-free corrupts kernel heap (struct nvme_ns) inside the host NVMe driver and does not cross a VM, IOMMU, or other distinct security authority.\nC:H - Use-after-free of the namespace object on the multipath siblings list lets an attacker reclaim the kmalloc slab and obtain a kernel read primitive from stale ns->disk/ctrl/flags dereferences in nvme_find_path.\nI:H - The same UAF is heap-sprayable: multipath I/O and ioctl paths dereference fields of the freed nvme_ns, enabling arbitrary write and control-flow hijacking in kernel context.\nA:H - Any use-after-free of ns during the SRCU list walk can oops or panic the host kernel even without a full exploit, taking down the NVMe storage stack." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/host/core.c" ], "versions": [ { "version": "ed754e5deeb17f4e675c84e4b6c640cc7344e498", "lessThan": "3868476cd39161f18720582df17a1b621e805b5d", "status": "affected", "versionType": "git" }, { "version": "ed754e5deeb17f4e675c84e4b6c640cc7344e498", "lessThan": "0d4735418512ef825176726eaaa8bd6a35f6b46d", "status": "affected", "versionType": "git" }, { "version": "ed754e5deeb17f4e675c84e4b6c640cc7344e498", "lessThan": "d663944dbad81bb0e3635d7090db4713e6300858", "status": "affected", "versionType": "git" }, { "version": "ed754e5deeb17f4e675c84e4b6c640cc7344e498", "lessThan": "76023560d60f10b4f808941163aa2975f1631683", "status": "affected", "versionType": "git" }, { "version": "ed754e5deeb17f4e675c84e4b6c640cc7344e498", "lessThan": "ef248d5de4469fb6bbaf8dbe0c4c47800080d648", "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/host/core.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "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": "4.15", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3868476cd39161f18720582df17a1b621e805b5d" }, { "url": "https://git.kernel.org/stable/c/0d4735418512ef825176726eaaa8bd6a35f6b46d" }, { "url": "https://git.kernel.org/stable/c/d663944dbad81bb0e3635d7090db4713e6300858" }, { "url": "https://git.kernel.org/stable/c/76023560d60f10b4f808941163aa2975f1631683" }, { "url": "https://git.kernel.org/stable/c/ef248d5de4469fb6bbaf8dbe0c4c47800080d648" } ], "title": "nvme: add missing SRCU grace period in error path", "x_generator": { "engine": "bippy-1.2.0" } } } }