{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89970", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.778Z", "datePublished": "2026-09-16T10:32:50.306Z", "dateUpdated": "2026-10-19T08:55:43.826Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:55:43.826Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: Synchronize timeout work during SQ teardown\n\nnvmet_auth_sq_free() cancels auth_expired_work with\ncancel_delayed_work(). If the work has already started, cancellation does\nnot wait for the callback. Transport teardown can consequently free or\nreuse the queue containing struct nvmet_sq while\nnvmet_auth_expired_work() still accesses that SQ.\n\nAdd a teardown-specific helper that synchronously drains the delayed work\nbefore freeing authentication state, and use it from nvmet_sq_destroy().\nKeep the non-synchronous helper for in-band authentication state cleanup,\nwhere the SQ owner remains alive." } ], "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 - The UAF is in nvmet-auth timeout work reached via AUTH_SEND on NVMe-oF targets; nvmet-tcp (and nvmet-rdma) accept remote connections, so a network initiator can arm the timer and tear down the queue over TCP/RDMA.\nAC:L - The attacker controls both sides of the race: AUTH_SEND schedules auth_expired_work with an attacker-chosen KATO delay, and closing the connection runs nvmet_sq_destroy(); cancel_delayed_work() does not wait, so the race is repeatable.\nPR:N - AUTH_SEND is dispatched as a Fabrics command before nvmet_check_auth_status() and before DH-HMAC-CHAP credentials are verified; discovery accepts any host NQN, so no Linux privileges or verified secrets are required.\nUI:N - No victim user action is required; the attacker connects to an already-deployed NVMe-oF target, sends AUTH_SEND to arm the timeout, and disconnects when the work is due.\nS:U - The use-after-free corrupts the in-kernel nvmet_sq/queue object on the target host and does not cross a VM, hypervisor, or IOMMU security boundary.\nC:H - Transport teardown can free or reuse the queue containing struct nvmet_sq while nvmet_auth_expired_work() still accesses it; that UAF can be leveraged for kernel information disclosure via heap reuse.\nI:H - The delayed work writes dhchap_step and dhchap_tid into a potentially freed or reused queue object, giving a kernel UAF write primitive exploitable for memory corruption and control-flow hijacking.\nA:H - Racing the timeout callback against SQ teardown is a kernel UAF of the queue and can oops or panic; the work may also dereference sq->ctrl after teardown has already cleared it." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/auth.c", "drivers/nvme/target/core.c", "drivers/nvme/target/nvmet.h" ], "versions": [ { "version": "1a70200f404ae210b4f0334e3936e84f8edb6bc8", "lessThan": "664022fa1c93f4eba09ef5ee02411b9709dd7a93", "status": "affected", "versionType": "git" }, { "version": "1a70200f404ae210b4f0334e3936e84f8edb6bc8", "lessThan": "c3c126a6142a1335bc8c34a5607c39cf01daf295", "status": "affected", "versionType": "git" }, { "version": "1a70200f404ae210b4f0334e3936e84f8edb6bc8", "lessThan": "c17c87bde6d6f5252a6a6f0a94b2430164aa28d5", "status": "affected", "versionType": "git" }, { "version": "1a70200f404ae210b4f0334e3936e84f8edb6bc8", "lessThan": "7555ddd60af72df2862dd8f9b730a9848577edda", "status": "affected", "versionType": "git" }, { "version": "1a70200f404ae210b4f0334e3936e84f8edb6bc8", "lessThan": "eb4f9127a2b8a152743f1ee597627e2f69cb54fe", "status": "affected", "versionType": "git" }, { "version": "1a70200f404ae210b4f0334e3936e84f8edb6bc8", "lessThan": "eaa948c0e19b1bb2d93262207bca0c3d19cc3406", "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/auth.c", "drivers/nvme/target/core.c", "drivers/nvme/target/nvmet.h" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "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": "6.18.51", "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": "6.0", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/664022fa1c93f4eba09ef5ee02411b9709dd7a93" }, { "url": "https://git.kernel.org/stable/c/c3c126a6142a1335bc8c34a5607c39cf01daf295" }, { "url": "https://git.kernel.org/stable/c/c17c87bde6d6f5252a6a6f0a94b2430164aa28d5" }, { "url": "https://git.kernel.org/stable/c/7555ddd60af72df2862dd8f9b730a9848577edda" }, { "url": "https://git.kernel.org/stable/c/eb4f9127a2b8a152743f1ee597627e2f69cb54fe" }, { "url": "https://git.kernel.org/stable/c/eaa948c0e19b1bb2d93262207bca0c3d19cc3406" } ], "title": "nvmet-auth: Synchronize timeout work during SQ teardown", "x_generator": { "engine": "bippy-1.2.0" } } } }