{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27435", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:47:42.687Z", "datePublished": "2024-05-17T12:12:36.439Z", "dateUpdated": "2026-08-05T11:29:48.601Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:48.601Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme: fix reconnection fail due to reserved tag allocation\n\nWe found a issue on production environment while using NVMe over RDMA,\nadmin_q reconnect failed forever while remote target and network is ok.\nAfter dig into it, we found it may caused by a ABBA deadlock due to tag\nallocation. In my case, the tag was hold by a keep alive request\nwaiting inside admin_q, as we quiesced admin_q while reset ctrl, so the\nrequest maked as idle and will not process before reset success. As\nfabric_q shares tagset with admin_q, while reconnect remote target, we\nneed a tag for connect command, but the only one reserved tag was held\nby keep alive command which waiting inside admin_q. As a result, we\nfailed to reconnect admin_q forever. In order to fix this issue, I\nthink we should keep two reserved tags for admin queue." } ], "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 affected code is the NVMe-over-Fabrics host driver (nvme-tcp/nvme-rdma/nvme-fc), and the controller reset that opens the race window is triggered directly from remote peer input — `nvme_tcp_state_change()` fires error recovery on a peer FIN/RST, and the receive path calls `nvme_tcp_error_recovery()` on any malformed PDU. A remote or on-path attacker against the NVMe/TCP connection (port 4420) can drive the vulnerable path without local access.\nAC:L - The attacker controls the reset side of the race and can force error recovery/reconnect cycles arbitrarily many times (reconnect re-arms the keep-alive timer each round), while the keep-alive period is deterministic at kato/2, so the window can be hit by retry and by timing; the bug was also observed occurring spontaneously in production. Once won, the leaked reserved tag is permanent — no further conditions are needed.\nPR:N - No credentials on the victim host are required — the triggering events (TCP FIN/RST, malformed NVMe/TCP PDU, unresponsive target) are handled by `nvme_tcp_state_change()` and the recv path before or independent of any NVMe-level authentication, and NVMe/TCP deployments commonly run with no DH-HMAC-CHAP or TLS at all.\nUI:N - Exploitation requires no action from any user or administrator; an already-established NVMe-oF connection is a system configuration precondition, not victim interaction, and the keep-alive/reset machinery runs autonomously in kernel workqueues.\nS:U - The impact is confined to the kernel and the host's own storage stack — no security authority boundary such as a VM, IOMMU, or sandbox is crossed.\nC:N - The defect is a reserved-tag leak causing an ABBA allocation deadlock; no memory is read out of bounds, no freed object is accessed, and no kernel data is disclosed to the attacker.\nI:N - There is no memory corruption, out-of-bounds write, or control-flow primitive — the only consequence is that a blk-mq tag is never returned, so no attacker-influenced data modification is possible.\nA:H - The admin queue can never reconnect (\"failed to reconnect admin_q forever\"), because the admin tagset is not reallocated on reconnect and the connect command's reserved tag allocation fails with -EAGAIN indefinitely, producing a permanent loss of the NVMe-oF storage path plus eventual controller deletion (and a hung, unkillable teardown worker blocked on queue freeze) — total availability loss for storage that is frequently the system's root or primary data volume." } ] } ], "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", "drivers/nvme/host/fabrics.h" ], "versions": [ { "version": "ed01fee283a067c72b2d6500046080dbc1bb9dae", "lessThan": "149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8", "status": "affected", "versionType": "git" }, { "version": "ed01fee283a067c72b2d6500046080dbc1bb9dae", "lessThan": "ff2f90f88d78559802466ad1c84ac5bda4416b3a", "status": "affected", "versionType": "git" }, { "version": "ed01fee283a067c72b2d6500046080dbc1bb9dae", "lessThan": "6851778504cdb49431809b4ba061903d5f592c96", "status": "affected", "versionType": "git" }, { "version": "ed01fee283a067c72b2d6500046080dbc1bb9dae", "lessThan": "262da920896e2f2ab0e3947d9dbee0aa09045818", "status": "affected", "versionType": "git" }, { "version": "ed01fee283a067c72b2d6500046080dbc1bb9dae", "lessThan": "de105068fead55ed5c07ade75e9c8e7f86a00d1d", "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", "drivers/nvme/host/fabrics.h" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.83", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "5.12", "versionEndExcluding": "6.1.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.7.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8" }, { "url": "https://git.kernel.org/stable/c/ff2f90f88d78559802466ad1c84ac5bda4416b3a" }, { "url": "https://git.kernel.org/stable/c/6851778504cdb49431809b4ba061903d5f592c96" }, { "url": "https://git.kernel.org/stable/c/262da920896e2f2ab0e3947d9dbee0aa09045818" }, { "url": "https://git.kernel.org/stable/c/de105068fead55ed5c07ade75e9c8e7f86a00d1d" } ], "title": "nvme: fix reconnection fail due to reserved tag allocation", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-05-31T18:39:12.435774Z", "id": "CVE-2024-27435", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA 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