CVE-2024-27435 (GCVE-0-2024-27435)
Vulnerability from cvelistv5 – Published: 2024-05-17 12:12 – Updated: 2026-08-05 11:29
VLAI
EPSS
VEX
Title
nvme: fix reconnection fail due to reserved tag allocation
Summary
In the Linux kernel, the following vulnerability has been resolved:
nvme: fix reconnection fail due to reserved tag allocation
We found a issue on production environment while using NVMe over RDMA,
admin_q reconnect failed forever while remote target and network is ok.
After dig into it, we found it may caused by a ABBA deadlock due to tag
allocation. In my case, the tag was hold by a keep alive request
waiting inside admin_q, as we quiesced admin_q while reset ctrl, so the
request maked as idle and will not process before reset success. As
fabric_q shares tagset with admin_q, while reconnect remote target, we
need a tag for connect command, but the only one reserved tag was held
by keep alive command which waiting inside admin_q. As a result, we
failed to reconnect admin_q forever. In order to fix this issue, I
think we should keep two reserved tags for admin queue.
Severity
7.5 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-31 18:39 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ed01fee283a067c72b2d6500046080dbc1bb9dae , < 149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8
(git)
Affected: ed01fee283a067c72b2d6500046080dbc1bb9dae , < ff2f90f88d78559802466ad1c84ac5bda4416b3a (git) Affected: ed01fee283a067c72b2d6500046080dbc1bb9dae , < 6851778504cdb49431809b4ba061903d5f592c96 (git) Affected: ed01fee283a067c72b2d6500046080dbc1bb9dae , < 262da920896e2f2ab0e3947d9dbee0aa09045818 (git) Affected: ed01fee283a067c72b2d6500046080dbc1bb9dae , < de105068fead55ed5c07ade75e9c8e7f86a00d1d (git) |
guessed | |
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (semver) Unaffected: 6.1.83 , ≤ 6.1.* (semver) Unaffected: 6.6.23 , ≤ 6.6.* (semver) Unaffected: 6.7.11 , ≤ 6.7.* (semver) Unaffected: 6.8.2 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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En mi caso, la etiqueta estaba retenida por una solicitud de mantenimiento en espera dentro de admin_q, ya que desactivamos admin_q mientras reiniciamos Ctrl, por lo que la solicitud se realiz\u00f3 como inactiva y no se procesar\u00e1 antes de que el reinicio se realice correctamente. Como fabric_q comparte el conjunto de etiquetas con admin_q, mientras reconectamos el objetivo remoto, necesitamos una etiqueta para el comando de conexi\u00f3n, pero la \u00fanica etiqueta reservada estaba mantenida por el comando Keep Alive que esperaba dentro de admin_q. Como resultado, no pudimos volver a conectar admin_q para siempre. Para solucionar este problema, creo que deber\u00edamos mantener dos etiquetas reservadas para la cola de 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:07:31+00:00",
"cve": "CVE-2024-27435",
"id": "CVE-2024-27435",
"initial_release_date": "2024-05-17T00:00:00+00:00",
"product_status:fixed": "279",
"product_status:known_affected": "98",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: nvme: fix reconnection fail due to reserved tag allocation",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-27435.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-30T02:40:41Z",
"cve": "CVE-2024-27435",
"id": "CVE-2024-27435",
"initial_release_date": "2024-05-21T02:00:32Z",
"product_status:known_affected": "435",
"product_status:known_not_affected": "142",
"product_status:recommended": "699",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-27435",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-27435.json",
"version": "110"
},
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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 \\u2014 no further conditions are needed.\\nPR:N - No credentials on the victim host are required \\u2014 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\u0027s own storage stack \\u2014 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 \\u2014 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\u0027s 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) \\u2014 total availability loss for storage that is frequently the system\u0027s root or primary data volume.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ed01fee283a067c72b2d6500046080dbc1bb9dae\", \"lessThan\": \"149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ed01fee283a067c72b2d6500046080dbc1bb9dae\", \"lessThan\": \"ff2f90f88d78559802466ad1c84ac5bda4416b3a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ed01fee283a067c72b2d6500046080dbc1bb9dae\", \"lessThan\": \"6851778504cdb49431809b4ba061903d5f592c96\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ed01fee283a067c72b2d6500046080dbc1bb9dae\", \"lessThan\": \"262da920896e2f2ab0e3947d9dbee0aa09045818\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ed01fee283a067c72b2d6500046080dbc1bb9dae\", \"lessThan\": \"de105068fead55ed5c07ade75e9c8e7f86a00d1d\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/nvme/host/core.c\", \"drivers/nvme/host/fabrics.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/nvme/host/core.c\", \"drivers/nvme/host/fabrics.h\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.83\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.23\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.11\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.2\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:48.601Z\"}}}",
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"dataType": "CVE_RECORD",
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}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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