fkie_cve-2024-27435
Vulnerability from fkie_nvd
Published
2024-05-17 13:15
Modified
2025-09-26 19:01
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/262da920896e2f2ab0e3947d9dbee0aa09045818Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6851778504cdb49431809b4ba061903d5f592c96Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de105068fead55ed5c07ade75e9c8e7f86a00d1dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff2f90f88d78559802466ad1c84ac5bda4416b3aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/149afee5c7418ec5db9d7387b9c9a5c1eb7ea2a8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/262da920896e2f2ab0e3947d9dbee0aa09045818Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6851778504cdb49431809b4ba061903d5f592c96Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/de105068fead55ed5c07ade75e9c8e7f86a00d1dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff2f90f88d78559802466ad1c84ac5bda4416b3aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.12
linux linux_kernel 5.12
linux linux_kernel 5.12
linux linux_kernel 5.12
linux linux_kernel 5.12
linux linux_kernel 5.12


To clipboard 

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      "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."
    },
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  "id": "CVE-2024-27435",
  "lastModified": "2025-09-26T19:01:59.697",
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