CVE-2023-53531 (GCVE-0-2023-53531)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:46 – Updated: 2026-05-11 19:46
VLAI?
Title
null_blk: fix poll request timeout handling
Summary
In the Linux kernel, the following vulnerability has been resolved: null_blk: fix poll request timeout handling When doing io_uring benchmark on /dev/nullb0, it's easy to crash the kernel if poll requests timeout triggered, as reported by David. [1] BUG: kernel NULL pointer dereference, address: 0000000000000008 Workqueue: kblockd blk_mq_timeout_work RIP: 0010:null_timeout_rq+0x4e/0x91 Call Trace: ? null_timeout_rq+0x4e/0x91 blk_mq_handle_expired+0x31/0x4b bt_iter+0x68/0x84 ? bt_tags_iter+0x81/0x81 __sbitmap_for_each_set.constprop.0+0xb0/0xf2 ? __blk_mq_complete_request_remote+0xf/0xf bt_for_each+0x46/0x64 ? __blk_mq_complete_request_remote+0xf/0xf ? percpu_ref_get_many+0xc/0x2a blk_mq_queue_tag_busy_iter+0x14d/0x18e blk_mq_timeout_work+0x95/0x127 process_one_work+0x185/0x263 worker_thread+0x1b5/0x227 This is indeed a race problem between null_timeout_rq() and null_poll(). null_poll() null_timeout_rq() spin_lock(&nq->poll_lock) list_splice_init(&nq->poll_list, &list) spin_unlock(&nq->poll_lock) while (!list_empty(&list)) req = list_first_entry() list_del_init() ... blk_mq_add_to_batch() // req->rq_next = NULL spin_lock(&nq->poll_lock) // rq->queuelist->next == NULL list_del_init(&rq->queuelist) spin_unlock(&nq->poll_lock) Fix these problems by setting requests state to MQ_RQ_COMPLETE under nq->poll_lock protection, in which null_timeout_rq() can safely detect this race and early return. Note this patch just fix the kernel panic when request timeout happen. [1] https://lore.kernel.org/all/3893581.1691785261@warthog.procyon.org.uk/
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0a593fbbc245a85940ed34caa3aa1e4cb060c54b , < a0b4a0666beacfe8add9c71d8922475541dbae73 (git)
Affected: 0a593fbbc245a85940ed34caa3aa1e4cb060c54b , < a7cb2e709f2927cc3c76781df3e45de2381b3b9d (git)
Affected: 0a593fbbc245a85940ed34caa3aa1e4cb060c54b , < 5a26e45edb4690d58406178b5a9ea4c6dcf2c105 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.54 , ≤ 6.1.* (semver)
Unaffected: 6.5.4 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "drivers/block/null_blk/main.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: fix poll request timeout handling\n\nWhen doing io_uring benchmark on /dev/nullb0, it\u0027s easy to crash the\nkernel if poll requests timeout triggered, as reported by David. [1]\n\nBUG: kernel NULL pointer dereference, address: 0000000000000008\nWorkqueue: kblockd blk_mq_timeout_work\nRIP: 0010:null_timeout_rq+0x4e/0x91\nCall Trace:\n ? null_timeout_rq+0x4e/0x91\n blk_mq_handle_expired+0x31/0x4b\n bt_iter+0x68/0x84\n ? bt_tags_iter+0x81/0x81\n __sbitmap_for_each_set.constprop.0+0xb0/0xf2\n ? __blk_mq_complete_request_remote+0xf/0xf\n bt_for_each+0x46/0x64\n ? __blk_mq_complete_request_remote+0xf/0xf\n ? percpu_ref_get_many+0xc/0x2a\n blk_mq_queue_tag_busy_iter+0x14d/0x18e\n blk_mq_timeout_work+0x95/0x127\n process_one_work+0x185/0x263\n worker_thread+0x1b5/0x227\n\nThis is indeed a race problem between null_timeout_rq() and null_poll().\n\nnull_poll()\t\t\t\tnull_timeout_rq()\n  spin_lock(\u0026nq-\u003epoll_lock)\n  list_splice_init(\u0026nq-\u003epoll_list, \u0026list)\n  spin_unlock(\u0026nq-\u003epoll_lock)\n\n  while (!list_empty(\u0026list))\n    req = list_first_entry()\n    list_del_init()\n    ...\n    blk_mq_add_to_batch()\n    // req-\u003erq_next = NULL\n\t\t\t\t\tspin_lock(\u0026nq-\u003epoll_lock)\n\n\t\t\t\t\t// rq-\u003equeuelist-\u003enext == NULL\n\t\t\t\t\tlist_del_init(\u0026rq-\u003equeuelist)\n\n\t\t\t\t\tspin_unlock(\u0026nq-\u003epoll_lock)\n\nFix these problems by setting requests state to MQ_RQ_COMPLETE under\nnq-\u003epoll_lock protection, in which null_timeout_rq() can safely detect\nthis race and early return.\n\nNote this patch just fix the kernel panic when request timeout happen.\n\n[1] https://lore.kernel.org/all/3893581.1691785261@warthog.procyon.org.uk/"
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          "url": "https://git.kernel.org/stable/c/5a26e45edb4690d58406178b5a9ea4c6dcf2c105"
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    "dateReserved": "2025-10-01T11:39:39.408Z",
    "dateUpdated": "2026-05-11T19:46:46.673Z",
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  }
}


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  • 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.
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  • 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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