GHSA-C5CH-44Q8-865H

Vulnerability from github – Published: 2026-01-14 15:33 – Updated: 2026-01-14 15:33
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

block: Remove queue freezing from several sysfs store callbacks

Freezing the request queue from inside sysfs store callbacks may cause a deadlock in combination with the dm-multipath driver and the queue_if_no_path option. Additionally, freezing the request queue slows down system boot on systems where sysfs attributes are set synchronously.

Fix this by removing the blk_mq_freeze_queue() / blk_mq_unfreeze_queue() calls from the store callbacks that do not strictly need these callbacks. Add the __data_racy annotation to request_queue.rq_timeout to suppress KCSAN data race reports about the rq_timeout reads.

This patch may cause a small delay in applying the new settings.

For all the attributes affected by this patch, I/O will complete correctly whether the old or the new value of the attribute is used.

This patch affects the following sysfs attributes: * io_poll_delay * io_timeout * nomerges * read_ahead_kb * rq_affinity

Here is an example of a deadlock triggered by running test srp/002 if this patch is not applied:

task:multipathd Call Trace: __schedule+0x8c1/0x1bf0 schedule+0xdd/0x270 schedule_preempt_disabled+0x1c/0x30 __mutex_lock+0xb89/0x1650 mutex_lock_nested+0x1f/0x30 dm_table_set_restrictions+0x823/0xdf0 __bind+0x166/0x590 dm_swap_table+0x2a7/0x490 do_resume+0x1b1/0x610 dev_suspend+0x55/0x1a0 ctl_ioctl+0x3a5/0x7e0 dm_ctl_ioctl+0x12/0x20 __x64_sys_ioctl+0x127/0x1a0 x64_sys_call+0xe2b/0x17d0 do_syscall_64+0x96/0x3a0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 task:(udev-worker) Call Trace: __schedule+0x8c1/0x1bf0 schedule+0xdd/0x270 blk_mq_freeze_queue_wait+0xf2/0x140 blk_mq_freeze_queue_nomemsave+0x23/0x30 queue_ra_store+0x14e/0x290 queue_attr_store+0x23e/0x2c0 sysfs_kf_write+0xde/0x140 kernfs_fop_write_iter+0x3b2/0x630 vfs_write+0x4fd/0x1390 ksys_write+0xfd/0x230 __x64_sys_write+0x76/0xc0 x64_sys_call+0x276/0x17d0 do_syscall_64+0x96/0x3a0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

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{
  "affected": [],
  "aliases": [
    "CVE-2025-71117"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-14T15:16:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Remove queue freezing from several sysfs store callbacks\n\nFreezing the request queue from inside sysfs store callbacks may cause a\ndeadlock in combination with the dm-multipath driver and the\nqueue_if_no_path option. Additionally, freezing the request queue slows\ndown system boot on systems where sysfs attributes are set synchronously.\n\nFix this by removing the blk_mq_freeze_queue() / blk_mq_unfreeze_queue()\ncalls from the store callbacks that do not strictly need these callbacks.\nAdd the __data_racy annotation to request_queue.rq_timeout to suppress\nKCSAN data race reports about the rq_timeout reads.\n\nThis patch may cause a small delay in applying the new settings.\n\nFor all the attributes affected by this patch, I/O will complete\ncorrectly whether the old or the new value of the attribute is used.\n\nThis patch affects the following sysfs attributes:\n* io_poll_delay\n* io_timeout\n* nomerges\n* read_ahead_kb\n* rq_affinity\n\nHere is an example of a deadlock triggered by running test srp/002\nif this patch is not applied:\n\ntask:multipathd\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x8c1/0x1bf0\n schedule+0xdd/0x270\n schedule_preempt_disabled+0x1c/0x30\n __mutex_lock+0xb89/0x1650\n mutex_lock_nested+0x1f/0x30\n dm_table_set_restrictions+0x823/0xdf0\n __bind+0x166/0x590\n dm_swap_table+0x2a7/0x490\n do_resume+0x1b1/0x610\n dev_suspend+0x55/0x1a0\n ctl_ioctl+0x3a5/0x7e0\n dm_ctl_ioctl+0x12/0x20\n __x64_sys_ioctl+0x127/0x1a0\n x64_sys_call+0xe2b/0x17d0\n do_syscall_64+0x96/0x3a0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \u003c/TASK\u003e\ntask:(udev-worker)\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x8c1/0x1bf0\n schedule+0xdd/0x270\n blk_mq_freeze_queue_wait+0xf2/0x140\n blk_mq_freeze_queue_nomemsave+0x23/0x30\n queue_ra_store+0x14e/0x290\n queue_attr_store+0x23e/0x2c0\n sysfs_kf_write+0xde/0x140\n kernfs_fop_write_iter+0x3b2/0x630\n vfs_write+0x4fd/0x1390\n ksys_write+0xfd/0x230\n __x64_sys_write+0x76/0xc0\n x64_sys_call+0x276/0x17d0\n do_syscall_64+0x96/0x3a0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \u003c/TASK\u003e",
  "id": "GHSA-c5ch-44q8-865h",
  "modified": "2026-01-14T15:33:01Z",
  "published": "2026-01-14T15:33:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71117"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3997b3147c7b68b0308378fa95a766015f8ceb1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/935a20d1bebf6236076785fac3ff81e3931834e9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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