{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-38583",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-38583"
  ],
  "published": "2024-06-19T13:37:58Z",
  "summary": "nilfs2: fix use-after-free of timer for log writer thread",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix use-after-free of timer for log writer thread\n\nPatch series \"nilfs2: fix log writer related issues\".\n\nThis bug fix series covers three nilfs2 log writer-related issues,\nincluding a timer use-after-free issue and potential deadlock issue on\nunmount, and a potential freeze issue in event synchronization found\nduring their analysis.  Details are described in each commit log.\n\n\nThis patch (of 3):\n\nA use-after-free issue has been reported regarding the timer sc_timer on\nthe nilfs_sc_info structure.\n\nThe problem is that even though it is used to wake up a sleeping log\nwriter thread, sc_timer is not shut down until the nilfs_sc_info structure\nis about to be freed, and is used regardless of the thread's lifetime.\n\nFix this issue by limiting the use of sc_timer only while the log writer\nthread is alive.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-38583"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/822ae5a8eac30478578a75f7e064f0584931bf2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/82933c84f188dcfe89eb26b0b48ab5d1ca99d164"
    },
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      "url": "https://git.kernel.org/stable/c/67fa90d4a2ccd9ebb0e1e168c7d0b5d0cf3c7148"
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    {
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      "url": "https://git.kernel.org/stable/c/e65ccf3a4de4f0c763d94789615b83e11f204438"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86a30d6302deddb9fb97ba6fc4b04d0e870b582a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f9186bba4ea282b07293c1c892441df3a5441cb0"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f12b2c03c5dae1a0de0a9e5853177e3d6eee3c6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/68e738be5c518fc3c4e9146b66f67c8fee0135fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f5d4e04634c9cf68bdf23de08ada0bb92e8befe7"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug lives in the nilfs2 log-writer (segctord) lifecycle and is triggered through local filesystem activity plus teardown of the mount (nilfs_put_super \u2192 nilfs_detach_log_writer); there is no remote or network-facing path to fs/nilfs2/segment.c.\nAC:L - The attacker controls both sides of the race \u2014 ordinary file writes arm sc_timer via nilfs_transaction_commit() \u2192 nilfs_segctor_start_timer() (expires = jiffies + sc_interval, 5s default), and the log-writer thread's exit is driven by the unmount, while the window can be widened arbitrarily by leaving lots of dirty data so nilfs_segctor_write_out() spends seconds in disk I/O (and nilfs_segctor_notify() even re-arms the timer after the thread is dead).\nPR:L - The dangling-timer condition is created by ordinary unprivileged file writes on the mounted nilfs2 volume, and in realistic deployments (desktops/kiosks with udisks2 or autofs managing removable nilfs2 media, appliances where mount lifecycle is user-driven) an unprivileged local user also controls when the volume is unmounted, so no root capability is inherently needed beyond basic access to the mount.\nUI:N - No victim action is needed \u2014 the attacker's own file writes and the mount teardown (automounter expiry, media eject, or routine unmount) suffice; nothing must be opened or accepted by another user.\nS:U - The corruption occurs in kernel memory (a freed task_struct) within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - nilfs_construction_timeout() dereferences sci->sc_timer_task, which is never cleared when nilfs_segctor_thread() exits, so wake_up_process() operates on a freed kthread task_struct; this use-after-free lets an attacker who reclaims that memory read and infer kernel state, and per kernel scoring practice a UAF is treated as High confidentiality impact.\nI:H - try_to_wake_up() writes into the freed task_struct (p->__state, p->on_rq, scheduler entity fields) and dereferences p->sched_class function pointers, giving a write primitive and potential control-flow hijack if the slab memory is reallocated with attacker-sprayed content.\nA:H - Even without successful heap grooming, the stale timer firing on freed memory corrupts scheduler state and reliably produces a KASAN splat, oops, or kernel panic, and the fault occurs during unmount so the system is left in an inconsistent state."
    }
  }
}