{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-35808",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-35808"
  ],
  "published": "2024-05-17T13:23:58Z",
  "summary": "md/dm-raid: don't call md_reap_sync_thread() directly",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/dm-raid: don't call md_reap_sync_thread() directly\n\nCurrently md_reap_sync_thread() is called from raid_message() directly\nwithout holding 'reconfig_mutex', this is definitely unsafe because\nmd_reap_sync_thread() can change many fields that is protected by\n'reconfig_mutex'.\n\nHowever, hold 'reconfig_mutex' here is still problematic because this\nwill cause deadlock, for example, commit 130443d60b1b (\"md: refactor\nidle/frozen_sync_thread() to fix deadlock\").\n\nFix this problem by using stop_sync_thread() to unregister sync_thread,\nlike md/raid did.",
  "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-2024-35808"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/347dcdc15a1706f61aa545ae498ededdf31aeebc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e59b8d76ff511505eb0dd1478329f09e0f04669"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cd32b27a66db8776d8b8e82ec7d7dde97a8693b0"
    }
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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 vulnerable `raid_message()` handler is reached only through the local `DM_TARGET_MSG` ioctl on /dev/mapper/control (`ctl_ioctl` \u2192 `target_message` \u2192 `ti->type->message`). No remote or adjacent network path exists.\nAC:L - The attacker controls both sides of the race \u2014 it can start a sync/reshape with a `check`/`repair`/`resync` message and then issue concurrent `idle`/`frozen` messages from multiple threads, so two contexts enter `md_reap_sync_thread()` simultaneously; dm-raid is a standard distro module, so no rare configuration is needed.\nPR:L - The device-mapper control ioctl is gated by CAP_SYS_ADMIN, but this is delegated capability rather than exclusive host root in practice \u2014 privileged containers, storage-management daemons and LVM helper services hold it \u2014 and kernel-CNA scoring consistently treats dm-ioctl-reachable defects as low-privilege local attacks.\nUI:N - The attacker performs every step itself (create/activate the dm-raid target, start the sync thread, issue the racing messages); no action by another user or administrator is required.\nS:U - The corruption is confined to kernel memory and on-disk RAID metadata managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unlocked reap yields a use-after-free/double-free of `struct md_thread` plus an unsynchronized walk of the `mddev->disks` rdev list, and reclaiming the freed slab object gives an attacker-controlled read primitive over kernel memory.\nI:H - The double `kfree()`/UAF is a classic heap-corruption primitive exploitable for arbitrary write and control-flow hijack, and additionally `md_update_sb()` and `pers->finish_reshape()` run concurrently with the md thread, writing inconsistent RAID superblocks and mutating array geometry mid-reshape.\nA:H - Double-free/UAF of the sync thread reliably produces slab corruption, oops, and kernel panic, and the unsynchronized recovery-flag manipulation can wedge the sync-thread state machine into the deadlock/hang class the commit series explicitly addresses."
    }
  }
}