{
  "cveId": "CVE-2024-26658",
  "url": "https://patchblox.com/security/cve/CVE-2024-26658",
  "summary": "CVE-2024-26658 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26658, released April 2, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  bcachefs: grab s_umount only if snapshotting  Wh...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bcachefs: grab s_umount only if snapshotting  When I was testing mongodb over bcachefs with compression, there is a lockdep warning when snapshotting mongodb data volume.  $ cat test.sh prog=bcachefs  $prog subvolume create /mnt/data $prog subvolume create /mnt/data/snapshots  while true;do     $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date \u002B%s)     sleep 1s done  $ cat /etc/mongodb.conf systemLog:   destination: file   logAppend: true   path: /mnt/data/mongod.log  storage:   dbPath: /mnt/data/  lockdep reports: [ 3437.452330] ====================================================== [ 3437.452750] WARNING: possible circular locking dependency detected [ 3437.453168] 6.7.0-rc7-custom\u002B #85 Tainted: G            E [ 3437.453562] ------------------------------------------------------ [ 3437.453981] bcachefs/35533 is trying to acquire lock: [ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.\u002B.\u002B}-{0:0}, at: filename_create\u002B0x62/0x190 [ 3437.454875]                but task is already holding lock: [ 3437.455268] ffffa0a02b2b10e0 (\u0026type-\u003Es_umount_key#48){.\u002B.\u002B}-{3:3}, at: bch2_fs_file_ioctl\u002B0x232/0xc90 [bcachefs] [ 3437.456009]                which lock already depends on the new lock.  [ 3437.456553]                the existing dependency chain (in reverse order) is: [ 3437.457054]                -\u003E #3 (\u0026type-\u003Es_umount_key#48){.\u002B.\u002B}-{3:3}: [ 3437.457507]        down_read\u002B0x3e/0x170 [ 3437.457772]        bch2_fs_file_ioctl\u002B0x232/0xc90 [bcachefs] [ 3437.458206]        __x64_sys_ioctl\u002B0x93/0xd0 [ 3437.458498]        do_syscall_64\u002B0x42/0xf0 [ 3437.458779]        entry_SYSCALL_64_after_hwframe\u002B0x6e/0x76 [ 3437.459155]                -\u003E #2 (\u0026c-\u003Esnapshot_create_lock){\u002B\u002B\u002B\u002B}-{3:3}: [ 3437.459615]        down_read\u002B0x3e/0x170 [ 3437.459878]        bch2_truncate\u002B0x82/0x110 [bcachefs] [ 3437.460276]        bchfs_truncate\u002B0x254/0x3c0 [bcachefs] [ 3437.460686]        notify_change\u002B0x1f1/0x4a0 [ 3437.461283]        do_truncate\u002B0x7f/0xd0 [ 3437.461555]        path_openat\u002B0xa57/0xce0 [ 3437.461836]        do_filp_open\u002B0xb4/0x160 [ 3437.462116]        do_sys_openat2\u002B0x91/0xc0 [ 3437.462402]        __x64_sys_openat\u002B0x53/0xa0 [ 3437.462701]        do_syscall_64\u002B0x42/0xf0 [ 3437.462982]        entry_SYSCALL_64_after_hwframe\u002B0x6e/0x76 [ 3437.463359]                -\u003E #1 (\u0026sb-\u003Es_type-\u003Ei_mutex_key#15){\u002B.\u002B.}-{3:3}: [ 3437.463843]        down_write\u002B0x3b/0xc0 [ 3437.464223]        bch2_write_iter\u002B0x5b/0xcc0 [bcachefs] [ 3437.464493]        vfs_write\u002B0x21b/0x4c0 [ 3437.464653]        ksys_write\u002B0x69/0xf0 [ 3437.464839]        do_syscall_64\u002B0x42/0xf0 [ 3437.465009]        entry_SYSCALL_64_after_hwframe\u002B0x6e/0x76 [ 3437.465231]                -\u003E #0 (sb_writers#10){.\u002B.\u002B}-{0:0}: [ 3437.465471]        __lock_acquire\u002B0x1455/0x21b0 [ 3437.465656]        lock_acquire\u002B0xc6/0x2b0 [ 3437.465822]        mnt_want_write\u002B0x46/0x1a0 [ 3437.465996]        filename_create\u002B0x62/0x190 [ 3437.466175]        user_path_create\u002B0x2d/0x50 [ 3437.466352]        bch2_fs_file_ioctl\u002B0x2ec/0xc90 [bcachefs] [ 3437.466617]        __x64_sys_ioctl\u002B0x93/0xd0 [ 3437.466791]        do_syscall_64\u002B0x42/0xf0 [ 3437.466957]        entry_SYSCALL_64_after_hwframe\u002B0x6e/0x76 [ 3437.467180]                other info that might help us debug this:  [ 3437.469670] 2 locks held by bcachefs/35533:                other info that might help us debug this:  [ 3437.467507] Chain exists of:                  sb_writers#10 --\u003E \u0026c-\u003Esnapshot_create_lock --\u003E \u0026type-\u003Es_umount_key#48  [ 3437.467979]  Possible unsafe locking scenario:  [ 3437.468223]        CPU0                    CPU1 [ 3437.468405]        ----                    ---- [ 3437.468585]   rlock(\u0026type-\u003Es_umount_key#48); [ 3437.468758]                                lock(\u0026c-\u003Esnapshot_create_lock); [ 3437.469030]                                lock(\u0026type-\u003Es_umount_key#48); [ 3437.469291]   rlock(sb_writers#10); [ 3437.469434]                 *** DEADLOCK ***  [ 3437.469 ---truncated---",
  "published": "2024-04-02T07:15:42Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00148,
  "epssPercentile": 0.04005,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.7.7-1",
      "fix": "DEBIAN-CVE-2024-26658",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-26658",
      "released": "2024-04-02T07:15:42Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.7.7-1",
      "fix": "DEBIAN-CVE-2024-26658",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-26658",
      "released": "2024-04-02T07:15:42Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}