{
  "public_date" : "2025-04-16T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: btrfs: fix block group refcount race in btrfs_create_pending_block_groups()",
    "id" : "2360254",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2360254"
  },
  "cwe" : "CWE-362",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: fix block group refcount race in btrfs_create_pending_block_groups()\nBlock group creation is done in two phases, which results in a slightly\nunintuitive property: a block group can be allocated/deallocated from\nafter btrfs_make_block_group() adds it to the space_info with\nbtrfs_add_bg_to_space_info(), but before creation is completely completed\nin btrfs_create_pending_block_groups(). As a result, it is possible for a\nblock group to go unused and have 'btrfs_mark_bg_unused' called on it\nconcurrently with 'btrfs_create_pending_block_groups'. This causes a\nnumber of issues, which were fixed with the block group flag\n'BLOCK_GROUP_FLAG_NEW'.\nHowever, this fix is not quite complete. Since it does not use the\nunused_bg_lock, it is possible for the following race to occur:\nbtrfs_create_pending_block_groups            btrfs_mark_bg_unused\nif list_empty // false\nlist_del_init\nclear_bit\nelse if (test_bit) // true\nlist_move_tail\nAnd we get into the exact same broken ref count and invalid new_bgs\nstate for transaction cleanup that BLOCK_GROUP_FLAG_NEW was designed to\nprevent.\nThe broken refcount aspect will result in a warning like:\n[1272.943527] refcount_t: underflow; use-after-free.\n[1272.943967] WARNING: CPU: 1 PID: 61 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x110\n[1272.944731] Modules linked in: btrfs virtio_net xor zstd_compress raid6_pq null_blk [last unloaded: btrfs]\n[1272.945550] CPU: 1 UID: 0 PID: 61 Comm: kworker/u32:1 Kdump: loaded Tainted: G        W          6.14.0-rc5+ #108\n[1272.946368] Tainted: [W]=WARN\n[1272.946585] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014\n[1272.947273] Workqueue: btrfs_discard btrfs_discard_workfn [btrfs]\n[1272.947788] RIP: 0010:refcount_warn_saturate+0xba/0x110\n[1272.949532] RSP: 0018:ffffbf1200247df0 EFLAGS: 00010282\n[1272.949901] RAX: 0000000000000000 RBX: ffffa14b00e3f800 RCX: 0000000000000000\n[1272.950437] RDX: 0000000000000000 RSI: ffffbf1200247c78 RDI: 00000000ffffdfff\n[1272.950986] RBP: ffffa14b00dc2860 R08: 00000000ffffdfff R09: ffffffff90526268\n[1272.951512] R10: ffffffff904762c0 R11: 0000000063666572 R12: ffffa14b00dc28c0\n[1272.952024] R13: 0000000000000000 R14: ffffa14b00dc2868 R15: 000001285dcd12c0\n[1272.952850] FS:  0000000000000000(0000) GS:ffffa14d33c40000(0000) knlGS:0000000000000000\n[1272.953458] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1272.953931] CR2: 00007f838cbda000 CR3: 000000010104e000 CR4: 00000000000006f0\n[1272.954474] Call Trace:\n[1272.954655]  <TASK>\n[1272.954812]  ? refcount_warn_saturate+0xba/0x110\n[1272.955173]  ? __warn.cold+0x93/0xd7\n[1272.955487]  ? refcount_warn_saturate+0xba/0x110\n[1272.955816]  ? report_bug+0xe7/0x120\n[1272.956103]  ? handle_bug+0x53/0x90\n[1272.956424]  ? exc_invalid_op+0x13/0x60\n[1272.956700]  ? asm_exc_invalid_op+0x16/0x20\n[1272.957011]  ? refcount_warn_saturate+0xba/0x110\n[1272.957399]  btrfs_discard_cancel_work.cold+0x26/0x2b [btrfs]\n[1272.957853]  btrfs_put_block_group.cold+0x5d/0x8e [btrfs]\n[1272.958289]  btrfs_discard_workfn+0x194/0x380 [btrfs]\n[1272.958729]  process_one_work+0x130/0x290\n[1272.959026]  worker_thread+0x2ea/0x420\n[1272.959335]  ? __pfx_worker_thread+0x10/0x10\n[1272.959644]  kthread+0xd7/0x1c0\n[1272.959872]  ? __pfx_kthread+0x10/0x10\n[1272.960172]  ret_from_fork+0x30/0x50\n[1272.960474]  ? __pfx_kthread+0x10/0x10\n[1272.960745]  ret_from_fork_asm+0x1a/0x30\n[1272.961035]  </TASK>\n[1272.961238] ---[ end trace 0000000000000000 ]---\nThough we have seen them in the async discard workfn as well. It is\nmost likely to happen after a relocation finishes which cancels discard,\ntears down the block group, etc.\nFix this fully by taking the lock arou\n---truncated---" ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-22115\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-22115\nhttps://lore.kernel.org/linux-cve-announce/2025041626-CVE-2025-22115-857c@gregkh/T" ],
  "name" : "CVE-2025-22115",
  "csaw" : false
}