{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23214",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23214"
  ],
  "published": "2026-02-18T14:22:37Z",
  "summary": "btrfs: reject new transactions if the fs is fully read-only",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: reject new transactions if the fs is fully read-only\n\n[BUG]\nThere is a bug report where a heavily fuzzed fs is mounted with all\nrescue mount options, which leads to the following warnings during\nunmount:\n\n  BTRFS: Transaction aborted (error -22)\n  Modules linked in:\n  CPU: 0 UID: 0 PID: 9758 Comm: repro.out Not tainted\n  6.19.0-rc5-00002-gb71e635feefc #7 PREEMPT(full)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  RIP: 0010:find_free_extent_update_loop fs/btrfs/extent-tree.c:4208 [inline]\n  RIP: 0010:find_free_extent+0x52f0/0x5d20 fs/btrfs/extent-tree.c:4611\n  Call Trace:\n   <TASK>\n   btrfs_reserve_extent+0x2cd/0x790 fs/btrfs/extent-tree.c:4705\n   btrfs_alloc_tree_block+0x1e1/0x10e0 fs/btrfs/extent-tree.c:5157\n   btrfs_force_cow_block+0x578/0x2410 fs/btrfs/ctree.c:517\n   btrfs_cow_block+0x3c4/0xa80 fs/btrfs/ctree.c:708\n   btrfs_search_slot+0xcad/0x2b50 fs/btrfs/ctree.c:2130\n   btrfs_truncate_inode_items+0x45d/0x2350 fs/btrfs/inode-item.c:499\n   btrfs_evict_inode+0x923/0xe70 fs/btrfs/inode.c:5628\n   evict+0x5f4/0xae0 fs/inode.c:837\n   __dentry_kill+0x209/0x660 fs/dcache.c:670\n   finish_dput+0xc9/0x480 fs/dcache.c:879\n   shrink_dcache_for_umount+0xa0/0x170 fs/dcache.c:1661\n   generic_shutdown_super+0x67/0x2c0 fs/super.c:621\n   kill_anon_super+0x3b/0x70 fs/super.c:1289\n   btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2127\n   deactivate_locked_super+0xbc/0x130 fs/super.c:474\n   cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318\n   task_work_run+0x1d4/0x260 kernel/task_work.c:233\n   exit_task_work include/linux/task_work.h:40 [inline]\n   do_exit+0x694/0x22f0 kernel/exit.c:971\n   do_group_exit+0x21c/0x2d0 kernel/exit.c:1112\n   __do_sys_exit_group kernel/exit.c:1123 [inline]\n   __se_sys_exit_group kernel/exit.c:1121 [inline]\n   __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1121\n   x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xe8/0xf80 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x44f639\n  Code: Unable to access opcode bytes at 0x44f60f.\n  RSP: 002b:00007ffc15c4e088 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\n  RAX: ffffffffffffffda RBX: 00000000004c32f0 RCX: 000000000044f639\n  RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001\n  RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 0000000000000000\n  R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004c32f0\n  R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n   </TASK>\n\nSince rescue mount options will mark the full fs read-only, there should\nbe no new transaction triggered.\n\nBut during unmount we will evict all inodes, which can trigger a new\ntransaction, and triggers warnings on a heavily corrupted fs.\n\n[CAUSE]\nBtrfs allows new transaction even on a read-only fs, this is to allow\nlog replay happen even on read-only mounts, just like what ext4/xfs do.\n\nHowever with rescue mount options, the fs is fully read-only and cannot\nbe remounted read-write, thus in that case we should also reject any new\ntransactions.\n\n[FIX]\nIf we find the fs has rescue mount options, we should treat the fs as\nerror, so that no new transaction can be started.",
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