# cveboard — Historical CVE brief

## Instructions for the operator's AI
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Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.

## Source facts (JSON-quoted data)
CNA source text (English)
id: "CVE-2026-23214"
idYear: 2026
status: "PUBLISHED"
publishedAt: "2026-02-18T14:21:51.507Z"
updatedAt: "2026-10-21T12:38:59.400Z"
importedAt: "2026-10-24T01:58:02.025Z"
snapshot: {"id":"cve_2026-10-24_midnight_baseline","at":"2026-10-24T00:00:00.000Z","source":"https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"}
url: "https://cveboard.org/cve/CVE-2026-23214"
json: "https://cveboard.org/cve/CVE-2026-23214.json"
sourceURL: "https://www.cve.org/CVERecord?id=CVE-2026-23214"
title: "btrfs: reject new transactions if the fs is fully read-only"
summary: "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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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."
affected: [{"versions":[{"version":"42437a6386ffeaaf200731e73d723ea491f3fe7d","status":"affected","versionType":"git","lessThan":"34614f5dd26c8257aafcdaf1053a797289359664"},{"version":"42437a6386ffeaaf200731e73d723ea491f3fe7d","status":"affected","versionType":"git","lessThan":"a928eecf030a9a5dc5f5ca98332699f379b91963"},{"version":"42437a6386ffeaaf200731e73d723ea491f3fe7d","status":"affected","versionType":"git","lessThan":"3228b2eceb6c3d7e237f8a5330113dbd164fb90d"},{"version":"42437a6386ffeaaf200731e73d723ea491f3fe7d","status":"affected","versionType":"git","lessThan":"1972f44c189c8aacde308fa9284e474c1a5cbd9f"}],"vendor":"Linux","product":"Linux","defaultStatus":"unaffected"},{"versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","versionType":"semver","lessThan":"5.11"},{"version":"6.6.160","status":"unaffected","versionType":"semver","lessThanOrEqual":"6.6.*"},{"version":"6.12.70","status":"unaffected","versionType":"semver","lessThanOrEqual":"6.12.*"},{"version":"6.18.10","status":"unaffected","versionType":"semver","lessThanOrEqual":"6.18.*"},{"version":"6.19","status":"unaffected","versionType":"original_commit_for_fix","lessThanOrEqual":"*"}],"vendor":"Linux","product":"Linux","defaultStatus":"affected"}]

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