{
  "cveId": "CVE-2025-21754",
  "url": "https://patchblox.com/security/cve/CVE-2025-21754",
  "summary": "CVE-2025-21754 is fixed in 61 products on 1 platform, first by DEBIAN-CVE-2025-21754, released February 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix assertion failure when splitting orde...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix assertion failure when splitting ordered extent after transaction abort  If while we are doing a direct IO write a transaction abort happens, we mark all existing ordered extents with the BTRFS_ORDERED_IOERR flag (done at btrfs_destroy_ordered_extents()), and then after that if we enter btrfs_split_ordered_extent() and the ordered extent has bytes left (meaning we have a bio that doesn\u0027t cover the whole ordered extent, see details at btrfs_extract_ordered_extent()), we will fail on the following assertion at btrfs_split_ordered_extent():     ASSERT(!(flags \u0026 ~BTRFS_ORDERED_TYPE_FLAGS));  because the BTRFS_ORDERED_IOERR flag is set and the definition of BTRFS_ORDERED_TYPE_FLAGS is just the union of all flags that identify the type of write (regular, nocow, prealloc, compressed, direct IO, encoded).  Fix this by returning an error from btrfs_extract_ordered_extent() if we find the BTRFS_ORDERED_IOERR flag in the ordered extent. The error will be the error that resulted in the transaction abort or -EIO if no transaction abort happened.  This was recently reported by syzbot with the following trace:     FAULT_INJECTION: forcing a failure.    name failslab, interval 1, probability 0, space 0, times 1    CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted 6.13.0-rc5-syzkaller #0    Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12\u002B1 04/01/2014    Call Trace:     \u003CTASK\u003E     __dump_stack lib/dump_stack.c:94 [inline]     dump_stack_lvl\u002B0x241/0x360 lib/dump_stack.c:120     fail_dump lib/fault-inject.c:53 [inline]     should_fail_ex\u002B0x3b0/0x4e0 lib/fault-inject.c:154     should_failslab\u002B0xac/0x100 mm/failslab.c:46     slab_pre_alloc_hook mm/slub.c:4072 [inline]     slab_alloc_node mm/slub.c:4148 [inline]     __do_kmalloc_node mm/slub.c:4297 [inline]     __kmalloc_noprof\u002B0xdd/0x4c0 mm/slub.c:4310     kmalloc_noprof include/linux/slab.h:905 [inline]     kzalloc_noprof include/linux/slab.h:1037 [inline]     btrfs_chunk_alloc_add_chunk_item\u002B0x244/0x1100 fs/btrfs/volumes.c:5742     reserve_chunk_space\u002B0x1ca/0x2c0 fs/btrfs/block-group.c:4292     check_system_chunk fs/btrfs/block-group.c:4319 [inline]     do_chunk_alloc fs/btrfs/block-group.c:3891 [inline]     btrfs_chunk_alloc\u002B0x77b/0xf80 fs/btrfs/block-group.c:4187     find_free_extent_update_loop fs/btrfs/extent-tree.c:4166 [inline]     find_free_extent\u002B0x42d1/0x5810 fs/btrfs/extent-tree.c:4579     btrfs_reserve_extent\u002B0x422/0x810 fs/btrfs/extent-tree.c:4672     btrfs_new_extent_direct fs/btrfs/direct-io.c:186 [inline]     btrfs_get_blocks_direct_write\u002B0x706/0xfa0 fs/btrfs/direct-io.c:321     btrfs_dio_iomap_begin\u002B0xbb7/0x1180 fs/btrfs/direct-io.c:525     iomap_iter\u002B0x697/0xf60 fs/iomap/iter.c:90     __iomap_dio_rw\u002B0xeb9/0x25b0 fs/iomap/direct-io.c:702     btrfs_dio_write fs/btrfs/direct-io.c:775 [inline]     btrfs_direct_write\u002B0x610/0xa30 fs/btrfs/direct-io.c:880     btrfs_do_write_iter\u002B0x2a0/0x760 fs/btrfs/file.c:1397     do_iter_readv_writev\u002B0x600/0x880     vfs_writev\u002B0x376/0xba0 fs/read_write.c:1050     do_pwritev fs/read_write.c:1146 [inline]     __do_sys_pwritev2 fs/read_write.c:1204 [inline]     __se_sys_pwritev2\u002B0x196/0x2b0 fs/read_write.c:1195     do_syscall_x64 arch/x86/entry/common.c:52 [inline]     do_syscall_64\u002B0xf3/0x230 arch/x86/entry/common.c:83     entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f    RIP: 0033:0x7f1281f85d29    RSP: 002b:00007f12819fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148    RAX: ffffffffffffffda RBX: 00007f1282176080 RCX: 00007f1281f85d29    RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000005    RBP: 00007f12819fe090 R08: 0000000000000000 R09: 0000000000000003    R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000002    R13: 0000000000000000 R14: 00007f1282176080 R15: 00007ffcb9e23328     \u003C/TASK\u003E    BTRFS error (device loop0 state A): Transaction aborted (error -12)    BTRFS: error (device loop0 state A ---truncated---",
  "published": "2025-02-27T03:15:16Z",
  "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": 0.00234,
  "epssPercentile": 0.14348,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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