CVE-2026-43046

Debilidad

In the Linux kernel, the following vulnerability has been resolved: btrfs: reject root items with drop_progress and zero drop_level [BUG] When recovering relocation at mount time, merge_reloc_root() and btrfs_drop_snapshot() both use BUG_ON(level == 0) to guard against an impossible state: a non-zero drop_progress combined with a zero drop_level in a root_item, which can be triggered: ------------[ cut here ]------------ kernel BUG at fs/btrfs/relocation.c:1545! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 283 ... Tainted: 6.18.0+ #16 PREEMPT(voluntary) Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU Ubuntu 24.04 PC v2, BIOS 1.16.3-debian-1.16.3-2 RIP: 0010:merge_reloc_root+0x1266/0x1650 fs/btrfs/relocation.c:1545 Code: ffff0000 00004589 d7e9acfa ffffe8a1 79bafebe 02000000 Call Trace: merge_reloc_roots+0x295/0x890 fs/btrfs/relocation.c:1861 btrfs_recover_relocation+0xd6e/0x11d0 fs/btrfs/relocation.c:4195 btrfs_start_pre_rw_mount+0xa4d/0x1810 fs/btrfs/disk-io.c:3130 open_ctree+0x5824/0x5fe0 fs/btrfs/disk-io.c:3640 btrfs_fill_super fs/btrfs/super.c:987 [inline] btrfs_get_tree_super fs/btrfs/super.c:1951 [inline] btrfs_get_tree_subvol fs/btrfs/su

Productos afectados

• linux linux_kernel

Referencias

• https://git.kernel.org/stable/c/295f8075d00442d71dc9ccae421ace1c0d2d9224
• https://git.kernel.org/stable/c/53ceedd1eb6280ca8359664e0226983eded2ed73
• https://git.kernel.org/stable/c/850de3d87f4720b71ccdcd44f4aa57e46b53a3f3
• https://git.kernel.org/stable/c/ac68a9a8e481ab1becaed29d6d23087dac3de15d
• https://git.kernel.org/stable/c/b17b79ff896305fd74980a5f72afec370ee88ca4
• https://git.kernel.org/stable/c/bedaf7d0b9d793e116f16b4d9a7dbc94bcc80443