CVE-2023-53339
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix BUG_ON condition in btrfs_cancel_balance
Pausing and canceling balance can race to interrupt balance lead to BUG_ON panic in btrfs_cancel_balance. The BUG_ON condition in btrfs_cancel_balance does not take this race scenario into account.
However, the race condition has no other side effects. We can fix that.
Reproducing it with panic trace like this:
Detalles técnicos trazas, registros y código del informe original
kernel BUG at fs/btrfs/volumes.c:4618!
RIP: 0010:btrfs_cancel_balance+0x5cf/0x6a0
Call Trace:
<TASK>
? do_nanosleep+0x60/0x120
? hrtimer_nanosleep+0xb7/0x1a0
? sched_core_clone_cookie+0x70/0x70
btrfs_ioctl_balance_ctl+0x55/0x70
btrfs_ioctl+0xa46/0xd20
__x64_sys_ioctl+0x7d/0xa0
do_syscall_64+0x38/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Race scenario as follows:
> mutex_unlock(&fs_info->balance_mutex);
> --------------------
> .......issue pause and cancel req in another thread
> --------------------
> ret = __btrfs_balance(fs_info);
>
> mutex_lock(&fs_info->balance_mutex);
> if (ret == -ECANCELED && atomic_read(&fs_info->balance_pause_req)) {
> btrfs_info(fs_info, "balance: paused");
> btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
> }CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-617
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix BUG_ON condition in btrfs_cancel_balance\n\nPausing and canceling balance can race to interrupt balance lead to BUG_ON\npanic in btrfs_cancel_balance. The BUG_ON condition in btrfs_cancel_balance\ndoes not take this race scenario into account.\n\nHowever, the race condition has no other side effects. We can fix that.\n\nReproducing it with panic trace like this:\n\n kernel BUG at fs/btrfs/volumes.c:4618!\n RIP: 0010:btrfs_cancel_balance+0x5cf/0x6a0\n Call Trace:\n <TASK>\n ? do_nanosleep+0x60/0x120\n ? hrtimer_nanosleep+0xb7/0x1a0\n ? sched_core_clone_cookie+0x70/0x70\n btrfs_ioctl_balance_ctl+0x55/0x70\n btrfs_ioctl+0xa46/0xd20\n __x64_sys_ioctl+0x7d/0xa0\n do_syscall_64+0x38/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n Race scenario as follows:\n > mutex_unlock(&fs_info->balance_mutex);\n > --------------------\n > .......issue pause and cancel req in another thread\n > --------------------\n > ret = __btrfs_balance(fs_info);\n >\n > mutex_lock(&fs_info->balance_mutex);\n > if (ret == -ECANCELED && atomic_read(&fs_info->balance_pause_req)) {\n > btrfs_info(fs_info, \"balance: paused\");\n > btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);\n > }"
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