CVE-2023-53339 (GCVE-0-2023-53339)

Vulnerability from cvelistv5 – Published: 2025-09-17 14:56 – Updated: 2026-05-11 19:43
VLAI
Title
btrfs: fix BUG_ON condition in btrfs_cancel_balance
Summary
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: 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); > }
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ddf7e8984c83aee9122552529f4e77291903f8d9 , < ceb9ba8e30833a4823e2dc73f80ebcdf2498d01a (git)
Affected: 72efe5d44821e38540888a5fe3ff3d0faab6acad , < ae81329f7de3aa6f34ecdfa5412e72161a30e9ce (git)
Affected: b19c98f237cd76981aaded52c258ce93f7daa8cb , < 29eefa6d0d07e185f7bfe9576f91e6dba98189c2 (git)
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Linux Linux Affected: 6.1.42 , < 6.1.47 (semver)
Affected: 6.4.7 , < 6.4.12 (semver)
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{
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          "product": "Linux",
          "programFiles": [
            "fs/btrfs/volumes.c"
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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   \u003cTASK\u003e\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  \u003e mutex_unlock(\u0026fs_info-\u003ebalance_mutex);\n  \u003e --------------------\n  \u003e .......issue pause and cancel req in another thread\n  \u003e --------------------\n  \u003e ret = __btrfs_balance(fs_info);\n  \u003e\n  \u003e mutex_lock(\u0026fs_info-\u003ebalance_mutex);\n  \u003e if (ret == -ECANCELED \u0026\u0026 atomic_read(\u0026fs_info-\u003ebalance_pause_req)) {\n  \u003e         btrfs_info(fs_info, \"balance: paused\");\n  \u003e         btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);\n  \u003e }"
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    "dateReserved": "2025-09-16T16:08:59.565Z",
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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