CVE-2025-71237 (GCVE-0-2025-71237)

Vulnerability from cvelistv5 – Published: 2026-02-18 14:53 – Updated: 2026-05-11 21:56
VLAI
Title
nilfs2: Fix potential block overflow that cause system hang
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: Fix potential block overflow that cause system hang When a user executes the FITRIM command, an underflow can occur when calculating nblocks if end_block is too small. Since nblocks is of type sector_t, which is u64, a negative nblocks value will become a very large positive integer. This ultimately leads to the block layer function __blkdev_issue_discard() taking an excessively long time to process the bio chain, and the ns_segctor_sem lock remains held for a long period. This prevents other tasks from acquiring the ns_segctor_sem lock, resulting in the hang reported by syzbot in [1]. If the ending block is too small, typically if it is smaller than 4KiB range, depending on the usage of the segment 0, it may be possible to attempt a discard request beyond the device size causing the hang. Exiting successfully and assign the discarded size (0 in this case) to range->len. Although the start and len values in the user input range are too small, a conservative strategy is adopted here to safely ignore them, which is equivalent to a no-op; it will not perform any trimming and will not throw an error. [1] task:segctord state:D stack:28968 pid:6093 tgid:6093 ppid:2 task_flags:0x200040 flags:0x00080000 Call Trace: rwbase_write_lock+0x3dd/0x750 kernel/locking/rwbase_rt.c:272 nilfs_transaction_lock+0x253/0x4c0 fs/nilfs2/segment.c:357 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2569 [inline] nilfs_segctor_thread+0x6ec/0xe00 fs/nilfs2/segment.c:2684 [ryusuke: corrected part of the commit message about the consequences]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < 6457d3ee41a4c15082ac49c5aa7fb933b4a043f3 (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6 (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < 2438982f635e6cc2009be68ba2efb2998727d8d4 (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < df1e20796c9f3d541cca47fb72e4369ea135642d (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < ea2278657ad0d62596589fbe2caf995e189e65e7 (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < 4aa45f841413cca81882602b4042c53502f34cad (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < b8c5ee234bd54f1447c846101fdaef2cf70c2149 (git)
Affected: 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 , < ed527ef0c264e4bed6c7b2a158ddf516b17f5f66 (git)
Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.251 , ≤ 5.10.* (semver)
Unaffected: 5.15.201 , ≤ 5.15.* (semver)
Unaffected: 6.1.164 , ≤ 6.1.* (semver)
Unaffected: 6.6.125 , ≤ 6.6.* (semver)
Unaffected: 6.12.72 , ≤ 6.12.* (semver)
Unaffected: 6.18.11 , ≤ 6.18.* (semver)
Unaffected: 6.19.1 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: Fix potential block overflow that cause system hang\n\nWhen a user executes the FITRIM command, an underflow can occur when\ncalculating nblocks if end_block is too small. Since nblocks is of\ntype sector_t, which is u64, a negative nblocks value will become a\nvery large positive integer. This ultimately leads to the block layer\nfunction __blkdev_issue_discard() taking an excessively long time to\nprocess the bio chain, and the ns_segctor_sem lock remains held for a\nlong period. This prevents other tasks from acquiring the ns_segctor_sem\nlock, resulting in the hang reported by syzbot in [1].\n\nIf the ending block is too small, typically if it is smaller than 4KiB\nrange, depending on the usage of the segment 0, it may be possible to\nattempt a discard request beyond the device size causing the hang.\n\nExiting successfully and assign the discarded size (0 in this case)\nto range-\u003elen.\n\nAlthough the start and len values in the user input range are too small,\na conservative strategy is adopted here to safely ignore them, which is\nequivalent to a no-op; it will not perform any trimming and will not\nthrow an error.\n\n[1]\ntask:segctord state:D stack:28968 pid:6093 tgid:6093  ppid:2 task_flags:0x200040 flags:0x00080000\nCall Trace:\n rwbase_write_lock+0x3dd/0x750 kernel/locking/rwbase_rt.c:272\n nilfs_transaction_lock+0x253/0x4c0 fs/nilfs2/segment.c:357\n nilfs_segctor_thread_construct fs/nilfs2/segment.c:2569 [inline]\n nilfs_segctor_thread+0x6ec/0xe00 fs/nilfs2/segment.c:2684\n\n[ryusuke: corrected part of the commit message about the consequences]"
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    "dateUpdated": "2026-05-11T21:56:59.574Z",
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This prevents other tasks from acquiring the ns_segctor_sem\\nlock, resulting in the hang reported by syzbot in [1].\\n\\nIf the ending block is too small, typically if it is smaller than 4KiB\\nrange, depending on the usage of the segment 0, it may be possible to\\nattempt a discard request beyond the device size causing the hang.\\n\\nExiting successfully and assign the discarded size (0 in this case)\\nto range-\u003elen.\\n\\nAlthough the start and len values in the user input range are too small,\\na conservative strategy is adopted here to safely ignore them, which is\\nequivalent to a no-op; it will not perform any trimming and will not\\nthrow an error.\\n\\n[1]\\ntask:segctord state:D stack:28968 pid:6093 tgid:6093  ppid:2 task_flags:0x200040 flags:0x00080000\\nCall Trace:\\n rwbase_write_lock+0x3dd/0x750 kernel/locking/rwbase_rt.c:272\\n nilfs_transaction_lock+0x253/0x4c0 fs/nilfs2/segment.c:357\\n nilfs_segctor_thread_construct fs/nilfs2/segment.c:2569 [inline]\\n nilfs_segctor_thread+0x6ec/0xe00 fs/nilfs2/segment.c:2684\\n\\n[ryusuke: corrected part of the commit message about the consequences]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnilfs2: Corrige un posible desbordamiento de bloque que causa un cuelgue del sistema\\n\\nCuando un usuario ejecuta el comando FITRIM, puede ocurrir un subdesbordamiento al calcular nblocks si end_block es demasiado peque\u00f1o. Dado que nblocks es de tipo sector_t, que es u64, un valor negativo de nblocks se convertir\u00e1 en un entero positivo muy grande. Esto finalmente lleva a que la funci\u00f3n de la capa de bloques __blkdev_issue_discard() tarde un tiempo excesivamente largo en procesar la cadena bio, y el bloqueo ns_segctor_sem permanezca retenido durante un largo per\u00edodo. 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.