{"id":"CVE-2025-71237","state":"PUBLISHED","title":"nilfs2: Fix potential block overflow that cause system hang","description":"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->len.\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]","publishedAt":"2026-02-18T14:53:22.436Z","updatedAt":"2026-05-11T21:56:59.574Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"6457d3ee41a4c15082ac49c5aa7fb933b4a043f3","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"2438982f635e6cc2009be68ba2efb2998727d8d4","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"df1e20796c9f3d541cca47fb72e4369ea135642d","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"ea2278657ad0d62596589fbe2caf995e189e65e7","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"4aa45f841413cca81882602b4042c53502f34cad","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"b8c5ee234bd54f1447c846101fdaef2cf70c2149","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"ed527ef0c264e4bed6c7b2a158ddf516b17f5f66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/sufile.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.251","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.201","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.164","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.125","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.72","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.11","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.1","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/sufile.c"]}],"references":["https://git.kernel.org/stable/c/6457d3ee41a4c15082ac49c5aa7fb933b4a043f3","https://git.kernel.org/stable/c/ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6","https://git.kernel.org/stable/c/2438982f635e6cc2009be68ba2efb2998727d8d4","https://git.kernel.org/stable/c/df1e20796c9f3d541cca47fb72e4369ea135642d","https://git.kernel.org/stable/c/ea2278657ad0d62596589fbe2caf995e189e65e7","https://git.kernel.org/stable/c/4aa45f841413cca81882602b4042c53502f34cad","https://git.kernel.org/stable/c/b8c5ee234bd54f1447c846101fdaef2cf70c2149","https://git.kernel.org/stable/c/ed527ef0c264e4bed6c7b2a158ddf516b17f5f66"],"weaknesses":[],"ingestedAt":"2026-10-29T20:10:04.440Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/71xxx/CVE-2025-71237.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-71237","state":"PUBLISHED","datePublished":"2026-02-18T14:53:22.436Z","dateUpdated":"2026-05-11T21:56:59.574Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-02-18T14:25:13.845Z"},"containers":{"cna":{"title":"nilfs2: Fix potential block overflow that cause system hang","descriptions":[{"lang":"en","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->len.\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]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"6457d3ee41a4c15082ac49c5aa7fb933b4a043f3","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"2438982f635e6cc2009be68ba2efb2998727d8d4","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"df1e20796c9f3d541cca47fb72e4369ea135642d","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"ea2278657ad0d62596589fbe2caf995e189e65e7","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"4aa45f841413cca81882602b4042c53502f34cad","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"b8c5ee234bd54f1447c846101fdaef2cf70c2149","versionType":"git"},{"version":"82e11e857be3ffd2a0a952c9db8aa2379e2b9e44","status":"affected","lessThan":"ed527ef0c264e4bed6c7b2a158ddf516b17f5f66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/sufile.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.251","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.201","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.164","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.125","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.72","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.11","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.1","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/sufile.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6457d3ee41a4c15082ac49c5aa7fb933b4a043f3"},{"url":"https://git.kernel.org/stable/c/ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6"},{"url":"https://git.kernel.org/stable/c/2438982f635e6cc2009be68ba2efb2998727d8d4"},{"url":"https://git.kernel.org/stable/c/df1e20796c9f3d541cca47fb72e4369ea135642d"},{"url":"https://git.kernel.org/stable/c/ea2278657ad0d62596589fbe2caf995e189e65e7"},{"url":"https://git.kernel.org/stable/c/4aa45f841413cca81882602b4042c53502f34cad"},{"url":"https://git.kernel.org/stable/c/b8c5ee234bd54f1447c846101fdaef2cf70c2149"},{"url":"https://git.kernel.org/stable/c/ed527ef0c264e4bed6c7b2a158ddf516b17f5f66"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:56:59.574Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.10.251"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.15.201"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.164"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.125"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.72"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.19.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}