{"api_version":"1","generated_at":"2026-07-24T21:09:55+00:00","cve":"CVE-2025-38626","urls":{"html":"https://cve.report/CVE-2025-38626","api":"https://cve.report/api/cve/CVE-2025-38626.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-38626","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-38626"},"summary":{"title":"f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode\n\nw/ \"mode=lfs\" mount option, generic/299 will cause system panic as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2835!\nCall Trace:\n <TASK>\n f2fs_allocate_data_block+0x6f4/0xc50\n f2fs_map_blocks+0x970/0x1550\n f2fs_iomap_begin+0xb2/0x1e0\n iomap_iter+0x1d6/0x430\n __iomap_dio_rw+0x208/0x9a0\n f2fs_file_write_iter+0x6b3/0xfa0\n aio_write+0x15d/0x2e0\n io_submit_one+0x55e/0xab0\n __x64_sys_io_submit+0xa5/0x230\n do_syscall_64+0x84/0x2f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0010:new_curseg+0x70f/0x720\n\nThe root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may\ntrigger foreground gc only if it allocates any physical block, it will be\na little bit later when there is multiple threads writing data w/\naio/dio/bufio method in parallel, since we always use OPU in lfs mode, so\nf2fs_map_blocks() does block allocations aggressively.\n\nIn order to fix this issue, let's give a chance to trigger foreground\ngc in prior to block allocation in f2fs_map_blocks().","state":"PUBLISHED","assigner":"Linux","published_at":"2025-08-22 16:15:36","updated_at":"2026-06-01 17:16:35"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5","name":"https://git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5","name":"https://git.kernel.org/stable/c/d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee","name":"https://git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c737047f4665232d1e26b3620bc62df334545451","name":"https://git.kernel.org/stable/c/c737047f4665232d1e26b3620bc62df334545451","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968","name":"https://git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791","name":"https://git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253","name":"https://git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-38626","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38626","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 c737047f4665232d1e26b3620bc62df334545451 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 f289690f50a01c3e085d87853392d5b7436a4cee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 82765ce5c7a56f9309ee45328e763610eaf11253 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 385e64a0744584397b4b52b27c96703516f39968 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36abef4e796d382e81a0c2d21ea5327481dd7154 1005a3ca28e90c7a64fa43023f866b960a60f791 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.102 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.42 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15.10 6.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16.1 6.16.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2025","cve_id":"38626","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/f2fs/data.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c737047f4665232d1e26b3620bc62df334545451","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"},{"lessThan":"d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"},{"lessThan":"f289690f50a01c3e085d87853392d5b7436a4cee","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"},{"lessThan":"82765ce5c7a56f9309ee45328e763610eaf11253","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"},{"lessThan":"264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"},{"lessThan":"385e64a0744584397b4b52b27c96703516f39968","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"},{"lessThan":"1005a3ca28e90c7a64fa43023f866b960a60f791","status":"affected","version":"36abef4e796d382e81a0c2d21ea5327481dd7154","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/f2fs/data.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.8"},{"lessThan":"4.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.102","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.42","versionType":"semver"},{"lessThanOrEqual":"6.15.*","status":"unaffected","version":"6.15.10","versionType":"semver"},{"lessThanOrEqual":"6.16.*","status":"unaffected","version":"6.16.1","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.17","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.102","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.42","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.15.10","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.16.1","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17","versionStartIncluding":"4.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode\n\nw/ \"mode=lfs\" mount option, generic/299 will cause system panic as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2835!\nCall Trace:\n <TASK>\n f2fs_allocate_data_block+0x6f4/0xc50\n f2fs_map_blocks+0x970/0x1550\n f2fs_iomap_begin+0xb2/0x1e0\n iomap_iter+0x1d6/0x430\n __iomap_dio_rw+0x208/0x9a0\n f2fs_file_write_iter+0x6b3/0xfa0\n aio_write+0x15d/0x2e0\n io_submit_one+0x55e/0xab0\n __x64_sys_io_submit+0xa5/0x230\n do_syscall_64+0x84/0x2f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0010:new_curseg+0x70f/0x720\n\nThe root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may\ntrigger foreground gc only if it allocates any physical block, it will be\na little bit later when there is multiple threads writing data w/\naio/dio/bufio method in parallel, since we always use OPU in lfs mode, so\nf2fs_map_blocks() does block allocations aggressively.\n\nIn order to fix this issue, let's give a chance to trigger foreground\ngc in prior to block allocation in f2fs_map_blocks()."}],"providerMetadata":{"dateUpdated":"2026-06-01T16:05:25.352Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c737047f4665232d1e26b3620bc62df334545451"},{"url":"https://git.kernel.org/stable/c/d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5"},{"url":"https://git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee"},{"url":"https://git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253"},{"url":"https://git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5"},{"url":"https://git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968"},{"url":"https://git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791"}],"title":"f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-38626","datePublished":"2025-08-22T16:00:34.867Z","dateReserved":"2025-04-16T04:51:24.029Z","dateUpdated":"2026-06-01T16:05:25.352Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-08-22 16:15:36","lastModifiedDate":"2026-06-01 17:16:35","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.102","matchCriteriaId":"DA9CAA58-80C7-48D4-A774-66C1C7B0CA0A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.42","matchCriteriaId":"EA7AA5E6-4376-4A85-A021-6ACC5FF801C3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.15.10","matchCriteriaId":"5890C690-B295-40C2-9121-FF5F987E5142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.16.1","matchCriteriaId":"58182352-D7DF-4CC9-841E-03C1D852C3FB"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"38626","Ordinal":"1","Title":"f2fs: fix to trigger foreground gc during f2fs_map_blocks() in l","CVE":"CVE-2025-38626","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"38626","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode\n\nw/ \"mode=lfs\" mount option, generic/299 will cause system panic as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2835!\nCall Trace:\n <TASK>\n f2fs_allocate_data_block+0x6f4/0xc50\n f2fs_map_blocks+0x970/0x1550\n f2fs_iomap_begin+0xb2/0x1e0\n iomap_iter+0x1d6/0x430\n __iomap_dio_rw+0x208/0x9a0\n f2fs_file_write_iter+0x6b3/0xfa0\n aio_write+0x15d/0x2e0\n io_submit_one+0x55e/0xab0\n __x64_sys_io_submit+0xa5/0x230\n do_syscall_64+0x84/0x2f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0010:new_curseg+0x70f/0x720\n\nThe root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may\ntrigger foreground gc only if it allocates any physical block, it will be\na little bit later when there is multiple threads writing data w/\naio/dio/bufio method in parallel, since we always use OPU in lfs mode, so\nf2fs_map_blocks() does block allocations aggressively.\n\nIn order to fix this issue, let's give a chance to trigger foreground\ngc in prior to block allocation in f2fs_map_blocks().","Type":"Description","Title":"f2fs: fix to trigger foreground gc during f2fs_map_blocks() in l"}]}}}