{"api_version":"1","generated_at":"2026-11-06T07:23:51+00:00","cve":"CVE-2025-21907","urls":{"html":"https://cve.report/CVE-2025-21907","api":"https://cve.report/api/cve/CVE-2025-21907.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-21907","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-21907"},"summary":{"title":"mm: memory-failure: update ttu flag inside unmap_poisoned_folio","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: memory-failure: update ttu flag inside unmap_poisoned_folio\n\nPatch series \"mm: memory_failure: unmap poisoned folio during migrate\nproperly\", v3.\n\nFix two bugs during folio migration if the folio is poisoned.\n\n\nThis patch (of 3):\n\nCommit 6da6b1d4a7df (\"mm/hwpoison: convert TTU_IGNORE_HWPOISON to\nTTU_HWPOISON\") introduce TTU_HWPOISON to replace TTU_IGNORE_HWPOISON in\norder to stop send SIGBUS signal when accessing an error page after a\nmemory error on a clean folio.  However during page migration, anon folio\nmust be set with TTU_HWPOISON during unmap_*().  For pagecache we need\nsome policy just like the one in hwpoison_user_mappings to set this flag. \nSo move this policy from hwpoison_user_mappings to unmap_poisoned_folio to\nhandle this warning properly.\n\nWarning will be produced during unamp poison folio with the following log:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 1 PID: 365 at mm/rmap.c:1847 try_to_unmap_one+0x8fc/0xd3c\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 365 Comm: bash Tainted: G        W          6.13.0-rc1-00018-gacdb4bbda7ab #42\n  Tainted: [W]=WARN\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : try_to_unmap_one+0x8fc/0xd3c\n  lr : try_to_unmap_one+0x3dc/0xd3c\n  Call trace:\n   try_to_unmap_one+0x8fc/0xd3c (P)\n   try_to_unmap_one+0x3dc/0xd3c (L)\n   rmap_walk_anon+0xdc/0x1f8\n   rmap_walk+0x3c/0x58\n   try_to_unmap+0x88/0x90\n   unmap_poisoned_folio+0x30/0xa8\n   do_migrate_range+0x4a0/0x568\n   offline_pages+0x5a4/0x670\n   memory_block_action+0x17c/0x374\n   memory_subsys_offline+0x3c/0x78\n   device_offline+0xa4/0xd0\n   state_store+0x8c/0xf0\n   dev_attr_store+0x18/0x2c\n   sysfs_kf_write+0x44/0x54\n   kernfs_fop_write_iter+0x118/0x1a8\n   vfs_write+0x3a8/0x4bc\n   ksys_write+0x6c/0xf8\n   __arm64_sys_write+0x1c/0x28\n   invoke_syscall+0x44/0x100\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x30/0xd0\n   el0t_64_sync_handler+0xc8/0xcc\n   el0t_64_sync+0x198/0x19c\n  ---[ end trace 0000000000000000 ]---\n\n[mawupeng1@huawei.com: unmap_poisoned_folio(): remove shadowed local `mapping', per Miaohe]","state":"PUBLISHED","assigner":"Linux","published_at":"2025-04-01 16:15:21","updated_at":"2026-11-05 21:17:45"},"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/b81679b1633aa43c0d973adfa816d78c1ed0d032","name":"https://git.kernel.org/stable/c/b81679b1633aa43c0d973adfa816d78c1ed0d032","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/608cc7deb428f1122ed426060233622ebf667b6e","name":"https://git.kernel.org/stable/c/608cc7deb428f1122ed426060233622ebf667b6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/425c12c076e6fc6b2cb04b9f960319d31dcabc76","name":"https://git.kernel.org/stable/c/425c12c076e6fc6b2cb04b9f960319d31dcabc76","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-21907","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21907","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6da6b1d4a7df8c35770186b53ef65d388398e139 608cc7deb428f1122ed426060233622ebf667b6e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6da6b1d4a7df8c35770186b53ef65d388398e139 425c12c076e6fc6b2cb04b9f960319d31dcabc76 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6da6b1d4a7df8c35770186b53ef65d388398e139 b81679b1633aa43c0d973adfa816d78c1ed0d032 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected deab8114fb67dcb0e6293b665c3c7083fbadff17 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6dcf132fe236045bd7f50c008660ea086d09af1f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.16 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2.3 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.19 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13.7 6.13.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.14 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2025","cve_id":"21907","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":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2025-21907","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-11-05T20:36:33.206497Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-11-05T20:41:47.231Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/internal.h","mm/memory-failure.c","mm/memory_hotplug.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"608cc7deb428f1122ed426060233622ebf667b6e","status":"affected","version":"6da6b1d4a7df8c35770186b53ef65d388398e139","versionType":"git"},{"lessThan":"425c12c076e6fc6b2cb04b9f960319d31dcabc76","status":"affected","version":"6da6b1d4a7df8c35770186b53ef65d388398e139","versionType":"git"},{"lessThan":"b81679b1633aa43c0d973adfa816d78c1ed0d032","status":"affected","version":"6da6b1d4a7df8c35770186b53ef65d388398e139","versionType":"git"},{"status":"affected","version":"deab8114fb67dcb0e6293b665c3c7083fbadff17","versionType":"git"},{"status":"affected","version":"6dcf132fe236045bd7f50c008660ea086d09af1f","versionType":"git"},{"lessThan":"6.2","status":"affected","version":"6.1.16","versionType":"semver"},{"lessThan":"6.3","status":"affected","version":"6.2.3","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["mm/internal.h","mm/memory-failure.c","mm/memory_hotplug.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.19","versionType":"semver"},{"lessThanOrEqual":"6.13.*","status":"unaffected","version":"6.13.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.14","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.19","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.13.7","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.14","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: memory-failure: update ttu flag inside unmap_poisoned_folio\n\nPatch series \"mm: memory_failure: unmap poisoned folio during migrate\nproperly\", v3.\n\nFix two bugs during folio migration if the folio is poisoned.\n\n\nThis patch (of 3):\n\nCommit 6da6b1d4a7df (\"mm/hwpoison: convert TTU_IGNORE_HWPOISON to\nTTU_HWPOISON\") introduce TTU_HWPOISON to replace TTU_IGNORE_HWPOISON in\norder to stop send SIGBUS signal when accessing an error page after a\nmemory error on a clean folio.  However during page migration, anon folio\nmust be set with TTU_HWPOISON during unmap_*().  For pagecache we need\nsome policy just like the one in hwpoison_user_mappings to set this flag. \nSo move this policy from hwpoison_user_mappings to unmap_poisoned_folio to\nhandle this warning properly.\n\nWarning will be produced during unamp poison folio with the following log:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 1 PID: 365 at mm/rmap.c:1847 try_to_unmap_one+0x8fc/0xd3c\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 365 Comm: bash Tainted: G        W          6.13.0-rc1-00018-gacdb4bbda7ab #42\n  Tainted: [W]=WARN\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : try_to_unmap_one+0x8fc/0xd3c\n  lr : try_to_unmap_one+0x3dc/0xd3c\n  Call trace:\n   try_to_unmap_one+0x8fc/0xd3c (P)\n   try_to_unmap_one+0x3dc/0xd3c (L)\n   rmap_walk_anon+0xdc/0x1f8\n   rmap_walk+0x3c/0x58\n   try_to_unmap+0x88/0x90\n   unmap_poisoned_folio+0x30/0xa8\n   do_migrate_range+0x4a0/0x568\n   offline_pages+0x5a4/0x670\n   memory_block_action+0x17c/0x374\n   memory_subsys_offline+0x3c/0x78\n   device_offline+0xa4/0xd0\n   state_store+0x8c/0xf0\n   dev_attr_store+0x18/0x2c\n   sysfs_kf_write+0x44/0x54\n   kernfs_fop_write_iter+0x118/0x1a8\n   vfs_write+0x3a8/0x4bc\n   ksys_write+0x6c/0xf8\n   __arm64_sys_write+0x1c/0x28\n   invoke_syscall+0x44/0x100\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x30/0xd0\n   el0t_64_sync_handler+0xc8/0xcc\n   el0t_64_sync+0x198/0x19c\n  ---[ end trace 0000000000000000 ]---\n\n[mawupeng1@huawei.com: unmap_poisoned_folio(): remove shadowed local `mapping', per Miaohe]"}],"providerMetadata":{"dateUpdated":"2026-05-23T15:57:25.876Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/608cc7deb428f1122ed426060233622ebf667b6e"},{"url":"https://git.kernel.org/stable/c/425c12c076e6fc6b2cb04b9f960319d31dcabc76"},{"url":"https://git.kernel.org/stable/c/b81679b1633aa43c0d973adfa816d78c1ed0d032"}],"title":"mm: memory-failure: update ttu flag inside unmap_poisoned_folio","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-21907","datePublished":"2025-04-01T15:40:47.576Z","dateReserved":"2024-12-29T08:45:45.786Z","dateUpdated":"2026-11-05T20:41:47.231Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-04-01 16:15:21","lastModifiedDate":"2026-11-05 21:17:45","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}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-11-05T20:36:33.206497Z","id":"CVE-2025-21907","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.16","versionEndExcluding":"6.2","matchCriteriaId":"E0F792B8-000E-4D97-B7F7-B3660397A964"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2.3","versionEndExcluding":"6.12.19","matchCriteriaId":"EB5FAD40-FE0F-4A65-BFB5-0690AD42A7DD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.13.7","matchCriteriaId":"842F5A44-3E71-4546-B4FD-43B0ACE3F32B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*","matchCriteriaId":"186716B6-2B66-4BD0-852E-D48E71C0C85F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*","matchCriteriaId":"0D3E781C-403A-498F-9DA9-ECEE50F41E75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*","matchCriteriaId":"66619FB8-0AAF-4166-B2CF-67B24143261D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*","matchCriteriaId":"D3D6550E-6679-4560-902D-AF52DCFE905B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*","matchCriteriaId":"45B90F6B-BEC7-4D4E-883A-9DBADE021750"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"21907","Ordinal":"1","Title":"mm: memory-failure: update ttu flag inside unmap_poisoned_folio","CVE":"CVE-2025-21907","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"21907","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: memory-failure: update ttu flag inside unmap_poisoned_folio\n\nPatch series \"mm: memory_failure: unmap poisoned folio during migrate\nproperly\", v3.\n\nFix two bugs during folio migration if the folio is poisoned.\n\n\nThis patch (of 3):\n\nCommit 6da6b1d4a7df (\"mm/hwpoison: convert TTU_IGNORE_HWPOISON to\nTTU_HWPOISON\") introduce TTU_HWPOISON to replace TTU_IGNORE_HWPOISON in\norder to stop send SIGBUS signal when accessing an error page after a\nmemory error on a clean folio.  However during page migration, anon folio\nmust be set with TTU_HWPOISON during unmap_*().  For pagecache we need\nsome policy just like the one in hwpoison_user_mappings to set this flag. \nSo move this policy from hwpoison_user_mappings to unmap_poisoned_folio to\nhandle this warning properly.\n\nWarning will be produced during unamp poison folio with the following log:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 1 PID: 365 at mm/rmap.c:1847 try_to_unmap_one+0x8fc/0xd3c\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 365 Comm: bash Tainted: G        W          6.13.0-rc1-00018-gacdb4bbda7ab #42\n  Tainted: [W]=WARN\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : try_to_unmap_one+0x8fc/0xd3c\n  lr : try_to_unmap_one+0x3dc/0xd3c\n  Call trace:\n   try_to_unmap_one+0x8fc/0xd3c (P)\n   try_to_unmap_one+0x3dc/0xd3c (L)\n   rmap_walk_anon+0xdc/0x1f8\n   rmap_walk+0x3c/0x58\n   try_to_unmap+0x88/0x90\n   unmap_poisoned_folio+0x30/0xa8\n   do_migrate_range+0x4a0/0x568\n   offline_pages+0x5a4/0x670\n   memory_block_action+0x17c/0x374\n   memory_subsys_offline+0x3c/0x78\n   device_offline+0xa4/0xd0\n   state_store+0x8c/0xf0\n   dev_attr_store+0x18/0x2c\n   sysfs_kf_write+0x44/0x54\n   kernfs_fop_write_iter+0x118/0x1a8\n   vfs_write+0x3a8/0x4bc\n   ksys_write+0x6c/0xf8\n   __arm64_sys_write+0x1c/0x28\n   invoke_syscall+0x44/0x100\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x30/0xd0\n   el0t_64_sync_handler+0xc8/0xcc\n   el0t_64_sync+0x198/0x19c\n  ---[ end trace 0000000000000000 ]---\n\n[mawupeng1@huawei.com: unmap_poisoned_folio(): remove shadowed local `mapping', per Miaohe]","Type":"Description","Title":"mm: memory-failure: update ttu flag inside unmap_poisoned_folio"}]}}}