{ "cveId": "CVE-2025-21907", "url": "https://patchblox.com/security/cve/CVE-2025-21907", "summary": "CVE-2025-21907 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21907, released April 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.", "title": "mm: memory-failure: update ttu flag inside unmap_poisoned_folio", "description": "In the Linux kernel, the following vulnerability has been resolved: mm: memory-failure: update ttu flag inside unmap_poisoned_folio Patch series \u0022mm: memory_failure: unmap poisoned folio during migrate properly\u0022, v3. Fix two bugs during folio migration if the folio is poisoned. This patch (of 3): Commit 6da6b1d4a7df (\u0022mm/hwpoison: convert TTU_IGNORE_HWPOISON to TTU_HWPOISON\u0022) introduce TTU_HWPOISON to replace TTU_IGNORE_HWPOISON in order to stop send SIGBUS signal when accessing an error page after a memory error on a clean folio. However during page migration, anon folio must be set with TTU_HWPOISON during unmap_*(). For pagecache we need some policy just like the one in hwpoison_user_mappings to set this flag. So move this policy from hwpoison_user_mappings to unmap_poisoned_folio to handle this warning properly. Warning will be produced during unamp poison folio with the following log: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 365 at mm/rmap.c:1847 try_to_unmap_one\u002B0x8fc/0xd3c Modules linked in: CPU: 1 UID: 0 PID: 365 Comm: bash Tainted: G W 6.13.0-rc1-00018-gacdb4bbda7ab #42 Tainted: [W]=WARN Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 20400005 (nzCv daif \u002BPAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : try_to_unmap_one\u002B0x8fc/0xd3c lr : try_to_unmap_one\u002B0x3dc/0xd3c Call trace: try_to_unmap_one\u002B0x8fc/0xd3c (P) try_to_unmap_one\u002B0x3dc/0xd3c (L) rmap_walk_anon\u002B0xdc/0x1f8 rmap_walk\u002B0x3c/0x58 try_to_unmap\u002B0x88/0x90 unmap_poisoned_folio\u002B0x30/0xa8 do_migrate_range\u002B0x4a0/0x568 offline_pages\u002B0x5a4/0x670 memory_block_action\u002B0x17c/0x374 memory_subsys_offline\u002B0x3c/0x78 device_offline\u002B0xa4/0xd0 state_store\u002B0x8c/0xf0 dev_attr_store\u002B0x18/0x2c sysfs_kf_write\u002B0x44/0x54 kernfs_fop_write_iter\u002B0x118/0x1a8 vfs_write\u002B0x3a8/0x4bc ksys_write\u002B0x6c/0xf8 __arm64_sys_write\u002B0x1c/0x28 invoke_syscall\u002B0x44/0x100 el0_svc_common.constprop.0\u002B0x40/0xe0 do_el0_svc\u002B0x1c/0x28 el0_svc\u002B0x30/0xd0 el0t_64_sync_handler\u002B0xc8/0xcc el0t_64_sync\u002B0x198/0x19c ---[ end trace 0000000000000000 ]--- [mawupeng1@huawei.com: unmap_poisoned_folio(): remove shadowed local \u0060mapping\u0027, per Miaohe]", "published": "2025-04-01T16:15:21Z", "severity": "Moderate", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00203, "epssPercentile": 0.10362, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21907", "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": 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"fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-tools", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek64k", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek64k", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek64k-core", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", 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