{ "cveId": "CVE-2025-21722", "url": "https://patchblox.com/security/cve/CVE-2025-21722", "summary": "CVE-2025-21722 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21722, released February 27, 2025. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: nilfs2: do not force clear folio if buffer is re...", "description": "In the Linux kernel, the following vulnerability has been resolved: nilfs2: do not force clear folio if buffer is referenced Patch series \u0022nilfs2: protect busy buffer heads from being force-cleared\u0022. This series fixes the buffer head state inconsistency issues reported by syzbot that occurs when the filesystem is corrupted and falls back to read-only, and the associated buffer head use-after-free issue. This patch (of 2): Syzbot has reported that after nilfs2 detects filesystem corruption and falls back to read-only, inconsistencies in the buffer state may occur. One of the inconsistencies is that when nilfs2 calls mark_buffer_dirty() to set a data or metadata buffer as dirty, but it detects that the buffer is not in the uptodate state: WARNING: CPU: 0 PID: 6049 at fs/buffer.c:1177 mark_buffer_dirty\u002B0x2e5/0x520 fs/buffer.c:1177 ... Call Trace: \u003CTASK\u003E nilfs_palloc_commit_alloc_entry\u002B0x4b/0x160 fs/nilfs2/alloc.c:598 nilfs_ifile_create_inode\u002B0x1dd/0x3a0 fs/nilfs2/ifile.c:73 nilfs_new_inode\u002B0x254/0x830 fs/nilfs2/inode.c:344 nilfs_mkdir\u002B0x10d/0x340 fs/nilfs2/namei.c:218 vfs_mkdir\u002B0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat\u002B0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat\u002B0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64\u002B0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f The other is when nilfs_btree_propagate(), which propagates the dirty state to the ancestor nodes of a b-tree that point to a dirty buffer, detects that the origin buffer is not dirty, even though it should be: WARNING: CPU: 0 PID: 5245 at fs/nilfs2/btree.c:2089 nilfs_btree_propagate\u002B0xc79/0xdf0 fs/nilfs2/btree.c:2089 ... Call Trace: \u003CTASK\u003E nilfs_bmap_propagate\u002B0x75/0x120 fs/nilfs2/bmap.c:345 nilfs_collect_file_data\u002B0x4d/0xd0 fs/nilfs2/segment.c:587 nilfs_segctor_apply_buffers\u002B0x184/0x340 fs/nilfs2/segment.c:1006 nilfs_segctor_scan_file\u002B0x28c/0xa50 fs/nilfs2/segment.c:1045 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1216 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1540 [inline] nilfs_segctor_do_construct\u002B0x1c28/0x6b90 fs/nilfs2/segment.c:2115 nilfs_segctor_construct\u002B0x181/0x6b0 fs/nilfs2/segment.c:2479 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2587 [inline] nilfs_segctor_thread\u002B0x69e/0xe80 fs/nilfs2/segment.c:2701 kthread\u002B0x2f0/0x390 kernel/kthread.c:389 ret_from_fork\u002B0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm\u002B0x1a/0x30 arch/x86/entry/entry_64.S:244 \u003C/TASK\u003E Both of these issues are caused by the callbacks that handle the page/folio write requests, forcibly clear various states, including the working state of the buffers they hold, at unexpected times when they detect read-only fallback. Fix these issues by checking if the buffer is referenced before clearing the page/folio state, and skipping the clear if it is.", "published": "2025-02-27T02:15:15Z", "severity": "high", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00272, "epssPercentile": 0.19665, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "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": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug", "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-core", "release": "ol 10", 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