{ "cveId": "CVE-2025-21634", "url": "https://patchblox.com/security/cve/CVE-2025-21634", "summary": "CVE-2025-21634 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21634, released January 19, 2025. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: remove kernfs active break A war...", "description": "In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: remove kernfs active break A warning was found: WARNING: CPU: 10 PID: 3486953 at fs/kernfs/file.c:828 CPU: 10 PID: 3486953 Comm: rmdir Kdump: loaded Tainted: G RIP: 0010:kernfs_should_drain_open_files\u002B0x1a1/0x1b0 RSP: 0018:ffff8881107ef9e0 EFLAGS: 00010202 RAX: 0000000080000002 RBX: ffff888154738c00 RCX: dffffc0000000000 RDX: 0000000000000007 RSI: 0000000000000004 RDI: ffff888154738c04 RBP: ffff888154738c04 R08: ffffffffaf27fa15 R09: ffffed102a8e7180 R10: ffff888154738c07 R11: 0000000000000000 R12: ffff888154738c08 R13: ffff888750f8c000 R14: ffff888750f8c0e8 R15: ffff888154738ca0 FS: 00007f84cd0be740(0000) GS:ffff8887ddc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555f9fbe00c8 CR3: 0000000153eec001 CR4: 0000000000370ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kernfs_drain\u002B0x15e/0x2f0 __kernfs_remove\u002B0x165/0x300 kernfs_remove_by_name_ns\u002B0x7b/0xc0 cgroup_rm_file\u002B0x154/0x1c0 cgroup_addrm_files\u002B0x1c2/0x1f0 css_clear_dir\u002B0x77/0x110 kill_css\u002B0x4c/0x1b0 cgroup_destroy_locked\u002B0x194/0x380 cgroup_rmdir\u002B0x2a/0x140 It can be explained by: rmdir \t\t\t\techo 1 \u003E cpuset.cpus \t\t\t\tkernfs_fop_write_iter // active=0 cgroup_rm_file kernfs_remove_by_name_ns\tkernfs_get_active // active=1 __kernfs_remove\t\t\t\t\t // active=0x80000002 kernfs_drain\t\t\tcpuset_write_resmask wait_event //waiting (active == 0x80000001) \t\t\t\tkernfs_break_active_protection \t\t\t\t// active = 0x80000001 // continue \t\t\t\tkernfs_unbreak_active_protection \t\t\t\t// active = 0x80000002 ... kernfs_should_drain_open_files // warning occurs \t\t\t\tkernfs_put_active This warning is caused by \u0027kernfs_break_active_protection\u0027 when it is writing to cpuset.cpus, and the cgroup is removed concurrently. The commit 3a5a6d0c2b03 (\u0022cpuset: don\u0027t nest cgroup_mutex inside get_online_cpus()\u0022) made cpuset_hotplug_workfn asynchronous, This change involves calling flush_work(), which can create a multiple processes circular locking dependency that involve cgroup_mutex, potentially leading to a deadlock. To avoid deadlock. the commit 76bb5ab8f6e3 (\u0022cpuset: break kernfs active protection in cpuset_write_resmask()\u0022) added \u0027kernfs_break_active_protection\u0027 in the cpuset_write_resmask. This could lead to this warning. After the commit 2125c0034c5d (\u0022cgroup/cpuset: Make cpuset hotplug processing synchronous\u0022), the cpuset_write_resmask no longer needs to wait the hotplug to finish, which means that concurrent hotplug and cpuset operations are no longer possible. Therefore, the deadlock doesn\u0027t exist anymore and it does not have to \u0027break active protection\u0027 now. To fix this warning, just remove kernfs_break_active_protection operation in the \u0027cpuset_write_resmask\u0027.", "published": "2025-01-19T11:15:08Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00141, "epssPercentile": 0.03434, "priority": "Routine", "priorityTier": 4, "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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