CVE-2025-21931

hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio

State: Published
Severity: Not scored
Published: Apr 1, 2025
Updated: May 23, 2026
Reserved: Dec 29, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio

Commit b15c87263a69 ("hwpoison, memory_hotplug: allow hwpoisoned pages to be offlined) add page poison checks in do_migrate_range in order to make offline hwpoisoned page possible by introducing isolate_lru_page and try_to_unmap for hwpoisoned page. However folio lock must be held before calling try_to_unmap. Add it to fix this problem.

Warning will be produced if folio is not locked during unmap:

------------[ cut here ]------------ kernel BUG at ./include/linux/swapops.h:400! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 4 UID: 0 PID: 411 Comm: bash Tainted: G W 6.13.0-rc1-00016-g3c434c7ee82a-dirty #41 Tainted: [W]=WARN Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : try_to_unmap_one+0xb08/0xd3c lr : try_to_unmap_one+0x3dc/0xd3c Call trace: try_to_unmap_one+0xb08/0xd3c (P) try_to_unmap_one+0x3dc/0xd3c (L) rmap_walk_anon+0xdc/0x1f8 rmap_walk+0x3c/0x58 try_to_unmap+0x88/0x90 unmap_poisoned_folio+0x30/0xa8 do_migrate_range+0x4a0/0x568 offline_pages+0x5a4/0x670 memory_block_action+0x17c/0x374 memory_subsys_offline+0x3c/0x78 device_offline+0xa4/0xd0 state_store+0x8c/0xf0 dev_attr_store+0x18/0x2c sysfs_kf_write+0x44/0x54 kernfs_fop_write_iter+0x118/0x1a8 vfs_write+0x3a8/0x4bc ksys_write+0x6c/0xf8 __arm64_sys_write+0x1c/0x28 invoke_syscall+0x44/0x100 el0_svc_common.constprop.0+0x40/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x30/0xd0 el0t_64_sync_handler+0xc8/0xcc el0t_64_sync+0x198/0x19c Code: f9407be0 b5fff320 d4210000 17ffff97 (d4210000) ---[ end trace 0000000000000000 ]---

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b15c87263a69272423771118c653e9a1d0672caa to before 3926b572fd073491bde13ec42ee08ac1b337bf4dAffected b15c87263a69272423771118c653e9a1d0672caa to before 93df6da64b004f75d307ed08d3f0f1020280d339Affected b15c87263a69272423771118c653e9a1d0672caa to before 576a2f4c437c19bec7d05d05b5990f178d2b0f40Affected b15c87263a69272423771118c653e9a1d0672caa to before 629dfc6ba5431056701d4e44830f3409b989955aAffected b15c87263a69272423771118c653e9a1d0672caa to before af288a426c3e3552b62595c6138ec6371a17dbbaAffected 85ef35ab972b7484f41c3bb2bbc79de212e19129Affected 060853fdd434ce620dd1dd7619ede834bd33b9d0Affected cb1206e85df291fefde27401190329e26996c54cAffected 2c25071bed4b1f9c4cfb10a7914847d7069794bfAffected 2c87072a3bf9bbcd747618bb2ccc3cd0da181db6Affected a2b977e3d9e4298d28ebe5cfff9e0859b74a7ac7Affected 3.16.65 to before 3.17Affected 4.4.170 to before 4.5Affected 4.9.150 to before 4.10Affected 4.14.93 to before 4.15Affected 4.19.15 to before 4.20Affected 4.20.2 to before 4.21Affected
LinuxLinux	5.0Affected before 5.0Not affected 6.1.140 through 6.1.Not affected 6.6.92 through 6.6.Not affected 6.12.19 through 6.12.Not affected 6.13.7 through 6.13.Not affected 6.14 and laterNot affected

Product

Versions

LinuxLinux

b15c87263a69272423771118c653e9a1d0672caa to before 3926b572fd073491bde13ec42ee08ac1b337bf4dAffected
b15c87263a69272423771118c653e9a1d0672caa to before 93df6da64b004f75d307ed08d3f0f1020280d339Affected
b15c87263a69272423771118c653e9a1d0672caa to before 576a2f4c437c19bec7d05d05b5990f178d2b0f40Affected
b15c87263a69272423771118c653e9a1d0672caa to before 629dfc6ba5431056701d4e44830f3409b989955aAffected
b15c87263a69272423771118c653e9a1d0672caa to before af288a426c3e3552b62595c6138ec6371a17dbbaAffected
85ef35ab972b7484f41c3bb2bbc79de212e19129Affected
060853fdd434ce620dd1dd7619ede834bd33b9d0Affected
cb1206e85df291fefde27401190329e26996c54cAffected
2c25071bed4b1f9c4cfb10a7914847d7069794bfAffected
2c87072a3bf9bbcd747618bb2ccc3cd0da181db6Affected
a2b977e3d9e4298d28ebe5cfff9e0859b74a7ac7Affected
3.16.65 to before 3.17Affected
4.4.170 to before 4.5Affected
4.9.150 to before 4.10Affected
4.14.93 to before 4.15Affected
4.19.15 to before 4.20Affected
4.20.2 to before 4.21Affected

LinuxLinux

5.0Affected
before 5.0Not affected
6.1.140 through 6.1.*Not affected
6.6.92 through 6.6.*Not affected
6.12.19 through 6.12.*Not affected
6.13.7 through 6.13.*Not affected
6.14 and laterNot affected

References

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