CVE-2025-21931

MEDIUM EPSS 3.3%
Published Apr 1, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 1, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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 ]---

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥3.16.65  –  <3.17
linuxlinux_kernel*≥4.4.170  –  <4.5
linuxlinux_kernel*≥4.9.150  –  <4.10
linuxlinux_kernel*≥4.14.93  –  <4.15
linuxlinux_kernel*≥4.19.15  –  <4.20
linuxlinux_kernel*≥4.20.2  –  <6.1.140
linuxlinux_kernel*≥6.2  –  <6.6.92
linuxlinux_kernel*≥6.7  –  <6.12.19
linuxlinux_kernel*≥6.13  –  <6.13.7
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/3926b572fd073491bde13ec42ee08ac1b337bf4d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/576a2f4c437c19bec7d05d05b5990f178d2b0f40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/629dfc6ba5431056701d4e44830f3409b989955a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93df6da64b004f75d307ed08d3f0f1020280d339
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/af288a426c3e3552b62595c6138ec6371a17dbba
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3926b572fd073491bde13ec42ee08ac1b337bf4d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/576a2f4c437c19bec7d05d05b5990f178d2b0f40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/629dfc6ba5431056701d4e44830f3409b989955a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93df6da64b004f75d307ed08d3f0f1020280d339
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/af288a426c3e3552b62595c6138ec6371a17dbba
    Patch