CVE-2025-21931 (GCVE-0-2025-21931)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:41 – Updated: 2025-11-03 19:39
VLAI?
Title
hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio
Summary
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 ]---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b15c87263a69272423771118c653e9a1d0672caa , < 3926b572fd073491bde13ec42ee08ac1b337bf4d (git)
Affected: b15c87263a69272423771118c653e9a1d0672caa , < 93df6da64b004f75d307ed08d3f0f1020280d339 (git)
Affected: b15c87263a69272423771118c653e9a1d0672caa , < 576a2f4c437c19bec7d05d05b5990f178d2b0f40 (git)
Affected: b15c87263a69272423771118c653e9a1d0672caa , < 629dfc6ba5431056701d4e44830f3409b989955a (git)
Affected: b15c87263a69272423771118c653e9a1d0672caa , < af288a426c3e3552b62595c6138ec6371a17dbba (git)
Affected: 85ef35ab972b7484f41c3bb2bbc79de212e19129 (git)
Affected: 060853fdd434ce620dd1dd7619ede834bd33b9d0 (git)
Affected: cb1206e85df291fefde27401190329e26996c54c (git)
Affected: 2c25071bed4b1f9c4cfb10a7914847d7069794bf (git)
Affected: 2c87072a3bf9bbcd747618bb2ccc3cd0da181db6 (git)
Affected: a2b977e3d9e4298d28ebe5cfff9e0859b74a7ac7 (git)
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    Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.1.140 , ≤ 6.1.* (semver)
Unaffected: 6.6.92 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio\n\nCommit b15c87263a69 (\"hwpoison, memory_hotplug: allow hwpoisoned pages to\nbe offlined) add page poison checks in do_migrate_range in order to make\noffline hwpoisoned page possible by introducing isolate_lru_page and\ntry_to_unmap for hwpoisoned page.  However folio lock must be held before\ncalling try_to_unmap.  Add it to fix this problem.\n\nWarning will be produced if folio is not locked during unmap:\n\n  ------------[ cut here ]------------\n  kernel BUG at ./include/linux/swapops.h:400!\n  Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n  Modules linked in:\n  CPU: 4 UID: 0 PID: 411 Comm: bash Tainted: G        W          6.13.0-rc1-00016-g3c434c7ee82a-dirty #41\n  Tainted: [W]=WARN\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : try_to_unmap_one+0xb08/0xd3c\n  lr : try_to_unmap_one+0x3dc/0xd3c\n  Call trace:\n   try_to_unmap_one+0xb08/0xd3c (P)\n   try_to_unmap_one+0x3dc/0xd3c (L)\n   rmap_walk_anon+0xdc/0x1f8\n   rmap_walk+0x3c/0x58\n   try_to_unmap+0x88/0x90\n   unmap_poisoned_folio+0x30/0xa8\n   do_migrate_range+0x4a0/0x568\n   offline_pages+0x5a4/0x670\n   memory_block_action+0x17c/0x374\n   memory_subsys_offline+0x3c/0x78\n   device_offline+0xa4/0xd0\n   state_store+0x8c/0xf0\n   dev_attr_store+0x18/0x2c\n   sysfs_kf_write+0x44/0x54\n   kernfs_fop_write_iter+0x118/0x1a8\n   vfs_write+0x3a8/0x4bc\n   ksys_write+0x6c/0xf8\n   __arm64_sys_write+0x1c/0x28\n   invoke_syscall+0x44/0x100\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x30/0xd0\n   el0t_64_sync_handler+0xc8/0xcc\n   el0t_64_sync+0x198/0x19c\n  Code: f9407be0 b5fff320 d4210000 17ffff97 (d4210000)\n  ---[ end trace 0000000000000000 ]---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-22T12:40:06.391Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3926b572fd073491bde13ec42ee08ac1b337bf4d"
        },
        {
          "url": "https://git.kernel.org/stable/c/93df6da64b004f75d307ed08d3f0f1020280d339"
        },
        {
          "url": "https://git.kernel.org/stable/c/576a2f4c437c19bec7d05d05b5990f178d2b0f40"
        },
        {
          "url": "https://git.kernel.org/stable/c/629dfc6ba5431056701d4e44830f3409b989955a"
        },
        {
          "url": "https://git.kernel.org/stable/c/af288a426c3e3552b62595c6138ec6371a17dbba"
        }
      ],
      "title": "hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21931",
    "datePublished": "2025-04-01T15:41:01.055Z",
    "dateReserved": "2024-12-29T08:45:45.789Z",
    "dateUpdated": "2025-11-03T19:39:27.919Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.