CVE-2025-21907 (GCVE-0-2025-21907)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2026-05-23 15:57
VLAI
Title
mm: memory-failure: update ttu flag inside unmap_poisoned_folio
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: memory-failure: update ttu flag inside unmap_poisoned_folio Patch series "mm: memory_failure: unmap poisoned folio during migrate properly", v3. Fix two bugs during folio migration if the folio is poisoned. This patch (of 3): Commit 6da6b1d4a7df ("mm/hwpoison: convert TTU_IGNORE_HWPOISON to TTU_HWPOISON") introduce TTU_HWPOISON to replace TTU_IGNORE_HWPOISON in order to stop send SIGBUS signal when accessing an error page after a memory error on a clean folio. However during page migration, anon folio must be set with TTU_HWPOISON during unmap_*(). For pagecache we need some policy just like the one in hwpoison_user_mappings to set this flag. So move this policy from hwpoison_user_mappings to unmap_poisoned_folio to handle this warning properly. Warning will be produced during unamp poison folio with the following log: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 365 at mm/rmap.c:1847 try_to_unmap_one+0x8fc/0xd3c Modules linked in: CPU: 1 UID: 0 PID: 365 Comm: bash Tainted: G W 6.13.0-rc1-00018-gacdb4bbda7ab #42 Tainted: [W]=WARN Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : try_to_unmap_one+0x8fc/0xd3c lr : try_to_unmap_one+0x3dc/0xd3c Call trace: try_to_unmap_one+0x8fc/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 ---[ end trace 0000000000000000 ]--- [mawupeng1@huawei.com: unmap_poisoned_folio(): remove shadowed local `mapping', per Miaohe]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6da6b1d4a7df8c35770186b53ef65d388398e139 , < 608cc7deb428f1122ed426060233622ebf667b6e (git)
Affected: 6da6b1d4a7df8c35770186b53ef65d388398e139 , < 425c12c076e6fc6b2cb04b9f960319d31dcabc76 (git)
Affected: 6da6b1d4a7df8c35770186b53ef65d388398e139 , < b81679b1633aa43c0d973adfa816d78c1ed0d032 (git)
Affected: deab8114fb67dcb0e6293b665c3c7083fbadff17 (git)
Affected: 6dcf132fe236045bd7f50c008660ea086d09af1f (git)
Affected: 6.1.16 , < 6.2 (semver)
Affected: 6.2.3 , < 6.3 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: fallo de memoria: actualizaci\u00f3n del indicador ttu dentro de unmap_poisoned_folio. Serie de parches \"mm: fallo de memoria: desasignar correctamente un folio envenenado durante la migraci\u00f3n\", v3. Se corrigen dos errores durante la migraci\u00f3n de folios si este est\u00e1 envenenado. Este parche (de 3): El commit 6da6b1d4a7df (\"mm/hwpoison: convertir TTU_IGNORE_HWPOISON en TTU_HWPOISON\") introduce TTU_HWPOISON en lugar de TTU_IGNORE_HWPOISON para detener el env\u00edo de la se\u00f1al SIGBUS al acceder a una p\u00e1gina con error tras un error de memoria en un folio limpio. Sin embargo, durante la migraci\u00f3n de p\u00e1ginas, anon folio debe configurarse con TTU_HWPOISON durante unmap_*(). Para la cach\u00e9 de p\u00e1ginas, necesitamos una pol\u00edtica similar a la de hwpoison_user_mappings para configurar este indicador. Por lo tanto, mueva esta pol\u00edtica de hwpoison_user_mappings a unmap_poisoned_folio para gestionar esta advertencia correctamente. Se producir\u00e1 una advertencia durante el envenenamiento de folio de unamp con el siguiente registro: ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 1 PID: 365 en mm/rmap.c:1847 try_to_unmap_one+0x8fc/0xd3c M\u00f3dulos vinculados: CPU: 1 UID: 0 PID: 365 Comm: bash Contaminado: GW 6.13.0-rc1-00018-gacdb4bbda7ab #42 Contaminado: [W]=WARN Nombre del hardware: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : try_to_unmap_one+0x8fc/0xd3c lr : try_to_unmap_one+0x3dc/0xd3c Rastreo de llamadas:  try_to_unmap_one+0x8fc/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 ---[fin de seguimiento 0000000000000000 ]--- [mawupeng1@huawei.com: unmap_poisoned_folio(): eliminar el \u0027mapeo\u0027 local sombreado, seg\u00fan Miaohe] Enlace: https://lkml.kernel.org/r/20250219060653.3849083-1-mawupeng1@huawei.com"
          }
        ],
        "id": "CVE-2025-21907",
        "lastModified": "2026-06-17T08:44:34.863",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-04-01T16:15:21.217",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/425c12c076e6fc6b2cb04b9f960319d31dcabc76"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/608cc7deb428f1122ed426060233622ebf667b6e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b81679b1633aa43c0d973adfa816d78c1ed0d032"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:36:32+00:00",
      "cve": "CVE-2025-21907",
      "id": "CVE-2025-21907",
      "initial_release_date": "2025-04-01T00:00:00+00:00",
      "product_status:known_affected": "226",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm: memory-failure: update ttu flag inside unmap_poisoned_folio",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21907.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:04:19Z",
      "cve": "CVE-2025-21907",
      "id": "CVE-2025-21907",
      "initial_release_date": "2025-04-02T13:29:21Z",
      "product_status:known_not_affected": "384",
      "product_status:recommended": "78",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21907",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21907.json",
      "version": "28"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.