CVE-2024-56673 (GCVE-0-2024-56673)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:06 – Updated: 2026-05-11 20:57
VLAI
Title
riscv: mm: Do not call pmd dtor on vmemmap page table teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: mm: Do not call pmd dtor on vmemmap page table teardown The vmemmap's, which is used for RV64 with SPARSEMEM_VMEMMAP, page tables are populated using pmd (page middle directory) hugetables. However, the pmd allocation is not using the generic mechanism used by the VMA code (e.g. pmd_alloc()), or the RISC-V specific create_pgd_mapping()/alloc_pmd_late(). Instead, the vmemmap page table code allocates a page, and calls vmemmap_set_pmd(). This results in that the pmd ctor is *not* called, nor would it make sense to do so. Now, when tearing down a vmemmap page table pmd, the cleanup code would unconditionally, and incorrectly call the pmd dtor, which results in a crash (best case). This issue was found when running the HMM selftests: | tools/testing/selftests/mm# ./test_hmm.sh smoke | ... # when unloading the test_hmm.ko module | page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10915b | flags: 0x1000000000000000(node=0|zone=1) | raw: 1000000000000000 0000000000000000 dead000000000122 0000000000000000 | raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 | page dumped because: VM_BUG_ON_PAGE(ptdesc->pmd_huge_pte) | ------------[ cut here ]------------ | kernel BUG at include/linux/mm.h:3080! | Kernel BUG [#1] | Modules linked in: test_hmm(-) sch_fq_codel fuse drm drm_panel_orientation_quirks backlight dm_mod | CPU: 1 UID: 0 PID: 514 Comm: modprobe Tainted: G W 6.12.0-00982-gf2a4f1682d07 #2 | Tainted: [W]=WARN | Hardware name: riscv-virtio qemu/qemu, BIOS 2024.10 10/01/2024 | epc : remove_pgd_mapping+0xbec/0x1070 | ra : remove_pgd_mapping+0xbec/0x1070 | epc : ffffffff80010a68 ra : ffffffff80010a68 sp : ff20000000a73940 | gp : ffffffff827b2d88 tp : ff6000008785da40 t0 : ffffffff80fbce04 | t1 : 0720072007200720 t2 : 706d756420656761 s0 : ff20000000a73a50 | s1 : ff6000008915cff8 a0 : 0000000000000039 a1 : 0000000000000008 | a2 : ff600003fff0de20 a3 : 0000000000000000 a4 : 0000000000000000 | a5 : 0000000000000000 a6 : c0000000ffffefff a7 : ffffffff824469b8 | s2 : ff1c0000022456c0 s3 : ff1ffffffdbfffff s4 : ff6000008915c000 | s5 : ff6000008915c000 s6 : ff6000008915c000 s7 : ff1ffffffdc00000 | s8 : 0000000000000001 s9 : ff1ffffffdc00000 s10: ffffffff819a31f0 | s11: ffffffffffffffff t3 : ffffffff8000c950 t4 : ff60000080244f00 | t5 : ff60000080244000 t6 : ff20000000a73708 | status: 0000000200000120 badaddr: ffffffff80010a68 cause: 0000000000000003 | [<ffffffff80010a68>] remove_pgd_mapping+0xbec/0x1070 | [<ffffffff80fd238e>] vmemmap_free+0x14/0x1e | [<ffffffff8032e698>] section_deactivate+0x220/0x452 | [<ffffffff8032ef7e>] sparse_remove_section+0x4a/0x58 | [<ffffffff802f8700>] __remove_pages+0x7e/0xba | [<ffffffff803760d8>] memunmap_pages+0x2bc/0x3fe | [<ffffffff02a3ca28>] dmirror_device_remove_chunks+0x2ea/0x518 [test_hmm] | [<ffffffff02a3e026>] hmm_dmirror_exit+0x3e/0x1018 [test_hmm] | [<ffffffff80102c14>] __riscv_sys_delete_module+0x15a/0x2a6 | [<ffffffff80fd020c>] do_trap_ecall_u+0x1f2/0x266 | [<ffffffff80fde0a2>] _new_vmalloc_restore_context_a0+0xc6/0xd2 | Code: bf51 7597 0184 8593 76a5 854a 4097 0029 80e7 2c00 (9002) 7597 | ---[ end trace 0000000000000000 ]--- | Kernel panic - not syncing: Fatal exception in interrupt Add a check to avoid calling the pmd dtor, if the calling context is vmemmap_free().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:59 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c75a74f4ba19c904c0ae1e011ae2568449409ae4 , < 344945806f2f7af68be98bac02836c867f223aa9 (git)
Affected: c75a74f4ba19c904c0ae1e011ae2568449409ae4 , < 21f1b85c8912262adf51707e63614a114425eb10 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.6 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Do not call pmd dtor on vmemmap page table teardown\n\nThe vmemmap\u0027s, which is used for RV64 with SPARSEMEM_VMEMMAP, page\ntables are populated using pmd (page middle directory) hugetables.\nHowever, the pmd allocation is not using the generic mechanism used by\nthe VMA code (e.g. pmd_alloc()), or the RISC-V specific\ncreate_pgd_mapping()/alloc_pmd_late(). Instead, the vmemmap page table\ncode allocates a page, and calls vmemmap_set_pmd(). This results in\nthat the pmd ctor is *not* called, nor would it make sense to do so.\n\nNow, when tearing down a vmemmap page table pmd, the cleanup code\nwould unconditionally, and incorrectly call the pmd dtor, which\nresults in a crash (best case).\n\nThis issue was found when running the HMM selftests:\n\n  | tools/testing/selftests/mm# ./test_hmm.sh smoke\n  | ... # when unloading the test_hmm.ko module\n  | page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10915b\n  | flags: 0x1000000000000000(node=0|zone=1)\n  | raw: 1000000000000000 0000000000000000 dead000000000122 0000000000000000\n  | raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000\n  | page dumped because: VM_BUG_ON_PAGE(ptdesc-\u003epmd_huge_pte)\n  | ------------[ cut here ]------------\n  | kernel BUG at include/linux/mm.h:3080!\n  | Kernel BUG [#1]\n  | Modules linked in: test_hmm(-) sch_fq_codel fuse drm drm_panel_orientation_quirks backlight dm_mod\n  | CPU: 1 UID: 0 PID: 514 Comm: modprobe Tainted: G        W          6.12.0-00982-gf2a4f1682d07 #2\n  | Tainted: [W]=WARN\n  | Hardware name: riscv-virtio qemu/qemu, BIOS 2024.10 10/01/2024\n  | epc : remove_pgd_mapping+0xbec/0x1070\n  |  ra : remove_pgd_mapping+0xbec/0x1070\n  | epc : ffffffff80010a68 ra : ffffffff80010a68 sp : ff20000000a73940\n  |  gp : ffffffff827b2d88 tp : ff6000008785da40 t0 : ffffffff80fbce04\n  |  t1 : 0720072007200720 t2 : 706d756420656761 s0 : ff20000000a73a50\n  |  s1 : ff6000008915cff8 a0 : 0000000000000039 a1 : 0000000000000008\n  |  a2 : ff600003fff0de20 a3 : 0000000000000000 a4 : 0000000000000000\n  |  a5 : 0000000000000000 a6 : c0000000ffffefff a7 : ffffffff824469b8\n  |  s2 : ff1c0000022456c0 s3 : ff1ffffffdbfffff s4 : ff6000008915c000\n  |  s5 : ff6000008915c000 s6 : ff6000008915c000 s7 : ff1ffffffdc00000\n  |  s8 : 0000000000000001 s9 : ff1ffffffdc00000 s10: ffffffff819a31f0\n  |  s11: ffffffffffffffff t3 : ffffffff8000c950 t4 : ff60000080244f00\n  |  t5 : ff60000080244000 t6 : ff20000000a73708\n  | status: 0000000200000120 badaddr: ffffffff80010a68 cause: 0000000000000003\n  | [\u003cffffffff80010a68\u003e] remove_pgd_mapping+0xbec/0x1070\n  | [\u003cffffffff80fd238e\u003e] vmemmap_free+0x14/0x1e\n  | [\u003cffffffff8032e698\u003e] section_deactivate+0x220/0x452\n  | [\u003cffffffff8032ef7e\u003e] sparse_remove_section+0x4a/0x58\n  | [\u003cffffffff802f8700\u003e] __remove_pages+0x7e/0xba\n  | [\u003cffffffff803760d8\u003e] memunmap_pages+0x2bc/0x3fe\n  | [\u003cffffffff02a3ca28\u003e] dmirror_device_remove_chunks+0x2ea/0x518 [test_hmm]\n  | [\u003cffffffff02a3e026\u003e] hmm_dmirror_exit+0x3e/0x1018 [test_hmm]\n  | [\u003cffffffff80102c14\u003e] __riscv_sys_delete_module+0x15a/0x2a6\n  | [\u003cffffffff80fd020c\u003e] do_trap_ecall_u+0x1f2/0x266\n  | [\u003cffffffff80fde0a2\u003e] _new_vmalloc_restore_context_a0+0xc6/0xd2\n  | Code: bf51 7597 0184 8593 76a5 854a 4097 0029 80e7 2c00 (9002) 7597\n  | ---[ end trace 0000000000000000 ]---\n  | Kernel panic - not syncing: Fatal exception in interrupt\n\nAdd a check to avoid calling the pmd dtor, if the calling context is\nvmemmap_free()."
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: mm: No llamar a pmd dtor en el desmontaje de la tabla de p\u00e1ginas vmemmap Las tablas de p\u00e1ginas vmemmap, que se utilizan para RV64 con SPARSEMEM_VMEMMAP, se rellenan utilizando enormes tablas pmd (directorio intermedio de p\u00e1ginas). Sin embargo, la asignaci\u00f3n de pmd no utiliza el mecanismo gen\u00e9rico utilizado por el c\u00f3digo VMA (por ejemplo, pmd_alloc()), o el create_pgd_mapping()/alloc_pmd_late() espec\u00edfico de RISC-V. En su lugar, el c\u00f3digo de la tabla de p\u00e1ginas vmemmap asigna una p\u00e1gina y llama a vmemmap_set_pmd(). Esto da como resultado que el pmd ctor *no* se llame, ni tendr\u00eda sentido hacerlo. Ahora, al desmantelar un pmd de la tabla de p\u00e1ginas vmemmap, el c\u00f3digo de desinfecci\u00f3n llamar\u00eda incondicional e incorrectamente al pmd dtor, lo que da como resultado un bloqueo (en el mejor de los casos). Este problema se encontr\u00f3 al ejecutar las autopruebas de HMM: | herramientas/pruebas/autopruebas/mm# ./test_hmm.sh smoke | ... # al descargar el m\u00f3dulo test_hmm.ko | p\u00e1gina: refcount:1 mapcount:0 mapping:0000000000000000 \u00edndice:0x0 pfn:0x10915b | banderas: 0x1000000000000000(nodo=0|zona=1) | crudo: 1000000000000000 0000000000000000 dead0000000000122 0000000000000000 | raw: 0000000000000000 000000000000000 00000001ffffffff 0000000000000000 | p\u00e1gina volcada porque: VM_BUG_ON_PAGE(ptdesc-\u0026gt;pmd_huge_pte) | ------------[ cortar aqu\u00ed ]------------ | \u00a1ERROR del kernel en include/linux/mm.h:3080! | ERROR del kernel [#1] | M\u00f3dulos vinculados en: test_hmm(-) sch_fq_codel fuse drm drm_panel_orientation_quirks backlight dm_mod | CPU: 1 UID: 0 PID: 514 Comm: modprobe Contaminado: GW 6.12.0-00982-gf2a4f1682d07 #2 | Contaminado: [W]=WARN | Nombre del hardware: riscv-virtio qemu/qemu, BIOS 2024.10 10/01/2024 | epc : remove_pgd_mapping+0xbec/0x1070 | ra : remove_pgd_mapping+0xbec/0x1070 | epc : ffffffff80010a68 ra : ffffffff80010a68 sp : ff20000000a73940 | gp : ffffffff827b2d88 tp : ff6000008785da40 t0 : ffffffff80fbce04 | t1: 0720072007200720 t2: 706d756420656761 s0: ff20000000a73a50 | s1: ff6000008915cff8 a0: 0000000000000039 a1: 00000000000000008 | a2: ff600003fff0de20 a3: 0000000000000000 a4: 0000000000000000 | a5: 0000000000000000 a6: c0000000fffffff a7: ffffffff824469b8 | s2: ff1c0000022456c0 s3: ff1ffffffdbfffff s4: ff6000008915c000 | s5: ff6000008915c000 s6: ff6000008915c000 s7: ff1ffffffdc00000 | s8: 0000000000000001 s9: ff1ffffffdc00000 s10: ffffffff819a31f0 | s11: ffffffffffffffff t3: ffffffff8000c950 t4: ff60000080244f00 | t5 : ff60000080244000 t6 : ff20000000a73708 | estado: 0000000200000120 direcci\u00f3n incorrecta: ffffffff80010a68 causa: 0000000000000003 | [] eliminar_map_pgd+0xbec/0x1070 | [] vmemmap_free+0x14/0x1e | [] desactivar_secci\u00f3n+0x220/0x452 | [] eliminar_secci\u00f3n_sparse+0x4a/0x58 | [] __eliminar_p\u00e1ginas+0x7e/0xba | [] memunmap_p\u00e1ginas+0x2bc/0x3fe | [] dmirror_dispositivo_eliminar_fragmentos+0x2ea/0x518 [prueba_hmm] | [] hmm_dmirror_exit+0x3e/0x1018 [prueba_hmm] | [] __riscv_sys_eliminar_m\u00f3dulo+0x15a/0x2a6 | [] do_trap_ecall_u+0x1f2/0x266 | [] _new_vmalloc_restore_context_a0+0xc6/0xd2 | C\u00f3digo: bf51 7597 0184 8593 76a5 854a 4097 0029 80e7 2c00 (9002) 7597 | ---[ fin del seguimiento 000000000000000 ]--- | P\u00e1nico del kernel - no sincroniza: Excepci\u00f3n fatal en la interrupci\u00f3n Agregue una verificaci\u00f3n para evitar llamar al dtor pmd, si el contexto de llamada es vmemmap_free()."
          }
        ],
        "id": "CVE-2024-56673",
        "lastModified": "2026-06-17T08:12:42.877",
        "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"
            },
            {
              "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-56673",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:59:31.187588Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-12-27T15:15:27.210",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/21f1b85c8912262adf51707e63614a114425eb10"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/344945806f2f7af68be98bac02836c867f223aa9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T13:58:15+00:00",
      "cve": "CVE-2024-56673",
      "id": "CVE-2024-56673",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: riscv: mm: Do not call pmd dtor on vmemmap page table teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56673.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "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"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-56673",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T19:59:31.187588Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "description": "CWE-noinfo Not enough information",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T15:46:04.278Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "arch/riscv/mm/init.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "344945806f2f7af68be98bac02836c867f223aa9",
                  "status": "affected",
                  "version": "c75a74f4ba19c904c0ae1e011ae2568449409ae4",
                  "versionType": "git"
                },
                {
                  "lessThan": "21f1b85c8912262adf51707e63614a114425eb10",
                  "status": "affected",
                  "version": "c75a74f4ba19c904c0ae1e011ae2568449409ae4",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "arch/riscv/mm/init.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.11"
                },
                {
                  "lessThan": "6.11",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.6",
                      "versionStartIncluding": "6.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "6.11",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Do not call pmd dtor on vmemmap page table teardown\n\nThe vmemmap\u0027s, which is used for RV64 with SPARSEMEM_VMEMMAP, page\ntables are populated using pmd (page middle directory) hugetables.\nHowever, the pmd allocation is not using the generic mechanism used by\nthe VMA code (e.g. pmd_alloc()), or the RISC-V specific\ncreate_pgd_mapping()/alloc_pmd_late(). Instead, the vmemmap page table\ncode allocates a page, and calls vmemmap_set_pmd(). This results in\nthat the pmd ctor is *not* called, nor would it make sense to do so.\n\nNow, when tearing down a vmemmap page table pmd, the cleanup code\nwould unconditionally, and incorrectly call the pmd dtor, which\nresults in a crash (best case).\n\nThis issue was found when running the HMM selftests:\n\n  | tools/testing/selftests/mm# ./test_hmm.sh smoke\n  | ... # when unloading the test_hmm.ko module\n  | page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10915b\n  | flags: 0x1000000000000000(node=0|zone=1)\n  | raw: 1000000000000000 0000000000000000 dead000000000122 0000000000000000\n  | raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000\n  | page dumped because: VM_BUG_ON_PAGE(ptdesc-\u003epmd_huge_pte)\n  | ------------[ cut here ]------------\n  | kernel BUG at include/linux/mm.h:3080!\n  | Kernel BUG [#1]\n  | Modules linked in: test_hmm(-) sch_fq_codel fuse drm drm_panel_orientation_quirks backlight dm_mod\n  | CPU: 1 UID: 0 PID: 514 Comm: modprobe Tainted: G        W          6.12.0-00982-gf2a4f1682d07 #2\n  | Tainted: [W]=WARN\n  | Hardware name: riscv-virtio qemu/qemu, BIOS 2024.10 10/01/2024\n  | epc : remove_pgd_mapping+0xbec/0x1070\n  |  ra : remove_pgd_mapping+0xbec/0x1070\n  | epc : ffffffff80010a68 ra : ffffffff80010a68 sp : ff20000000a73940\n  |  gp : ffffffff827b2d88 tp : ff6000008785da40 t0 : ffffffff80fbce04\n  |  t1 : 0720072007200720 t2 : 706d756420656761 s0 : ff20000000a73a50\n  |  s1 : ff6000008915cff8 a0 : 0000000000000039 a1 : 0000000000000008\n  |  a2 : ff600003fff0de20 a3 : 0000000000000000 a4 : 0000000000000000\n  |  a5 : 0000000000000000 a6 : c0000000ffffefff a7 : ffffffff824469b8\n  |  s2 : ff1c0000022456c0 s3 : ff1ffffffdbfffff s4 : ff6000008915c000\n  |  s5 : ff6000008915c000 s6 : ff6000008915c000 s7 : ff1ffffffdc00000\n  |  s8 : 0000000000000001 s9 : ff1ffffffdc00000 s10: ffffffff819a31f0\n  |  s11: ffffffffffffffff t3 : ffffffff8000c950 t4 : ff60000080244f00\n  |  t5 : ff60000080244000 t6 : ff20000000a73708\n  | status: 0000000200000120 badaddr: ffffffff80010a68 cause: 0000000000000003\n  | [\u003cffffffff80010a68\u003e] remove_pgd_mapping+0xbec/0x1070\n  | [\u003cffffffff80fd238e\u003e] vmemmap_free+0x14/0x1e\n  | [\u003cffffffff8032e698\u003e] section_deactivate+0x220/0x452\n  | [\u003cffffffff8032ef7e\u003e] sparse_remove_section+0x4a/0x58\n  | [\u003cffffffff802f8700\u003e] __remove_pages+0x7e/0xba\n  | [\u003cffffffff803760d8\u003e] memunmap_pages+0x2bc/0x3fe\n  | [\u003cffffffff02a3ca28\u003e] dmirror_device_remove_chunks+0x2ea/0x518 [test_hmm]\n  | [\u003cffffffff02a3e026\u003e] hmm_dmirror_exit+0x3e/0x1018 [test_hmm]\n  | [\u003cffffffff80102c14\u003e] __riscv_sys_delete_module+0x15a/0x2a6\n  | [\u003cffffffff80fd020c\u003e] do_trap_ecall_u+0x1f2/0x266\n  | [\u003cffffffff80fde0a2\u003e] _new_vmalloc_restore_context_a0+0xc6/0xd2\n  | Code: bf51 7597 0184 8593 76a5 854a 4097 0029 80e7 2c00 (9002) 7597\n  | ---[ end trace 0000000000000000 ]---\n  | Kernel panic - not syncing: Fatal exception in interrupt\n\nAdd a check to avoid calling the pmd dtor, if the calling context is\nvmemmap_free()."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:57:02.938Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/344945806f2f7af68be98bac02836c867f223aa9"
            },
            {
              "url": "https://git.kernel.org/stable/c/21f1b85c8912262adf51707e63614a114425eb10"
            }
          ],
          "title": "riscv: mm: Do not call pmd dtor on vmemmap page table teardown",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56673",
        "datePublished": "2024-12-27T15:06:34.280Z",
        "dateReserved": "2024-12-27T15:00:39.845Z",
        "dateUpdated": "2026-05-11T20:57:02.938Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

Sightings

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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.


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