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This is because we keep MF_COUNT_INCREASED flag in\nsecond try but the refcnt is not increased.\n\n page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n ------------[ cut here ]------------\n kernel BUG at include/linux/mm.h:737!\n invalid opcode: 0000 [#1] PREEMPT SMP\n CPU: 5 PID: 2135 Comm: sshd Tainted: G B 5.16.0-rc6-dirty #373\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n RIP: release_pages+0x53f/0x840\n Call Trace:\n free_pages_and_swap_cache+0x64/0x80\n tlb_flush_mmu+0x6f/0x220\n unmap_page_range+0xe6c/0x12c0\n unmap_single_vma+0x90/0x170\n unmap_vmas+0xc4/0x180\n exit_mmap+0xde/0x3a0\n mmput+0xa3/0x250\n do_exit+0x564/0x1470\n do_group_exit+0x3b/0x100\n __do_sys_exit_group+0x13/0x20\n __x64_sys_exit_group+0x16/0x20\n do_syscall_64+0x34/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n Modules linked in:\n ---[ end trace e99579b570fe0649 ]---\n RIP: 0010:release_pages+0x53f/0x840"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.89", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.12", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "5.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:03:55.428Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47090", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:03:55.428Z", "dateReserved": "2024-02-29T22:33:44.300Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-03-04T18:10:28.887Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

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The BUG() is triggered when retrying\nget_any_page(). This is because we keep MF_COUNT_INCREASED flag in\nsecond try but the refcnt is not increased.\n\n page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n ------------[ cut here ]------------\n kernel BUG at include/linux/mm.h:737!\n invalid opcode: 0000 [#1] PREEMPT SMP\n CPU: 5 PID: 2135 Comm: sshd Tainted: G B 5.16.0-rc6-dirty #373\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n RIP: release_pages+0x53f/0x840\n Call Trace:\n free_pages_and_swap_cache+0x64/0x80\n tlb_flush_mmu+0x6f/0x220\n unmap_page_range+0xe6c/0x12c0\n unmap_single_vma+0x90/0x170\n unmap_vmas+0xc4/0x180\n exit_mmap+0xde/0x3a0\n mmput+0xa3/0x250\n do_exit+0x564/0x1470\n do_group_exit+0x3b/0x100\n __do_sys_exit_group+0x13/0x20\n __x64_sys_exit_group+0x16/0x20\n do_syscall_64+0x34/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n Modules linked in:\n ---[ end trace e99579b570fe0649 ]---\n RIP: 0010:release_pages+0x53f/0x840"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mm/hwpoison: borre MF_COUNT_INCREASED antes de volver a intentar get_any_page() Hulk Robot inform\u00f3 un p\u00e1nico en put_page_testzero() al probar madvise() con MADV_SOFT_OFFLINE. El ERROR() se activa al volver a intentar get_any_page(). Esto se debe a que mantenemos el indicador MF_COUNT_INCREASED en el segundo intento pero el refcnt no aumenta. p\u00e1gina volcada porque: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cortar aqu\u00ed ]------------ ERROR del kernel en include/linux/mm .h:737! c\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] PREEMPT SMP CPU: 5 PID: 2135 Comm: sshd Contaminado: GB 5.16.0-rc6-dirty #373 Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.13.0- 1ubuntu1.1 01/04/2014 RIP: release_pages+0x53f/0x840 Seguimiento de llamadas: free_pages_and_swap_cache+0x64/0x80 tlb_flush_mmu+0x6f/0x220 unmap_page_range+0xe6c/0x12c0 unmap_single_vma+0x90/0x170 unmap _vmas+0xc4/0x180 salida_mmap+0xde/0x3a0 mmput+ 0xa3/0x250 do_exit+0x564/0x1470 do_group_exit+0x3b/0x100 __do_sys_exit_group+0x13/0x20 __x64_sys_exit_group+0x16/0x20 do_syscall_64+0x34/0x80 Entry_SYSCALL_64_after_hwframe+ 0x44/0xae M\u00f3dulos vinculados en: ---[ end trace e99579b570fe0649 ]--- RIP: 0010:p\u00e1ginas_de_liberaci\u00f3n+0x53f/0x840"}], "id": "CVE-2021-47090", "lastModified": "2025-02-14T14:31:43.180", "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": "2024-03-04T18:15:07.610", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/1f207076740101fed87074a6bc924dbe806f08a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/2a57d83c78f889bf3f54eede908d0643c40d5418"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/c691e7575eff76e563b0199c23ec46bd454f43e3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/1f207076740101fed87074a6bc924dbe806f08a5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/2a57d83c78f889bf3f54eede908d0643c40d5418"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/c691e7575eff76e563b0199c23ec46bd454f43e3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page()", "id": "2267935", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267935"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page()\nHulk Robot reported a panic in put_page_testzero() when testing\nmadvise() with MADV_SOFT_OFFLINE. The BUG() is triggered when retrying\nget_any_page(). This is because we keep MF_COUNT_INCREASED flag in\nsecond try but the refcnt is not increased.\npage dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n------------[ cut here ]------------\nkernel BUG at include/linux/mm.h:737!\ninvalid opcode: 0000 [#1] PREEMPT SMP\nCPU: 5 PID: 2135 Comm: sshd Tainted: G B 5.16.0-rc6-dirty #373\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\nRIP: release_pages+0x53f/0x840\nCall Trace:\nfree_pages_and_swap_cache+0x64/0x80\ntlb_flush_mmu+0x6f/0x220\nunmap_page_range+0xe6c/0x12c0\nunmap_single_vma+0x90/0x170\nunmap_vmas+0xc4/0x180\nexit_mmap+0xde/0x3a0\nmmput+0xa3/0x250\ndo_exit+0x564/0x1470\ndo_group_exit+0x3b/0x100\n__do_sys_exit_group+0x13/0x20\n__x64_sys_exit_group+0x16/0x20\ndo_syscall_64+0x34/0x80\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nModules linked in:\n---[ end trace e99579b570fe0649 ]---\nRIP: 0010:release_pages+0x53f/0x840"], "name": "CVE-2021-47090", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47090\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47090\nhttps://lore.kernel.org/linux-cve-announce/2024030413-CVE-2021-47090-a429@gregkh/T"], "threat_severity": "Moderate"}

{}