CVE-2022-49778

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49778", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:17:33.805Z", "datePublished": "2025-05-01T14:09:13.828Z", "dateUpdated": "2026-05-11T19:06:36.025Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:06:36.025Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/mm: fix incorrect file_map_count for non-leaf pmd/pud\n\nThe page table check trigger BUG_ON() unexpectedly when collapse hugepage:\n\n ------------[ cut here ]------------\n kernel BUG at mm/page_table_check.c:82!\n Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n Dumping ftrace buffer:\n (ftrace buffer empty)\n Modules linked in:\n CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750\n Hardware name: linux,dummy-virt (DT)\n pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : page_table_check_clear.isra.0+0x258/0x3f0\n lr : page_table_check_clear.isra.0+0x240/0x3f0\n[...]\n Call trace:\n page_table_check_clear.isra.0+0x258/0x3f0\n __page_table_check_pmd_clear+0xbc/0x108\n pmdp_collapse_flush+0xb0/0x160\n collapse_huge_page+0xa08/0x1080\n hpage_collapse_scan_pmd+0xf30/0x1590\n khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8\n khugepaged+0x338/0x518\n kthread+0x278/0x2f8\n ret_from_fork+0x10/0x20\n[...]\n\nSince pmd_user_accessible_page() doesn't check if a pmd is leaf, it\ndecrease file_map_count for a non-leaf pmd comes from collapse_huge_page().\nand so trigger BUG_ON() unexpectedly.\n\nFix this problem by using pmd_leaf() insteal of pmd_present() in\npmd_user_accessible_page(). Moreover, use pud_leaf() for\npud_user_accessible_page() too."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/pgtable.h"], "versions": [{"version": "42b2547137f5c974bb1bfd657c869fe96b96d86f", "lessThan": "2d458046df634088611d44fd77f45465e833ef78", "status": "affected", "versionType": "git"}, {"version": "42b2547137f5c974bb1bfd657c869fe96b96d86f", "lessThan": "5b47348fc0b18a78c96f8474cc90b7525ad1bbfe", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/pgtable.h"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.10", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2d458046df634088611d44fd77f45465e833ef78"}, {"url": "https://git.kernel.org/stable/c/5b47348fc0b18a78c96f8474cc90b7525ad1bbfe"}], "title": "arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/pgtable.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2d458046df634088611d44fd77f45465e833ef78", "status": "affected", "version": "42b2547137f5c974bb1bfd657c869fe96b96d86f", "versionType": "git"}, {"lessThan": "5b47348fc0b18a78c96f8474cc90b7525ad1bbfe", "status": "affected", "version": "42b2547137f5c974bb1bfd657c869fe96b96d86f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/pgtable.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"lessThan": "5.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.0.*", "status": "unaffected", "version": "6.0.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "34351652-9335-4383-BE7F-D0AA497D8C41", "versionEndExcluding": "6.0.10", "versionStartIncluding": "5.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "35B26BE4-43A6-4A36-A7F6-5B3F572D9186", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/mm: fix incorrect file_map_count for non-leaf pmd/pud\n\nThe page table check trigger BUG_ON() unexpectedly when collapse hugepage:\n\n ------------[ cut here ]------------\n kernel BUG at mm/page_table_check.c:82!\n Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n Dumping ftrace buffer:\n (ftrace buffer empty)\n Modules linked in:\n CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750\n Hardware name: linux,dummy-virt (DT)\n pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : page_table_check_clear.isra.0+0x258/0x3f0\n lr : page_table_check_clear.isra.0+0x240/0x3f0\n[...]\n Call trace:\n page_table_check_clear.isra.0+0x258/0x3f0\n __page_table_check_pmd_clear+0xbc/0x108\n pmdp_collapse_flush+0xb0/0x160\n collapse_huge_page+0xa08/0x1080\n hpage_collapse_scan_pmd+0xf30/0x1590\n khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8\n khugepaged+0x338/0x518\n kthread+0x278/0x2f8\n ret_from_fork+0x10/0x20\n[...]\n\nSince pmd_user_accessible_page() doesn't check if a pmd is leaf, it\ndecrease file_map_count for a non-leaf pmd comes from collapse_huge_page().\nand so trigger BUG_ON() unexpectedly.\n\nFix this problem by using pmd_leaf() insteal of pmd_present() in\npmd_user_accessible_page(). Moreover, use pud_leaf() for\npud_user_accessible_page() too."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64/mm: corrige el file_map_count incorrecto para pmd/pud que no es de hoja. La comprobaci\u00f3n de la tabla de p\u00e1ginas se activa inesperadamente BUG_ON() cuando se colapsa hugepage: ------------[ cortar aqu\u00ed ]------------ \u00a1ERROR del kernel en mm/page_table_check.c:82! Error interno: Ups - BUG: 00000000f2000800 [#1] SMP Volcando b\u00fafer ftrace: (b\u00fafer ftrace vac\u00edo) M\u00f3dulos enlazados: CPU: 6 PID: 68 Comm: khugepaged No contaminado 6.1.0-rc3+ #750 Nombre del hardware: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : page_table_check_clear.isra.0+0x258/0x3f0 lr : page_table_check_clear.isra.0+0x240/0x3f0 [...] Rastreo de llamadas: page_table_check_clear.isra.0+0x258/0x3f0 __page_table_check_pmd_clear+0xbc/0x108 pmdp_collapse_flush+0xb0/0x160 collapse_huge_page+0xa08/0x1080 hpage_collapse_scan_pmd+0xf30/0x1590 khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8 khugepaged+0x338/0x518 kthread+0x278/0x2f8 ret_from_fork+0x10/0x20 [...] Dado que pmd_user_accessible_page() no comprueba si un pmd es hoja, disminuye file_map_count para un pmd que no es hoja que proviene de colapso_huge_page() y, por lo tanto, activa BUG_ON() inesperadamente. Solucione este problema usando pmd_leaf() en lugar de pmd_present() en pmd_user_accessible_page(). Adem\u00e1s, use pud_leaf() para pud_user_accessible_page()."}], "id": "CVE-2022-49778", "lastModified": "2026-06-17T05:19:07.423", "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": "2025-05-01T15:16:00.980", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d458046df634088611d44fd77f45465e833ef78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b47348fc0b18a78c96f8474cc90b7525ad1bbfe"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud", "id": "2363427", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363427"}, "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": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\narm64/mm: fix incorrect file_map_count for non-leaf pmd/pud\nThe page table check trigger BUG_ON() unexpectedly when collapse hugepage:\n------------[ cut here ]------------\nkernel BUG at mm/page_table_check.c:82!\nInternal error: Oops - BUG: 00000000f2000800 [#1] SMP\nDumping ftrace buffer:\n(ftrace buffer empty)\nModules linked in:\nCPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750\nHardware name: linux,dummy-virt (DT)\npstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : page_table_check_clear.isra.0+0x258/0x3f0\nlr : page_table_check_clear.isra.0+0x240/0x3f0\n[...]\nCall trace:\npage_table_check_clear.isra.0+0x258/0x3f0\n__page_table_check_pmd_clear+0xbc/0x108\npmdp_collapse_flush+0xb0/0x160\ncollapse_huge_page+0xa08/0x1080\nhpage_collapse_scan_pmd+0xf30/0x1590\nkhugepaged_scan_mm_slot.constprop.0+0x52c/0xac8\nkhugepaged+0x338/0x518\nkthread+0x278/0x2f8\nret_from_fork+0x10/0x20\n[...]\nSince pmd_user_accessible_page() doesn't check if a pmd is leaf, it\ndecrease file_map_count for a non-leaf pmd comes from collapse_huge_page().\nand so trigger BUG_ON() unexpectedly.\nFix this problem by using pmd_leaf() insteal of pmd_present() in\npmd_user_accessible_page(). Moreover, use pud_leaf() for\npud_user_accessible_page() too."], "name": "CVE-2022-49778", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49778\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49778\nhttps://lore.kernel.org/linux-cve-announce/2025050118-CVE-2022-49778-ea15@gregkh/T"], "threat_severity": "Moderate"}

{}