CVE-2022-48731

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-48731", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-20T11:09:39.053Z", "datePublished": "2024-06-20T11:13:19.407Z", "dateUpdated": "2026-05-11T18:45:52.174Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T18:45:52.174Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid scanning potential huge holes\n\nWhen using devm_request_free_mem_region() and devm_memremap_pages() to\nadd ZONE_DEVICE memory, if requested free mem region's end pfn were\nhuge(e.g., 0x400000000), the node_end_pfn() will be also huge (see\nmove_pfn_range_to_zone()). Thus it creates a huge hole between\nnode_start_pfn() and node_end_pfn().\n\nWe found on some AMD APUs, amdkfd requested such a free mem region and\ncreated a huge hole. In such a case, following code snippet was just\ndoing busy test_bit() looping on the huge hole.\n\n for (pfn = start_pfn; pfn < end_pfn; pfn++) {\n\tstruct page *page = pfn_to_online_page(pfn);\n\t\tif (!page)\n\t\t\tcontinue;\n\t...\n }\n\nSo we got a soft lockup:\n\n watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]\n CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1\n RIP: 0010:pfn_to_online_page+0x5/0xd0\n Call Trace:\n ? kmemleak_scan+0x16a/0x440\n kmemleak_write+0x306/0x3a0\n ? common_file_perm+0x72/0x170\n full_proxy_write+0x5c/0x90\n vfs_write+0xb9/0x260\n ksys_write+0x67/0xe0\n __x64_sys_write+0x1a/0x20\n do_syscall_64+0x3b/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nI did some tests with the patch.\n\n(1) amdgpu module unloaded\n\nbefore the patch:\n\n real 0m0.976s\n user 0m0.000s\n sys 0m0.968s\n\nafter the patch:\n\n real 0m0.981s\n user 0m0.000s\n sys 0m0.973s\n\n(2) amdgpu module loaded\n\nbefore the patch:\n\n real 0m35.365s\n user 0m0.000s\n sys 0m35.354s\n\nafter the patch:\n\n real 0m1.049s\n user 0m0.000s\n sys 0m1.042s"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/kmemleak.c"], "versions": [{"version": "4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378", "lessThan": "d3533ee20e9a0e2e8f60384da7450d43d1c63d1a", "status": "affected", "versionType": "git"}, {"version": "4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378", "lessThan": "352715593e81b917ce1b321e794549815b850134", "status": "affected", "versionType": "git"}, {"version": "4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378", "lessThan": "a5389c80992f0001ee505838fe6a8b20897ce96e", "status": "affected", "versionType": "git"}, {"version": "4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378", "lessThan": "cebb0aceb21ad91429617a40e3a17444fabf1529", "status": "affected", "versionType": "git"}, {"version": "4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378", "lessThan": "c10a0f877fe007021d70f9cada240f42adc2b5db", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/kmemleak.c"], "versions": [{"version": "4.14", "status": "affected"}, {"version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.178", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.99", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.22", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16.8", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.17", "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": "4.14", "versionEndExcluding": "5.4.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.10.99"}, 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"shortName": "CVE", "dateUpdated": "2024-08-03T15:25:01.574Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db", "tags": ["x_transferred"]}]}]}}

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Thus it creates a huge hole between\nnode_start_pfn() and node_end_pfn().\n\nWe found on some AMD APUs, amdkfd requested such a free mem region and\ncreated a huge hole. In such a case, following code snippet was just\ndoing busy test_bit() looping on the huge hole.\n\n for (pfn = start_pfn; pfn < end_pfn; pfn++) {\n\tstruct page *page = pfn_to_online_page(pfn);\n\t\tif (!page)\n\t\t\tcontinue;\n\t...\n }\n\nSo we got a soft lockup:\n\n watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]\n CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1\n RIP: 0010:pfn_to_online_page+0x5/0xd0\n Call Trace:\n ? kmemleak_scan+0x16a/0x440\n kmemleak_write+0x306/0x3a0\n ? common_file_perm+0x72/0x170\n full_proxy_write+0x5c/0x90\n vfs_write+0xb9/0x260\n ksys_write+0x67/0xe0\n __x64_sys_write+0x1a/0x20\n do_syscall_64+0x3b/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nI did some tests with the patch.\n\n(1) amdgpu module unloaded\n\nbefore the patch:\n\n real 0m0.976s\n user 0m0.000s\n sys 0m0.968s\n\nafter the patch:\n\n real 0m0.981s\n user 0m0.000s\n sys 0m0.973s\n\n(2) amdgpu module loaded\n\nbefore the patch:\n\n real 0m35.365s\n user 0m0.000s\n sys 0m35.354s\n\nafter the patch:\n\n real 0m1.049s\n user 0m0.000s\n sys 0m1.042s"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.178", "versionStartIncluding": "4.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.99", "versionStartIncluding": "4.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.22", "versionStartIncluding": "4.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16.8", "versionStartIncluding": "4.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.17", "versionStartIncluding": "4.14"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-23T13:20:06.320Z"}}}, "cveMetadata": {"cveId": "CVE-2022-48731", "state": "PUBLISHED", "dateUpdated": "2025-12-23T13:20:06.320Z", "dateReserved": "2024-06-20T11:09:39.053Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-20T11:13:19.407Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Thus it creates a huge hole between\nnode_start_pfn() and node_end_pfn().\n\nWe found on some AMD APUs, amdkfd requested such a free mem region and\ncreated a huge hole. In such a case, following code snippet was just\ndoing busy test_bit() looping on the huge hole.\n\n for (pfn = start_pfn; pfn < end_pfn; pfn++) {\n\tstruct page *page = pfn_to_online_page(pfn);\n\t\tif (!page)\n\t\t\tcontinue;\n\t...\n }\n\nSo we got a soft lockup:\n\n watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]\n CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1\n RIP: 0010:pfn_to_online_page+0x5/0xd0\n Call Trace:\n ? kmemleak_scan+0x16a/0x440\n kmemleak_write+0x306/0x3a0\n ? common_file_perm+0x72/0x170\n full_proxy_write+0x5c/0x90\n vfs_write+0xb9/0x260\n ksys_write+0x67/0xe0\n __x64_sys_write+0x1a/0x20\n do_syscall_64+0x3b/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nI did some tests with the patch.\n\n(1) amdgpu module unloaded\n\nbefore the patch:\n\n real 0m0.976s\n user 0m0.000s\n sys 0m0.968s\n\nafter the patch:\n\n real 0m0.981s\n user 0m0.000s\n sys 0m0.973s\n\n(2) amdgpu module loaded\n\nbefore the patch:\n\n real 0m35.365s\n user 0m0.000s\n sys 0m35.354s\n\nafter the patch:\n\n real 0m1.049s\n user 0m0.000s\n sys 0m1.042s"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/kmemleak: evita escanear posibles agujeros enormes. Al usar devm_request_free_mem_region() y devm_memremap_pages() para agregar memoria ZONE_DEVICE, si se solicitaba, el pfn final de la regi\u00f3n de memoria libre era enorme (por ejemplo, 0x400000000), el node_end_pfn() tambi\u00e9n ser\u00e1 enorme (ver move_pfn_range_to_zone()). Por lo tanto, crea un enorme agujero entre node_start_pfn() y node_end_pfn(). Descubrimos que en algunas APU AMD, AMDKFD solicit\u00f3 una regi\u00f3n de memoria libre y cre\u00f3 un agujero enorme. En tal caso, el siguiente fragmento de c\u00f3digo simplemente estaba haciendo un bucle test_bit() ocupado en el enorme agujero. for (pfn = start_pfn; pfn &lt; end_pfn; pfn++) { estructura p\u00e1gina *p\u00e1gina = pfn_to_online_page(pfn); si (!p\u00e1gina) contin\u00faa; ... } Entonces obtuvimos un bloqueo suave: perro guardi\u00e1n: ERROR: bloqueo suave - \u00a1CPU#6 bloqueada durante 26 segundos! [bash:1221] CPU: 6 PID: 1221 Comm: bash No contaminado 5.15.0-custom #1 RIP: 0010:pfn_to_online_page+0x5/0xd0 Seguimiento de llamadas:? kmemleak_scan+0x16a/0x440 kmemleak_write+0x306/0x3a0 ? common_file_perm+0x72/0x170 full_proxy_write+0x5c/0x90 vfs_write+0xb9/0x260 ksys_write+0x67/0xe0 __x64_sys_write+0x1a/0x20 do_syscall_64+0x3b/0xc0 Entry_SYSCALL_64_after_hwframe+0x4 4/0xae Hice algunas pruebas con el parche. (1) m\u00f3dulo amdgpu descargado antes del parche: usuario real 0m0.976s 0m0.000s sys 0m0.968s despu\u00e9s del parche: usuario real 0m0.981s 0m0.000s sys 0m0.973s (2) m\u00f3dulo amdgpu cargado antes del parche: real 0m35 .365s usuario 0m0.000s sys 0m35.354s despu\u00e9s del parche: real 0m1.049s usuario 0m0.000s sys 0m1.042s"}], "id": "CVE-2022-48731", "lastModified": "2026-06-17T05:16:02.510", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48731", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-20T13:35:34.134503Z", "version": "2.0.3"}}]}, "published": "2024-06-20T12:15:11.517", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/kmemleak: avoid scanning potential huge holes", "id": "2293328", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293328"}, "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-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/kmemleak: avoid scanning potential huge holes\nWhen using devm_request_free_mem_region() and devm_memremap_pages() to\nadd ZONE_DEVICE memory, if requested free mem region's end pfn were\nhuge(e.g., 0x400000000), the node_end_pfn() will be also huge (see\nmove_pfn_range_to_zone()). Thus it creates a huge hole between\nnode_start_pfn() and node_end_pfn().\nWe found on some AMD APUs, amdkfd requested such a free mem region and\ncreated a huge hole. In such a case, following code snippet was just\ndoing busy test_bit() looping on the huge hole.\nfor (pfn = start_pfn; pfn < end_pfn; pfn++) {\nstruct page *page = pfn_to_online_page(pfn);\nif (!page)\ncontinue;\n...\n}\nSo we got a soft lockup:\nwatchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]\nCPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1\nRIP: 0010:pfn_to_online_page+0x5/0xd0\nCall Trace:\n? kmemleak_scan+0x16a/0x440\nkmemleak_write+0x306/0x3a0\n? common_file_perm+0x72/0x170\nfull_proxy_write+0x5c/0x90\nvfs_write+0xb9/0x260\nksys_write+0x67/0xe0\n__x64_sys_write+0x1a/0x20\ndo_syscall_64+0x3b/0xc0\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nI did some tests with the patch.\n(1) amdgpu module unloaded\nbefore the patch:\nreal 0m0.976s\nuser 0m0.000s\nsys 0m0.968s\nafter the patch:\nreal 0m0.981s\nuser 0m0.000s\nsys 0m0.973s\n(2) amdgpu module loaded\nbefore the patch:\nreal 0m35.365s\nuser 0m0.000s\nsys 0m35.354s\nafter the patch:\nreal 0m1.049s\nuser 0m0.000s\nsys 0m1.042s"], "name": "CVE-2022-48731", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48731\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48731\nhttps://lore.kernel.org/linux-cve-announce/2024062059-CVE-2022-48731-d547@gregkh/T"], "threat_severity": "Low"}

{}