CVE-2022-48731 (GCVE-0-2022-48731)

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2026-05-11 18:45
VLAI
Title
mm/kmemleak: avoid scanning potential huge holes
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid scanning potential huge holes When using devm_request_free_mem_region() and devm_memremap_pages() to add ZONE_DEVICE memory, if requested free mem region's end pfn were huge(e.g., 0x400000000), the node_end_pfn() will be also huge (see move_pfn_range_to_zone()). Thus it creates a huge hole between node_start_pfn() and node_end_pfn(). We found on some AMD APUs, amdkfd requested such a free mem region and created a huge hole. In such a case, following code snippet was just doing busy test_bit() looping on the huge hole. for (pfn = start_pfn; pfn < end_pfn; pfn++) { struct page *page = pfn_to_online_page(pfn); if (!page) continue; ... } So we got a soft lockup: watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221] CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1 RIP: 0010:pfn_to_online_page+0x5/0xd0 Call Trace: ? 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+0x44/0xae I did some tests with the patch. (1) amdgpu module unloaded before the patch: real 0m0.976s user 0m0.000s sys 0m0.968s after the patch: real 0m0.981s user 0m0.000s sys 0m0.973s (2) amdgpu module loaded before the patch: real 0m35.365s user 0m0.000s sys 0m35.354s after the patch: real 0m1.049s user 0m0.000s sys 0m1.042s
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 (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < d3533ee20e9a0e2e8f60384da7450d43d1c63d1a (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < 352715593e81b917ce1b321e794549815b850134 (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < a5389c80992f0001ee505838fe6a8b20897ce96e (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < cebb0aceb21ad91429617a40e3a17444fabf1529 (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < c10a0f877fe007021d70f9cada240f42adc2b5db (git)
Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.4.178 , ≤ 5.4.* (semver)
Unaffected: 5.10.99 , ≤ 5.10.* (semver)
Unaffected: 5.15.22 , ≤ 5.15.* (semver)
Unaffected: 5.16.8 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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      "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\u0027s 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 \u003c 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 \u0026lt; 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\"}]",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48731\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:11.517\",\"lastModified\":\"2026-06-17T05:16:02.510\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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\u0027s 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 \u003c 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 \u0026lt; 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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"mm/kmemleak.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\",\"lessThan\":\"d3533ee20e9a0e2e8f60384da7450d43d1c63d1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\",\"lessThan\":\"352715593e81b917ce1b321e794549815b850134\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\",\"lessThan\":\"a5389c80992f0001ee505838fe6a8b20897ce96e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\",\"lessThan\":\"cebb0aceb21ad91429617a40e3a17444fabf1529\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\",\"lessThan\":\"c10a0f877fe007021d70f9cada240f42adc2b5db\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"mm/kmemleak.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.178\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.99\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.22\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16.8\",\"lessThanOrEqual\":\"5.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-06-20T13:35:34.134503Z\",\"id\":\"CVE-2022-48731\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.4.178\",\"matchCriteriaId\":\"A55ED659-C576-45B7-A8B0-3CD30AA67FAB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.99\",\"matchCriteriaId\":\"FA1C3B80-458E-4F34-A0BF-5223557F2863\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.22\",\"matchCriteriaId\":\"74528AA6-B524-4C3F-B188-1194235FE47D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.8\",\"matchCriteriaId\":\"0623892A-E3E4-44E6-8A5E-39A0B47AF782\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"E6E34B23-78B4-4516-9BD8-61B33F4AC49A\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"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\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:39:47+00:00",
      "cve": "CVE-2022-48731",
      "id": "CVE-2022-48731",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/kmemleak: avoid scanning potential huge holes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48731.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"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\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T15:25:01.574Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48731\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-20T13:35:34.134503Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-20T13:35:38.300Z\"}}], \"cna\": {\"title\": \"mm/kmemleak: avoid scanning potential huge holes\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\", \"lessThan\": \"d3533ee20e9a0e2e8f60384da7450d43d1c63d1a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\", \"lessThan\": \"352715593e81b917ce1b321e794549815b850134\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\", \"lessThan\": \"a5389c80992f0001ee505838fe6a8b20897ce96e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\", \"lessThan\": \"cebb0aceb21ad91429617a40e3a17444fabf1529\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378\", \"lessThan\": \"c10a0f877fe007021d70f9cada240f42adc2b5db\", \"versionType\": \"git\"}], \"programFiles\": [\"mm/kmemleak.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.99\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"mm/kmemleak.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a\"}, {\"url\": \"https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134\"}, {\"url\": \"https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e\"}, {\"url\": \"https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529\"}, {\"url\": \"https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\u0027s 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 \u003c 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\"}",
      "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

Author Source Type Date Other

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.