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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 · CISA-ADP (v2.0.3)
Decision recorded 2024-06-20 13:35 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < d3533ee20e9a0e2e8f60384da7450d43d1c63d1a (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < 352715593e81b917ce1b321e794549815b850134 (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < a5389c80992f0001ee505838fe6a8b20897ce96e (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < cebb0aceb21ad91429617a40e3a17444fabf1529 (git)
Affected: 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 , < c10a0f877fe007021d70f9cada240f42adc2b5db (git)
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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)
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          "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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            "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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              "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"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-23T13:20:06.320Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "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"
            }
          ],
          "title": "mm/kmemleak: avoid scanning potential huge holes",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48731",
        "datePublished": "2024-06-20T11:13:19.407Z",
        "dateReserved": "2024-06-20T11:09:39.053Z",
        "dateUpdated": "2025-12-23T13:20:06.320Z",
        "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.

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