CVE-2022-48731 (GCVE-0-2022-48731)
Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2025-05-04 08:21
VLAI?
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)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d3533ee20e9a0e2e8f60384da7450d43d1c63d1a
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 352715593e81b917ce1b321e794549815b850134 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a5389c80992f0001ee505838fe6a8b20897ce96e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cebb0aceb21ad91429617a40e3a17444fabf1529 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c10a0f877fe007021d70f9cada240f42adc2b5db (git) |
||
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"id": "CVE-2022-48731",
"lastModified": "2024-11-21T07:33:53.020",
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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\"}],\"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}]},\"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\"]}]}}",
"vulnrichment": {
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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 \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\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.99\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.22\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:21:55.868Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2022-48731\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:21:55.868Z\", \"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": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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