143 lines
7.7 KiB
JSON
143 lines
7.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64295",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.778Z",
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"datePublished": "2026-07-25T08:49:33.194Z",
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"dateUpdated": "2026-08-17T04:52:52.693Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T04:52:52.693Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: page_ext: add count limit to page_ext_iter_next to prevent invalid PFN access\n\nThe page_ext iteration API does not validate if the PFN still belongs to a\nvalid section while advancing the iterator. When dynamically adding\nmemory in the hotplug path, it can lead to a NULL pointer dereference\nduring page_ext_lookup at the boundary of the last valid section when\niterator count equals __pgcount.\n\nThe for_each_page_ext() macro calls page_ext_iter_next() as its loop\nincrement. for_each_page_ext() does a \"__page_ext =\npage_ext_iter_next(&__iter)\" at the end. This causes page_ext_iter_next()\nto increment iter->index past __pgcount and call page_ext_lookup(start_pfn\n+ __pgcount). During memory hotplug (online), the PFN at start_pfn +\n__pgcount may belong to a section that has not yet been initialized,\ncausing page_ext_lookup() to trigger a NULL pointer dereference.\n\n[ 14.555124][ T846] Call trace:\n[ 14.555125][ T846] lookup_page_ext+0x6c/0x108 (P)\n[ 14.555127][ T846] page_ext_lookup+0x30/0x3c\n[ 14.555129][ T846] __reset_page_owner+0x11c/0x260\n[ 14.571201][ T846] __free_pages_ok+0x5e8/0x8e0\n[ 14.571204][ T846] __free_pages_core+0x78/0xf0\n[ 14.571206][ T846] generic_online_page+0x14/0x24\n[ 14.597782][ T846] online_pages+0x178/0x30c\n[ 14.597784][ T846] memory_block_change_state+0x284/0x32c\n[ 14.597787][ T846] memory_subsys_online+0x4c/0x64\n[ 14.597789][ T846] device_online+0x88/0xb0\n[ 14.597791][ T846] online_memory_block+0x30/0x40\n[ 14.597793][ T846] walk_memory_blocks+0xac/0xe8\n[ 14.597794][ T846] add_memory_resource+0x280/0x298\n[ 14.656161][ T846] add_memory+0x60/0x98\n\nMove the iteration boundary enforcement inside the iterator functions, so\ncallers cannot inadvertently access beyond the requested range."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/page_ext.h"
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],
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"versions": [
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{
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"version": "9039b9096ea27a20f0349d1537537663c935c8ed",
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"lessThan": "8dcaa0f87a88d720d13106f3a306c6b61d189d86",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9039b9096ea27a20f0349d1537537663c935c8ed",
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"lessThan": "377b1cd6bbcf327338cd951cc2fd74bc75540235",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9039b9096ea27a20f0349d1537537663c935c8ed",
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"lessThan": "ffd017237cfe99e6e5602ab14179b0e6878a0840",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/page_ext.h"
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],
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"versions": [
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{
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"version": "6.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.39",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.39"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.1.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8dcaa0f87a88d720d13106f3a306c6b61d189d86"
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},
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{
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"url": "https://git.kernel.org/stable/c/377b1cd6bbcf327338cd951cc2fd74bc75540235"
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},
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{
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"url": "https://git.kernel.org/stable/c/ffd017237cfe99e6e5602ab14179b0e6878a0840"
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}
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],
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"title": "mm: page_ext: add count limit to page_ext_iter_next to prevent invalid PFN access",
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"x_generator": {
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} |