122 lines
6.1 KiB
JSON
122 lines
6.1 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-2026-74645",
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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": "2026-08-15T05:44:03.923Z",
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"datePublished": "2026-08-22T15:32:22.645Z",
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"dateUpdated": "2026-08-22T15:32:22.645Z"
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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": "2026-08-22T15:32:22.645Z"
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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/damon/lru_sort: error out for >10000 active_mem_bp\n\ndamos_quota_score() can trigger division by zero if the target value is\nzero. DAMON_LRU_SORT lets users set the target value for the hot memory\nscheme via active_mem_bp parameter. It avoids setting it as the target\nvalue if the parameter value is zero. However, it also sets the cold\nmemory scheme with a target value that is calculated as '10000 -\nactive_mem_bp + 2'. Hence, if a user sets active_mem_bp 10002, the cold\nmemory scheme's quota goal target value can be zero. As a result,\ndivision by zero can be triggered. Fix by returning an error when the\nuser tries to start DAMON with >10000 active_mem_bp parameter value.\n\nIt makes no sense to set active_mem_bp with 10002. It also requires\nmodule parameters write permission to reproduce the issue. That said, the\nconsequence is quite bad.\n\nOne reliable way to reproduce the issue is like below:\n\n # cd /sys/module/damon_lru_sort/parameters\n # echo 1000 > wmarks_high\n # echo 995 > wmarks_mid\n # echo 0 > wmarks_low\n # echo 10002 > active_mem_bp\n # echo Y > enabled\n # dmesg -w\n [...]\n [ 597.421247] Oops: divide error: 0000 [#1] SMP NOPTI\n [ 597.428848] RIP: 0010:damos_quota_score+0x6f/0x480\n\nThis issue was discovered [1] by Sashiko."
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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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"mm/damon/lru_sort.c"
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],
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"versions": [
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{
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"version": "40d98d31cd7060228e03303c5c34ae7101020416",
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"lessThan": "e7e5e5e0dfe2ea171044c24c263efae4ee882b3f",
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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": "40d98d31cd7060228e03303c5c34ae7101020416",
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"lessThan": "06befa61c427e74319781e6f35a364cfc32dbae8",
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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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"mm/damon/lru_sort.c"
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],
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"versions": [
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{
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"version": "7.0",
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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": "7.0",
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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": "7.1.9",
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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": "7.0",
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"versionEndExcluding": "7.1.9"
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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": "7.0",
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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/e7e5e5e0dfe2ea171044c24c263efae4ee882b3f"
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},
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{
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"url": "https://git.kernel.org/stable/c/06befa61c427e74319781e6f35a364cfc32dbae8"
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}
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],
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"title": "mm/damon/lru_sort: error out for >10000 active_mem_bp",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |