143 lines
7.3 KiB
JSON
143 lines
7.3 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-2026-74643",
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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": "2026-08-15T05:44:03.922Z",
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"datePublished": "2026-08-22T15:32:21.140Z",
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"dateUpdated": "2026-08-22T15:32:21.140Z"
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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": "2026-08-22T15:32:21.140Z"
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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\nsamples/damon/mtier: error out for zero quota goal target values\n\nPatch series \"mm/damon: avoid division by zero from damos_quota_score()\".\n\nDAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division\nby zero in damos_quota_score(). Avoid it by adding parameters validation\nchecks.\n\n\nThis patch (of 2):\n\ndamos_quota_score() can trigger division by zero if the target_value is\nzero. DAMON_SAMPLE_MTIER lets users set the target_value via\nnode0_mem_{used,free}_bp parameters. It doesn't guard zero value case,\nthough. As a result, users can trigger division by zero. Fix the issue\nby returning an error when the user tries to start DAMON with zero\nnode0_mem_{used,free}_bp parameter values.\n\nDAMON_SAMPLE_MTIER is just a sample module, but the consequence is quite\nbad. Also the zero node0_mem_free_bp parameter might look like a\nreasonable setup to some users. Hence, the issue might really happen in\nthe real world.\n\nOne reliable way to reproduce the issue is like below:\n\n # cd /sys/module/damon_sample_mtier/parameters\n # echo 4096 > node0_start_addr\n # echo 8192 > node0_end_addr\n # echo 8192 > node1_start_addr\n # echo 81920 > node1_end_addr\n # echo 0 > node0_mem_free_bp\n # echo Y > enabled\n # dmesg -w\n [...]\n [18792.235916] Oops: divide error: 0000 [#1] SMP NOPTI\n [...]\n [18792.242787] RIP: 0010:damos_quota_score+0x6f/0x480\n [...]\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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"samples/damon/mtier.c"
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],
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"versions": [
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{
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"version": "c5e67d40a10234541e220750297304df79aaedd0",
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"lessThan": "e16b8d640ec99b28bc827560edcf9706e610c3aa",
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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": "c5e67d40a10234541e220750297304df79aaedd0",
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"lessThan": "684f271210becd7b8c4088f06c442499e48a43a0",
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"status": "affected",
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},
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{
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"version": "c5e67d40a10234541e220750297304df79aaedd0",
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"lessThan": "a16fd3ad9d89b05475864da97327870464611736",
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"status": "affected",
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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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"samples/damon/mtier.c"
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],
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"versions": [
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{
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"version": "6.17",
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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": "6.17",
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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": "6.18.45",
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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": "7.1.9",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "6.18.45"
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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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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/e16b8d640ec99b28bc827560edcf9706e610c3aa"
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},
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{
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"url": "https://git.kernel.org/stable/c/684f271210becd7b8c4088f06c442499e48a43a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/a16fd3ad9d89b05475864da97327870464611736"
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}
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],
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"title": "samples/damon/mtier: error out for zero quota goal target values",
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"engine": "bippy-1.2.0"
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}
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