{"api_version":"1","generated_at":"2026-05-30T02:17:43+00:00","cve":"CVE-2026-46020","urls":{"html":"https://cve.report/CVE-2026-46020","api":"https://cve.report/api/cve/CVE-2026-46020.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46020","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46020"},"summary":{"title":"mm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp\n\nPatch series \"mm/damon/core: validate damos_quota_goal->nid\".\n\nnode_mem[cg]_{used,free}_bp DAMOS quota goals receive the node id.  The\nnode id is used for si_meminfo_node() and NODE_DATA() without proper\nvalidation.  As a result, privileged users can trigger an out of bounds\nmemory access using DAMON_SYSFS.  Fix the issues.\n\nThe issue was originally reported [1] with a fix by another author.  The\noriginal author announced [2] that they will stop working including the\nfix that was still in the review stage.  Hence I'm restarting this.\n\n\nThis patch (of 2):\n\nUsers can set damos_quota_goal->nid with arbitrary value for\nnode_mem_{used,free}_bp.  But DAMON core is using those for\nsi_meminfo_node() without the validation of the value.  This can result in\nout of bounds memory access.  The issue can actually triggered using DAMON\nuser-space tool (damo), like below.\n\n    $ sudo ./damo start --damos_action stat \\\n    \t--damos_quota_goal node_mem_used_bp 50% -1 \\\n    \t--damos_quota_interval 1s\n    $ sudo dmesg\n    [...]\n    [   65.565986] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098\n\nFix this issue by adding the validation of the given node.  If an invalid\nnode id is given, it returns 0% for used memory ratio, and 100% for free\nmemory ratio.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:20","updated_at":"2026-05-27 14:48:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212","name":"https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2","name":"https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127","name":"https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46020","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46020","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e1c773b501f33437d87b72c7d26080361e224b1 b09958e235f2b9cd3898b85a8529172afa80d212 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e1c773b501f33437d87b72c7d26080361e224b1 bcad74078708f2330a45b55358ebc38f8f4b1127 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e1c773b501f33437d87b72c7d26080361e224b1 40250b2dded0604a112be605f3828700d80ad7c2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.27 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.4 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46020","cve":"CVE-2026-46020","epss":"0.000170000","percentile":"0.043360000","score_date":"2026-05-29","updated_at":"2026-05-30 00:13:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/damon/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b09958e235f2b9cd3898b85a8529172afa80d212","status":"affected","version":"0e1c773b501f33437d87b72c7d26080361e224b1","versionType":"git"},{"lessThan":"bcad74078708f2330a45b55358ebc38f8f4b1127","status":"affected","version":"0e1c773b501f33437d87b72c7d26080361e224b1","versionType":"git"},{"lessThan":"40250b2dded0604a112be605f3828700d80ad7c2","status":"affected","version":"0e1c773b501f33437d87b72c7d26080361e224b1","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["mm/damon/core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.16"},{"lessThan":"6.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.27","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.27","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"6.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp\n\nPatch series \"mm/damon/core: validate damos_quota_goal->nid\".\n\nnode_mem[cg]_{used,free}_bp DAMOS quota goals receive the node id.  The\nnode id is used for si_meminfo_node() and NODE_DATA() without proper\nvalidation.  As a result, privileged users can trigger an out of bounds\nmemory access using DAMON_SYSFS.  Fix the issues.\n\nThe issue was originally reported [1] with a fix by another author.  The\noriginal author announced [2] that they will stop working including the\nfix that was still in the review stage.  Hence I'm restarting this.\n\n\nThis patch (of 2):\n\nUsers can set damos_quota_goal->nid with arbitrary value for\nnode_mem_{used,free}_bp.  But DAMON core is using those for\nsi_meminfo_node() without the validation of the value.  This can result in\nout of bounds memory access.  The issue can actually triggered using DAMON\nuser-space tool (damo), like below.\n\n    $ sudo ./damo start --damos_action stat \\\n    \t--damos_quota_goal node_mem_used_bp 50% -1 \\\n    \t--damos_quota_interval 1s\n    $ sudo dmesg\n    [...]\n    [   65.565986] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098\n\nFix this issue by adding the validation of the given node.  If an invalid\nnode id is given, it returns 0% for used memory ratio, and 100% for free\nmemory ratio."}],"providerMetadata":{"dateUpdated":"2026-05-27T12:56:21.920Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212"},{"url":"https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127"},{"url":"https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2"}],"title":"mm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46020","datePublished":"2026-05-27T12:56:21.920Z","dateReserved":"2026-05-13T15:03:33.092Z","dateUpdated":"2026-05-27T12:56:21.920Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:20","lastModifiedDate":"2026-05-27 14:48:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46020","Ordinal":"1","Title":"mm/damon/core: validate damos_quota_goal->nid for node_mem_{used","CVE":"CVE-2026-46020","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46020","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp\n\nPatch series \"mm/damon/core: validate damos_quota_goal->nid\".\n\nnode_mem[cg]_{used,free}_bp DAMOS quota goals receive the node id.  The\nnode id is used for si_meminfo_node() and NODE_DATA() without proper\nvalidation.  As a result, privileged users can trigger an out of bounds\nmemory access using DAMON_SYSFS.  Fix the issues.\n\nThe issue was originally reported [1] with a fix by another author.  The\noriginal author announced [2] that they will stop working including the\nfix that was still in the review stage.  Hence I'm restarting this.\n\n\nThis patch (of 2):\n\nUsers can set damos_quota_goal->nid with arbitrary value for\nnode_mem_{used,free}_bp.  But DAMON core is using those for\nsi_meminfo_node() without the validation of the value.  This can result in\nout of bounds memory access.  The issue can actually triggered using DAMON\nuser-space tool (damo), like below.\n\n    $ sudo ./damo start --damos_action stat \\\n    \t--damos_quota_goal node_mem_used_bp 50% -1 \\\n    \t--damos_quota_interval 1s\n    $ sudo dmesg\n    [...]\n    [   65.565986] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098\n\nFix this issue by adding the validation of the given node.  If an invalid\nnode id is given, it returns 0% for used memory ratio, and 100% for free\nmemory ratio.","Type":"Description","Title":"mm/damon/core: validate damos_quota_goal->nid for node_mem_{used"}]}}}