CVE-2026-46020

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46020", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.092Z", "datePublished": "2026-05-27T12:56:21.920Z", "dateUpdated": "2026-06-14T17:48:26.041Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-14T17:48:26.041Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/core.c"], "versions": [{"version": "0e1c773b501f33437d87b72c7d26080361e224b1", "lessThan": "b09958e235f2b9cd3898b85a8529172afa80d212", "status": "affected", "versionType": "git"}, {"version": "0e1c773b501f33437d87b72c7d26080361e224b1", "lessThan": "bcad74078708f2330a45b55358ebc38f8f4b1127", "status": "affected", "versionType": "git"}, {"version": "0e1c773b501f33437d87b72c7d26080361e224b1", "lessThan": "40250b2dded0604a112be605f3828700d80ad7c2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/core.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "24BD5AA7-843C-41A3-8471-F53AD6DB7C6B", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-46020", "lastModified": "2026-06-17T10:52:54.690", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-27T14:17:20.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp", "id": "2481907", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481907"}, "csaw": false, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's DAMON (Data Access MONitor) core. A privileged local user can exploit this vulnerability by providing an invalid node ID to `damos_quota_goal->nid` for `node_mem_{used,free}_bp` via the DAMON user-space tool. This improper validation can lead to an out-of-bounds memory access, potentially causing a kernel NULL pointer dereference and system instability."], "name": "CVE-2026-46020", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46020\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46020\nhttps://lore.kernel.org/linux-cve-announce/2026052746-CVE-2026-46020-3827@gregkh/T"]}

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