CVE-2026-68164

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But commit 97d482f4592f (\"mm/damon/sysfs: reuse\ndamon_set_regions() for regions setting\") has mistakenly removed the\nvalidation.\n\nThis can make DAMON behave in unexpected ways. At the best, the\nmonitoring results snapshot will just look weird since there will be\noverlapping regions. DAMOS will also work weirdly, applying the same\naction multiple times for overlapping regions, and make DAMOS quota weird.\nMore seriously, depending on the setup and regions updates sequence,\nnegative size regions can be made. It will trigger WARN_ONCE() if the\nkernel is built with CONFIG_DAMON_DEBUG_SANITY=y. Depending on the\nmonitoring results, the negative size region can further trigger division\nby zero in damon_merge_two_regions().\n\nNote that some of the consequences including the WARN_ONCE() and the\ndivide by zero depend on commits that were introduced after the root cause\ncommit 97d482f4592f (\"mm/damon/sysfs: reuse damon_set_regions() for\nregions setting\").\n\nFix the problems by checking the assumption and returning an error if\nthe input ranges don't meet the assumption.\n\nThe issue was discovered [1] by Sashiko."}], "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": "97d482f4592fde2322c319f07bc54f3a0d37861c", "lessThan": "a5c453fffb6f2ce75fc10b5d8bc475f1758010bd", "status": "affected", "versionType": "git"}, {"version": "97d482f4592fde2322c319f07bc54f3a0d37861c", "lessThan": "4b4a3e7ef7bb622237495db9ba4dfd7417d6530e", "status": "affected", "versionType": "git"}, {"version": "97d482f4592fde2322c319f07bc54f3a0d37861c", "lessThan": "06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd", "status": "affected", "versionType": "git"}, {"version": "97d482f4592fde2322c319f07bc54f3a0d37861c", "lessThan": "6ce0db97fb37ab8cf8596edca0e3de8618ab009a", "status": "affected", "versionType": "git"}, {"version": "97d482f4592fde2322c319f07bc54f3a0d37861c", "lessThan": "e33adf96afb5883f84b0d98747976bde293e33cb", "status": "affected", "versionType": "git"}, {"version": "97d482f4592fde2322c319f07bc54f3a0d37861c", "lessThan": "954157679ec34661c2e87e7eb796104a797c32db", "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": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.19", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a5c453fffb6f2ce75fc10b5d8bc475f1758010bd"}, {"url": "https://git.kernel.org/stable/c/4b4a3e7ef7bb622237495db9ba4dfd7417d6530e"}, {"url": "https://git.kernel.org/stable/c/06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd"}, {"url": "https://git.kernel.org/stable/c/6ce0db97fb37ab8cf8596edca0e3de8618ab009a"}, {"url": "https://git.kernel.org/stable/c/e33adf96afb5883f84b0d98747976bde293e33cb"}, {"url": "https://git.kernel.org/stable/c/954157679ec34661c2e87e7eb796104a797c32db"}], "title": "mm/damon/core: disallow overlapping input ranges for damon_set_regions()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68164", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:43:18.408895Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:44:59.784Z"}}]}}

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Hence the assumption was initially to be\nexplicitly validated. But commit 97d482f4592f (\"mm/damon/sysfs: reuse\ndamon_set_regions() for regions setting\") has mistakenly removed the\nvalidation.\n\nThis can make DAMON behave in unexpected ways. At the best, the\nmonitoring results snapshot will just look weird since there will be\noverlapping regions. DAMOS will also work weirdly, applying the same\naction multiple times for overlapping regions, and make DAMOS quota weird.\nMore seriously, depending on the setup and regions updates sequence,\nnegative size regions can be made. It will trigger WARN_ONCE() if the\nkernel is built with CONFIG_DAMON_DEBUG_SANITY=y. Depending on the\nmonitoring results, the negative size region can further trigger division\nby zero in damon_merge_two_regions().\n\nNote that some of the consequences including the WARN_ONCE() and the\ndivide by zero depend on commits that were introduced after the root cause\ncommit 97d482f4592f (\"mm/damon/sysfs: reuse damon_set_regions() for\nregions setting\").\n\nFix the problems by checking the assumption and returning an error if\nthe input ranges don't meet the assumption.\n\nThe issue was discovered [1] by Sashiko."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:30:34.916Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68164", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:44:59.784Z", "dateReserved": "2026-07-30T09:28:09.372Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T11:59:31.670Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Hence the assumption was initially to be\nexplicitly validated. But commit 97d482f4592f (\"mm/damon/sysfs: reuse\ndamon_set_regions() for regions setting\") has mistakenly removed the\nvalidation.\n\nThis can make DAMON behave in unexpected ways. At the best, the\nmonitoring results snapshot will just look weird since there will be\noverlapping regions. DAMOS will also work weirdly, applying the same\naction multiple times for overlapping regions, and make DAMOS quota weird.\nMore seriously, depending on the setup and regions updates sequence,\nnegative size regions can be made. It will trigger WARN_ONCE() if the\nkernel is built with CONFIG_DAMON_DEBUG_SANITY=y. Depending on the\nmonitoring results, the negative size region can further trigger division\nby zero in damon_merge_two_regions().\n\nNote that some of the consequences including the WARN_ONCE() and the\ndivide by zero depend on commits that were introduced after the root cause\ncommit 97d482f4592f (\"mm/damon/sysfs: reuse damon_set_regions() for\nregions setting\").\n\nFix the problems by checking the assumption and returning an error if\nthe input ranges don't meet the assumption.\n\nThe issue was discovered [1] by Sashiko."}], "id": "CVE-2026-68164", "lastModified": "2026-11-06T17:19:20.080", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68164", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:43:18.408895Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:02.840", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b4a3e7ef7bb622237495db9ba4dfd7417d6530e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6ce0db97fb37ab8cf8596edca0e3de8618ab009a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/954157679ec34661c2e87e7eb796104a797c32db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a5c453fffb6f2ce75fc10b5d8bc475f1758010bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e33adf96afb5883f84b0d98747976bde293e33cb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Division by zero in DAMON due to missing input validation in damon_set_regions()", "id": "2513281", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513281"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-369", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/damon/core: disallow overlapping input ranges for damon_set_regions()\ndamon_set_regions() assumes the input ranges are sorted by the address and\ndon't overlap each other. Hence the assumption was initially to be\nexplicitly validated. But commit 97d482f4592f (\"mm/damon/sysfs: reuse\ndamon_set_regions() for regions setting\") has mistakenly removed the\nvalidation.\nThis can make DAMON behave in unexpected ways. At the best, the\nmonitoring results snapshot will just look weird since there will be\noverlapping regions. DAMOS will also work weirdly, applying the same\naction multiple times for overlapping regions, and make DAMOS quota weird.\nMore seriously, depending on the setup and regions updates sequence,\nnegative size regions can be made. It will trigger WARN_ONCE() if the\nkernel is built with CONFIG_DAMON_DEBUG_SANITY=y. Depending on the\nmonitoring results, the negative size region can further trigger division\nby zero in damon_merge_two_regions().\nNote that some of the consequences including the WARN_ONCE() and the\ndivide by zero depend on commits that were introduced after the root cause\ncommit 97d482f4592f (\"mm/damon/sysfs: reuse damon_set_regions() for\nregions setting\").\nFix the problems by checking the assumption and returning an error if\nthe input ranges don't meet the assumption.\nThe issue was discovered [1] by Sashiko.", "A flaw was found in the Linux kernel's DAMON (Data Access MONitor) subsystem. The `damon_set_regions()` function, responsible for setting memory monitoring regions, incorrectly processes unsorted or overlapping input ranges due to a missing validation check. This can lead to unexpected behavior in DAMON and DAMOS (DAMON Operation Schemes), including incorrect monitoring results and repeated actions. More critically, it can result in the creation of negative-sized memory regions, potentially causing a division-by-zero error in `damon_merge_two_regions()`, leading to a system crash."], "name": "CVE-2026-68164", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T11:59:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68164\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68164\nhttps://git.kernel.org/stable/c/06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd\nhttps://git.kernel.org/stable/c/4b4a3e7ef7bb622237495db9ba4dfd7417d6530e\nhttps://git.kernel.org/stable/c/6ce0db97fb37ab8cf8596edca0e3de8618ab009a\nhttps://git.kernel.org/stable/c/954157679ec34661c2e87e7eb796104a797c32db\nhttps://git.kernel.org/stable/c/e33adf96afb5883f84b0d98747976bde293e33cb"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[97d482f4592fde2322c319f07bc54f3a0d37861c,4b4a3e7ef7bb622237495db9ba4dfd7417d6530e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[97d482f4592fde2322c319f07bc54f3a0d37861c,06a4beeeec8f03f0b3e9c78a98f1ae4f0f18cfbd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[97d482f4592fde2322c319f07bc54f3a0d37861c,6ce0db97fb37ab8cf8596edca0e3de8618ab009a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[97d482f4592fde2322c319f07bc54f3a0d37861c,954157679ec34661c2e87e7eb796104a797c32db)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[97d482f4592fde2322c319f07bc54f3a0d37861c,e33adf96afb5883f84b0d98747976bde293e33cb)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T14:00:08.103774+00:00", "updated": "2026-08-13T10:15:07.431371+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}