{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40218", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.179Z", "datePublished": "2025-12-04T14:50:41.873Z", "dateUpdated": "2025-12-04T14:50:41.873Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-04T14:50:41.873Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/vaddr: do not repeat pte_offset_map_lock() until success\n\nDAMON's virtual address space operation set implementation (vaddr) calls\npte_offset_map_lock() inside the page table walk callback function. This\nis for reading and writing page table accessed bits. If\npte_offset_map_lock() fails, it retries by returning the page table walk\ncallback function with ACTION_AGAIN.\n\npte_offset_map_lock() can continuously fail if the target is a pmd\nmigration entry, though. Hence it could cause an infinite page table walk\nif the migration cannot be done until the page table walk is finished. \nThis indeed caused a soft lockup when CPU hotplugging and DAMON were\nrunning in parallel.\n\nAvoid the infinite loop by simply not retrying the page table walk. DAMON\nis promising only a best-effort accuracy, so missing access to such pages\nis no problem."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/vaddr.c"], "versions": [{"version": "7780d04046a2288ab85d88bedacc60fa4fad9971", "lessThan": "677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf", "status": "affected", "versionType": "git"}, {"version": "7780d04046a2288ab85d88bedacc60fa4fad9971", "lessThan": "ac42320ec873bfe726141069cfdd90ee5bc4e885", "status": "affected", "versionType": "git"}, {"version": "7780d04046a2288ab85d88bedacc60fa4fad9971", "lessThan": "0ccd91cf749536d41307a07e60ec14ab0dbf21f5", "status": "affected", "versionType": "git"}, {"version": "7780d04046a2288ab85d88bedacc60fa4fad9971", "lessThan": "b93af2cc8e036754c0d9970d9ddc47f43cc94b9f", "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/vaddr.c"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.113", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.54", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.4", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.5", "versionEndExcluding": "6.6.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.17.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf"}, {"url": "https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885"}, {"url": "https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5"}, {"url": "https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f"}], "title": "mm/damon/vaddr: do not repeat pte_offset_map_lock() until success", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/vaddr: do not repeat pte_offset_map_lock() until success\n\nDAMON's virtual address space operation set implementation (vaddr) calls\npte_offset_map_lock() inside the page table walk callback function. This\nis for reading and writing page table accessed bits. If\npte_offset_map_lock() fails, it retries by returning the page table walk\ncallback function with ACTION_AGAIN.\n\npte_offset_map_lock() can continuously fail if the target is a pmd\nmigration entry, though. Hence it could cause an infinite page table walk\nif the migration cannot be done until the page table walk is finished. \nThis indeed caused a soft lockup when CPU hotplugging and DAMON were\nrunning in parallel.\n\nAvoid the infinite loop by simply not retrying the page table walk. DAMON\nis promising only a best-effort accuracy, so missing access to such pages\nis no problem."}], "id": "CVE-2025-40218", "lastModified": "2025-12-04T17:15:08.283", "metrics": {}, "published": "2025-12-04T15:15:57.643", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success", "id": "2418803", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418803"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/damon/vaddr: do not repeat pte_offset_map_lock() until success\nDAMON's virtual address space operation set implementation (vaddr) calls\npte_offset_map_lock() inside the page table walk callback function. This\nis for reading and writing page table accessed bits. If\npte_offset_map_lock() fails, it retries by returning the page table walk\ncallback function with ACTION_AGAIN.\npte_offset_map_lock() can continuously fail if the target is a pmd\nmigration entry, though. Hence it could cause an infinite page table walk\nif the migration cannot be done until the page table walk is finished. \nThis indeed caused a soft lockup when CPU hotplugging and DAMON were\nrunning in parallel.\nAvoid the infinite loop by simply not retrying the page table walk. DAMON\nis promising only a best-effort accuracy, so missing access to such pages\nis no problem."], "name": "CVE-2025-40218", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40218\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40218\nhttps://lore.kernel.org/linux-cve-announce/2025120452-CVE-2025-40218-d4dc@gregkh/T"], "threat_severity": "Moderate"}