CVE-2026-53189

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If folio_put() drops the last\nreference, mm_counter_file() can later read freed folio state via\nfolio_test_swapbacked().\n\nMove the counter update before folio_put()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Reachable by a local process through ordinary memory-management paths such as page fault creation of a file/shmem huge PMD followed by mprotect/munmap/mremap-style PMD splitting. No network, adjacent, or physical input path reaches this core MM helper.\nAC:L - An attacker can create suitable file/shmem THP mappings and trigger PMD splits from their own process; any last-reference/race condition can be driven with attacker-controlled local threads and file operations. Under the uncertainty rule, this is Low complexity.\nPR:L - The path requires only an unprivileged local user able to mmap and modify protections or mappings of their own file/tmpfs memory. No real root or init-namespace capability gate is required.\nUI:N - Exploitation does not require another user to take action. The local attacker can set up the mapping and trigger the split themselves.\nS:U - The vulnerable code is in the kernel MM subsystem and impacts kernel-managed resources within the same security authority. It is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a use-after-free read of folio state after the PMD mapping reference may be dropped. Following kernel UAF guidance and the higher-severity rule, this is treated as potentially enabling high confidentiality impact.\nI:H - The stale freed folio state controls which RSS counter is updated and represents UAF-driven kernel memory/accounting corruption in core MM. Following the UAF guidance and higher-severity rule, integrity impact is High.\nA:H - A UAF in the huge PMD split path can corrupt kernel MM state and can plausibly lead to warnings, oopses, or crashes when repeatedly triggered. Kernel UAF availability impact is therefore High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/huge_memory.c"], "versions": [{"version": "fadae2953072e9005c5f1d64e1049edb043494dc", "lessThan": "84b3212b166b446faea27ebebb7161405ffceef9", "status": "affected", "versionType": "git"}, {"version": "fadae2953072e9005c5f1d64e1049edb043494dc", "lessThan": "108963978a681c0c468d279cac2b930c27672877", "status": "affected", "versionType": "git"}, {"version": "fadae2953072e9005c5f1d64e1049edb043494dc", "lessThan": "459771c9cf30f378bdbd30fc65d17f7eb931bb59", "status": "affected", "versionType": "git"}, {"version": "fadae2953072e9005c5f1d64e1049edb043494dc", "lessThan": "ae9d4caf6f133e884cf5fcda4982c493b35e5194", "status": "affected", "versionType": "git"}, {"version": "fadae2953072e9005c5f1d64e1049edb043494dc", "lessThan": 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No network, adjacent, or physical input path reaches this core MM helper.\nAC:L - An attacker can create suitable file/shmem THP mappings and trigger PMD splits from their own process; any last-reference/race condition can be driven with attacker-controlled local threads and file operations. Under the uncertainty rule, this is Low complexity.\nPR:L - The path requires only an unprivileged local user able to mmap and modify protections or mappings of their own file/tmpfs memory. No real root or init-namespace capability gate is required.\nUI:N - Exploitation does not require another user to take action. The local attacker can set up the mapping and trigger the split themselves.\nS:U - The vulnerable code is in the kernel MM subsystem and impacts kernel-managed resources within the same security authority. It is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a use-after-free read of folio state after the PMD mapping reference may be dropped. Following kernel UAF guidance and the higher-severity rule, this is treated as potentially enabling high confidentiality impact.\nI:H - The stale freed folio state controls which RSS counter is updated and represents UAF-driven kernel memory/accounting corruption in core MM. Following the UAF guidance and higher-severity rule, integrity impact is High.\nA:H - A UAF in the huge PMD split path can corrupt kernel MM state and can plausibly lead to warnings, oopses, or crashes when repeatedly triggered. 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If folio_put() drops the last\nreference, mm_counter_file() can later read freed folio state via\nfolio_test_swapbacked().\n\nMove the counter update before folio_put()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.94", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "4.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:56.458Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53189", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:57:27.480Z", "dateReserved": "2026-06-09T07:44:35.390Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-25T08:39:01.708Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/huge_memory: update file PMD counter before folio_put()\n\n__split_huge_pmd_locked() updates the file/shmem RSS counter after\ndropping the PMD mapping's folio reference. If folio_put() drops the last\nreference, mm_counter_file() can later read freed folio state via\nfolio_test_swapbacked().\n\nMove the counter update before folio_put()."}], "id": "CVE-2026-53189", "lastModified": "2026-10-19T20:19:07.837", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53189", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:26:30.336469Z", "version": "2.0.3"}}]}, "published": "2026-06-25T09:16:36.327", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/108963978a681c0c468d279cac2b930c27672877"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/459771c9cf30f378bdbd30fc65d17f7eb931bb59"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f5b604e1e6bde4e889199168ee80fe8306d06ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c29a8ba084e89499ca77b947e07ae817f9c16ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/84b3212b166b446faea27ebebb7161405ffceef9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d878059924f12c1bc24556a92ec56add74de3c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae9d4caf6f133e884cf5fcda4982c493b35e5194"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed5b030931292c94133437ac5e5ff580e498eabd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: mm/huge_memory: update file PMD counter before folio_put()", "id": "2492788", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492788"}, "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"}, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's memory management, specifically within the huge page mechanism. When a huge page is split, the system updates a counter after releasing a reference to the memory. This timing issue can lead to the system attempting to read from memory that has already been freed, potentially resulting in memory corruption or information disclosure."], "name": "CVE-2026-53189", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53189\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53189\nhttps://lore.kernel.org/linux-cve-announce/2026062557-CVE-2026-53189-1b4a@gregkh/T"], "threat_severity": "Moderate"}

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