CVE-2026-53061

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The dirty mapping check for passthrough mode was designed\naround this assumption and is performed during table creation, causing\nthe check to fail with preload while metadata updates are ongoing. This\nrisks loading dirty mappings into passthrough mode, resulting in data\nloss.\n\nReproduce steps:\n\n1. Create a writeback cache with zero migration_threshold to produce\n dirty mappings\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 262144 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writeback smq \\\n2 migration_threshold 0\"\n\n2. Preload a table in passthrough mode\n\ndmsetup reload cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\"\n\n3. Write to the first cache block to make it dirty\n\nfio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\\n--direct=1 --size=64k\n\n4. Resume the inactive table. Now it's possible to load the dirty block\n into passthrough mode.\n\ndmsetup resume cache\n\nFix by moving the checks to the preresume phase to support table\npreloading. Also remove the unused function dm_cache_metadata_all_clean."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm-cache-metadata.c", "drivers/md/dm-cache-metadata.h", "drivers/md/dm-cache-target.c"], "versions": [{"version": "2ee57d587357f0d752af6c2e3e46434a74b1bee3", "lessThan": "c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d", "status": "affected", "versionType": "git"}, {"version": "2ee57d587357f0d752af6c2e3e46434a74b1bee3", "lessThan": "5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc", "status": "affected", "versionType": "git"}, {"version": "2ee57d587357f0d752af6c2e3e46434a74b1bee3", "lessThan": "1443c32f24d6d8bcdf4beceef2afc09290b98717", "status": "affected", "versionType": "git"}, {"version": "2ee57d587357f0d752af6c2e3e46434a74b1bee3", "lessThan": "12105c7f18375d7615dad7605d89eadae7eb12a6", "status": "affected", "versionType": "git"}, {"version": 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The dirty mapping check for passthrough mode was designed\naround this assumption and is performed during table creation, causing\nthe check to fail with preload while metadata updates are ongoing. This\nrisks loading dirty mappings into passthrough mode, resulting in data\nloss.\n\nReproduce steps:\n\n1. Create a writeback cache with zero migration_threshold to produce\n dirty mappings\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 262144 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writeback smq \\\n2 migration_threshold 0\"\n\n2. Preload a table in passthrough mode\n\ndmsetup reload cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\"\n\n3. Write to the first cache block to make it dirty\n\nfio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\\n--direct=1 --size=64k\n\n4. Resume the inactive table. Now it's possible to load the dirty block\n into passthrough mode.\n\ndmsetup resume cache\n\nFix by moving the checks to the preresume phase to support table\npreloading. 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The dirty mapping check for passthrough mode was designed\naround this assumption and is performed during table creation, causing\nthe check to fail with preload while metadata updates are ongoing. This\nrisks loading dirty mappings into passthrough mode, resulting in data\nloss.\n\nReproduce steps:\n\n1. Create a writeback cache with zero migration_threshold to produce\n dirty mappings\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 262144 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writeback smq \\\n2 migration_threshold 0\"\n\n2. Preload a table in passthrough mode\n\ndmsetup reload cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\"\n\n3. Write to the first cache block to make it dirty\n\nfio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\\n--direct=1 --size=64k\n\n4. Resume the inactive table. Now it's possible to load the dirty block\n into passthrough mode.\n\ndmsetup resume cache\n\nFix by moving the checks to the preresume phase to support table\npreloading. Also remove the unused function dm_cache_metadata_all_clean."}], "id": "CVE-2026-53061", "lastModified": "2026-11-06T17:18:04.060", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53061", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:17:30.464764Z", "version": "2.0.3"}}]}, "published": "2026-06-24T17:17:18.880", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01b22656d8a68dbeae59f8b80866e7b11936b20a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/12105c7f18375d7615dad7605d89eadae7eb12a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1443c32f24d6d8bcdf4beceef2afc09290b98717"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/21c503d60a257e54ca3ac58e2721bd24501d5bde"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd5a2c1018938e6b32670728bdb32a3f0efff00f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm cache: fix dirty mapping checking in passthrough mode switching", "id": "2492453", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492453"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's device-mapper (dm) cache component. This vulnerability arises from an incorrect assumption that table reloads only occur after suspension, which is violated by Logical Volume Manager (LVM) table preloading. The dirty mapping check for passthrough mode, performed during table creation, fails when metadata updates are ongoing due to preloading. This can lead to dirty mappings being loaded into passthrough mode, potentially resulting in data loss."], "name": "CVE-2026-53061", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53061\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53061\nhttps://lore.kernel.org/linux-cve-announce/2026062402-CVE-2026-53061-6145@gregkh/T"], "threat_severity": "Moderate"}

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