{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-38066", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-38066", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-06-18T09:33:44.877Z", "updatedAt": "2026-05-11T21:20:36.681Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "dm cache: prevent BUG_ON by blocking retries on failed device resumes", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: prevent BUG_ON by blocking retries on failed device resumes\n\nA cache device failing to resume due to mapping errors should not be\nretried, as the failure leaves a partially initialized policy object.\nRepeating the resume operation risks triggering BUG_ON when reloading\ncache mappings into the incomplete policy object.\n\nReproduce steps:\n\n1. create a cache metadata consisting of 512 or more cache blocks,\n with some mappings stored in the first array block of the mapping\n array. Here we use cache_restore v1.0 to build the metadata.\n\ncat <> cmeta.xml\n\n \n \n \n\nEOF\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ncache_restore -i cmeta.xml -o /dev/mapper/cmeta --metadata-version=2\ndmsetup remove cmeta\n\n2. wipe the second array block of the mapping array to simulate\n data degradations.\n\nmapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \\\n2>/dev/null | hexdump -e '1/8 \"%u\\n\"')\nablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \\\n2>/dev/null | hexdump -e '1/8 \"%u\\n\"')\ndd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock\n\n3. try bringing up the cache device. The resume is expected to fail\n due to the broken array block.\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 524288 linear /dev/sdc 262144\"\ndmsetup create cache --notable\ndmsetup load cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\ndmsetup resume cache\n\n4. try resuming the cache again. An unexpected BUG_ON is triggered\n while loading cache mappings.\n\ndmsetup resume cache\n\nKernel logs:\n\n(snip)\n------------[ cut here ]------------\nkernel BUG at drivers/md/dm-cache-policy-smq.c:752!\nOops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 332 Comm: dmsetup Not tainted 6.13.4 #3\nRIP: 0010:smq_load_mapping+0x3e5/0x570\n\nFix by disallowing resume operations for devices that failed the\ninitial attempt.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "c614584c2a66b538f469089ac089457a34590c14" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "c5356a5e80442131e2714d0d26bb110590e4e568" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "025c8f477625eb39006ded650e7d027bcfb20e79" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "00586b78eeb7c626a14ca13453a1631f88a7cf36" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "3986ef4a9b6a0d9c28bc325d8713beba5e67586f" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "cc80a5cc520939d0a7d071cc4ae4b3c55ef171d0" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "f3128e3074e8af565cc6a66fe3384a56df87f803" }, { "version": "66a636356647a9be8885c2ce2948de126577698a", "status": "affected", "versionType": "git", "lessThan": "5da692e2262b8f81993baa9592f57d12c2703dea" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.2" }, { "version": "5.4.294", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.238", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.185", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.141", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.93", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.31", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.14.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.14.*" }, { "version": "6.15", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }