{ "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-2024-50279", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-50279", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-11-19T01:30:20.712Z", "updatedAt": "2026-05-11T20:49:03.406Z", "importedAt": "2026-10-24T01:57:20.494Z", "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: fix out-of-bounds access to the dirty bitset when resizing", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix out-of-bounds access to the dirty bitset when resizing\n\ndm-cache checks the dirty bits of the cache blocks to be dropped when\nshrinking the fast device, but an index bug in bitset iteration causes\nout-of-bounds access.\n\nReproduce steps:\n\n1. create a cache device of 1024 cache blocks (128 bytes dirty bitset)\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 524288 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\n2. shrink the fast device to 512 cache blocks, triggering out-of-bounds\n access to the dirty bitset (offset 0x80)\n\ndmsetup suspend cache\ndmsetup reload cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup resume cdata\ndmsetup resume cache\n\nKASAN reports:\n\n BUG: KASAN: vmalloc-out-of-bounds in cache_preresume+0x269/0x7b0\n Read of size 8 at addr ffffc900000f3080 by task dmsetup/131\n\n (...snip...)\n The buggy address belongs to the virtual mapping at\n [ffffc900000f3000, ffffc900000f5000) created by:\n cache_ctr+0x176a/0x35f0\n\n (...snip...)\n Memory state around the buggy address:\n ffffc900000f2f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ffffc900000f3000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ffffc900000f3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ^\n ffffc900000f3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ffffc900000f3180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n\nFix by making the index post-incremented.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "4fa4feb873cea0e9d6ff883b37cca6f33169d8b4" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "8501e38dc9e0060814c4085815fc83da3e6d43bf" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "ee1f74925717ab36f6a091104c170639501ce818" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "56507203e1b6127967ec2b51fb0b23a0d4af1334" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "e57648ce325fa405fe6bbd0e6a618ced7c301a2d" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "3b02c40ff10fdf83cc545850db208de855ebe22c" }, { "version": "f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498", "status": "affected", "versionType": "git", "lessThan": "792227719725497ce10a8039803bec13f89f8910" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.13" }, { "version": "4.19.324", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.286", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.230", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.172", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.117", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.61", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.11.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.11.*" }, { "version": "6.12", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }