{"id":"CVE-2024-50278","state":"PUBLISHED","title":"dm cache: fix potential out-of-bounds access on the first resume","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix potential out-of-bounds access on the first resume\n\nOut-of-bounds access occurs if the fast device is expanded unexpectedly\nbefore the first-time resume of the cache table. This happens because\nexpanding the fast device requires reloading the cache table for\ncache_create to allocate new in-core data structures that fit the new\nsize, and the check in cache_preresume is not performed during the\nfirst resume, leading to the issue.\n\nReproduce steps:\n\n1. prepare component devices:\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\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\n\n2. load a cache table of 512 cache blocks, and deliberately expand the\n   fast device before resuming the cache, making the in-core data\n   structures inadequate.\n\ndmsetup create cache --notable\ndmsetup reload cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\ndmsetup reload cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup resume cdata\ndmsetup resume cache\n\n3. suspend the cache to write out the in-core dirty bitset and hint\n   array, leading to out-of-bounds access to the dirty bitset at offset\n   0x40:\n\ndmsetup suspend cache\n\nKASAN reports:\n\n  BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80\n  Read of size 8 at addr ffffc90000085040 by task dmsetup/90\n\n  (...snip...)\n  The buggy address belongs to the virtual mapping at\n   [ffffc90000085000, ffffc90000087000) created by:\n   cache_ctr+0x176a/0x35f0\n\n  (...snip...)\n  Memory state around the buggy address:\n   ffffc90000084f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc90000084f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n  >ffffc90000085000: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8\n                                             ^\n   ffffc90000085080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc90000085100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n\nFix by checking the size change on the first resume.","publishedAt":"2024-11-19T01:30:19.352Z","updatedAt":"2026-05-11T20:49:02.005Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"e492f71854ce03474d49e87fd98b8df1f7cd1d2d","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"2222b0929d00e2d13732b799b63be391b5de4492","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"483b7261b35a9d369082ab298a6670912243f0be","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"fdef3b94dfebd57e3077a578b6e309a2bb6fa688","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"c52ec00cb2f9bebfada22edcc0db385b910a1cdb","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"036dd6e3d2638103e0092864577ea1d091466b86","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"13ed3624c6ef283acefa4cc42cc8ae54fd4391a4","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"c0ade5d98979585d4f5a93e4514c2e9a65afa08d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-cache-target.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"4.19.324","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.286","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.230","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.172","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.117","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.61","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.11.8","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-cache-target.c"]}],"references":["https://git.kernel.org/stable/c/e492f71854ce03474d49e87fd98b8df1f7cd1d2d","https://git.kernel.org/stable/c/2222b0929d00e2d13732b799b63be391b5de4492","https://git.kernel.org/stable/c/483b7261b35a9d369082ab298a6670912243f0be","https://git.kernel.org/stable/c/fdef3b94dfebd57e3077a578b6e309a2bb6fa688","https://git.kernel.org/stable/c/c52ec00cb2f9bebfada22edcc0db385b910a1cdb","https://git.kernel.org/stable/c/036dd6e3d2638103e0092864577ea1d091466b86","https://git.kernel.org/stable/c/13ed3624c6ef283acefa4cc42cc8ae54fd4391a4","https://git.kernel.org/stable/c/c0ade5d98979585d4f5a93e4514c2e9a65afa08d","https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:07:56.516Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/50xxx/CVE-2024-50278.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-50278","state":"PUBLISHED","datePublished":"2024-11-19T01:30:19.352Z","dateUpdated":"2026-05-11T20:49:02.005Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-10-21T19:36:19.983Z"},"containers":{"cna":{"title":"dm cache: fix potential out-of-bounds access on the first resume","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix potential out-of-bounds access on the first resume\n\nOut-of-bounds access occurs if the fast device is expanded unexpectedly\nbefore the first-time resume of the cache table. This happens because\nexpanding the fast device requires reloading the cache table for\ncache_create to allocate new in-core data structures that fit the new\nsize, and the check in cache_preresume is not performed during the\nfirst resume, leading to the issue.\n\nReproduce steps:\n\n1. prepare component devices:\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\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\n\n2. load a cache table of 512 cache blocks, and deliberately expand the\n   fast device before resuming the cache, making the in-core data\n   structures inadequate.\n\ndmsetup create cache --notable\ndmsetup reload cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\ndmsetup reload cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup resume cdata\ndmsetup resume cache\n\n3. suspend the cache to write out the in-core dirty bitset and hint\n   array, leading to out-of-bounds access to the dirty bitset at offset\n   0x40:\n\ndmsetup suspend cache\n\nKASAN reports:\n\n  BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80\n  Read of size 8 at addr ffffc90000085040 by task dmsetup/90\n\n  (...snip...)\n  The buggy address belongs to the virtual mapping at\n   [ffffc90000085000, ffffc90000087000) created by:\n   cache_ctr+0x176a/0x35f0\n\n  (...snip...)\n  Memory state around the buggy address:\n   ffffc90000084f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc90000084f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n  >ffffc90000085000: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8\n                                             ^\n   ffffc90000085080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc90000085100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n\nFix by checking the size change on the first resume."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"e492f71854ce03474d49e87fd98b8df1f7cd1d2d","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"2222b0929d00e2d13732b799b63be391b5de4492","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"483b7261b35a9d369082ab298a6670912243f0be","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"fdef3b94dfebd57e3077a578b6e309a2bb6fa688","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"c52ec00cb2f9bebfada22edcc0db385b910a1cdb","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"036dd6e3d2638103e0092864577ea1d091466b86","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"13ed3624c6ef283acefa4cc42cc8ae54fd4391a4","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"c0ade5d98979585d4f5a93e4514c2e9a65afa08d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-cache-target.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"4.19.324","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.286","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.230","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.172","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.117","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.61","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.11.8","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-cache-target.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e492f71854ce03474d49e87fd98b8df1f7cd1d2d"},{"url":"https://git.kernel.org/stable/c/2222b0929d00e2d13732b799b63be391b5de4492"},{"url":"https://git.kernel.org/stable/c/483b7261b35a9d369082ab298a6670912243f0be"},{"url":"https://git.kernel.org/stable/c/fdef3b94dfebd57e3077a578b6e309a2bb6fa688"},{"url":"https://git.kernel.org/stable/c/c52ec00cb2f9bebfada22edcc0db385b910a1cdb"},{"url":"https://git.kernel.org/stable/c/036dd6e3d2638103e0092864577ea1d091466b86"},{"url":"https://git.kernel.org/stable/c/13ed3624c6ef283acefa4cc42cc8ae54fd4391a4"},{"url":"https://git.kernel.org/stable/c/c0ade5d98979585d4f5a93e4514c2e9a65afa08d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:49:02.005Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"4.19.324"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.4.286"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.230"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.172"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.11.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.1,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2024-50278","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T20:14:46.745309Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","type":"CWE","description":"CWE-125 Out-of-bounds Read"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T20:17:22.503Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T22:27:56.948Z"}}]}}}