{"id":"CVE-2024-50279","state":"PUBLISHED","title":"dm cache: fix out-of-bounds access to the dirty bitset when resizing","description":"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.","publishedAt":"2024-11-19T01:30:20.712Z","updatedAt":"2026-05-11T20:49:03.406Z","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":"4fa4feb873cea0e9d6ff883b37cca6f33169d8b4","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"8501e38dc9e0060814c4085815fc83da3e6d43bf","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"ee1f74925717ab36f6a091104c170639501ce818","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"56507203e1b6127967ec2b51fb0b23a0d4af1334","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"e57648ce325fa405fe6bbd0e6a618ced7c301a2d","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"3b02c40ff10fdf83cc545850db208de855ebe22c","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"792227719725497ce10a8039803bec13f89f8910","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/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4","https://git.kernel.org/stable/c/8501e38dc9e0060814c4085815fc83da3e6d43bf","https://git.kernel.org/stable/c/ee1f74925717ab36f6a091104c170639501ce818","https://git.kernel.org/stable/c/ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f","https://git.kernel.org/stable/c/56507203e1b6127967ec2b51fb0b23a0d4af1334","https://git.kernel.org/stable/c/e57648ce325fa405fe6bbd0e6a618ced7c301a2d","https://git.kernel.org/stable/c/3b02c40ff10fdf83cc545850db208de855ebe22c","https://git.kernel.org/stable/c/792227719725497ce10a8039803bec13f89f8910","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-2024-50279.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-50279","state":"PUBLISHED","datePublished":"2024-11-19T01:30:20.712Z","dateUpdated":"2026-05-11T20:49:03.406Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-10-21T19:36:19.983Z"},"containers":{"cna":{"title":"dm cache: fix out-of-bounds access to the dirty bitset when resizing","descriptions":[{"lang":"en","value":"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","lessThan":"4fa4feb873cea0e9d6ff883b37cca6f33169d8b4","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"8501e38dc9e0060814c4085815fc83da3e6d43bf","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"ee1f74925717ab36f6a091104c170639501ce818","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"56507203e1b6127967ec2b51fb0b23a0d4af1334","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"e57648ce325fa405fe6bbd0e6a618ced7c301a2d","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"3b02c40ff10fdf83cc545850db208de855ebe22c","versionType":"git"},{"version":"f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498","status":"affected","lessThan":"792227719725497ce10a8039803bec13f89f8910","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/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4"},{"url":"https://git.kernel.org/stable/c/8501e38dc9e0060814c4085815fc83da3e6d43bf"},{"url":"https://git.kernel.org/stable/c/ee1f74925717ab36f6a091104c170639501ce818"},{"url":"https://git.kernel.org/stable/c/ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f"},{"url":"https://git.kernel.org/stable/c/56507203e1b6127967ec2b51fb0b23a0d4af1334"},{"url":"https://git.kernel.org/stable/c/e57648ce325fa405fe6bbd0e6a618ced7c301a2d"},{"url":"https://git.kernel.org/stable/c/3b02c40ff10fdf83cc545850db208de855ebe22c"},{"url":"https://git.kernel.org/stable/c/792227719725497ce10a8039803bec13f89f8910"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:49:03.406Z"},"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-2024-50279","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T20:14:43.545051Z"}}}],"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":"2025-10-01T20:17:22.379Z"}},{"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":"2025-11-03T22:27:58.416Z"}}]}}}