{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72105", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.906Z", "datePublished": "2026-08-15T05:52:48.099Z", "dateUpdated": "2026-10-16T15:53:21.465Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:40:19.004Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-log: fix a bitset_size overflow on 32bit machines\n\nCommit c20e36b7631d (\"dm log: fix out-of-bounds write due to\nregion_count overflow\") made sure that region_count could fit in an\nunsigned int. But the bitmap memory isn't allocated based on\nregion_count. It uses bitset_size (a size_t variable). The first step of\ncalculating bitset_size is to set it to region_count, rounded up to a\nmultiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG\nsmaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit\narchitecture, this will make bitset_size wrap around to 0 and fail,\ndespite region_count being valid.\n\nSince bitset_size gets divided by 8, it can hold any valid region_count.\nIt just needs a special case to handle the rollover. If it is 0, the\nvalue rolled over, and bitset size should be set to the number of bytes\nneeded to hold 2^32 bits." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is reached only via local Device Mapper ioctls on /dev/mapper/control (dmsetup table load creating a mirror with core/disk log); there is no network, wireless, or physical-bus receive path into create_log_context().\nAC:L - A CAP_SYS_ADMIN attacker fully controls mirror table length and region_size via dmsetup, deterministically forcing region_count into the UINT_MAX-30..UINT_MAX wrap range on 32-bit kernels without races or victim-specific heap layout.\nPR:L - DM control ioctls require CAP_SYS_ADMIN, which is obtainable inside an unprivileged user namespace per kernel CNA guidance; mirror/dm-log setup is not limited to init-namespace root on typical container-capable systems.\nUI:N - Exploitation requires only the attacker issuing dmsetup/ioctl to create or resume a mirror with crafted parameters; no separate victim action such as mounting a filesystem or opening a file is needed.\nS:U - Impact is kernel vmalloc heap corruption and privilege escalation within the host kernel; it does not cross a VM, hypervisor, or IOMMU security boundary.\nC:H - Wrapping bitset_size to zero undersizes clean_bits/sync_bits/recovering_bits versus lc->region_count near UINT_MAX; subsequent log_test_bit/__set_bit_le calls during mirror I/O perform out-of-bounds reads of adjacent vmalloc heap memory.\nI:H - The same undersized bitmap sizing lets log_set_bit and log_clear_bit write far beyond the allocated bitset via region indices derived from dm mirror bios, corrupting adjacent kernel heap objects exploitable for arbitrary write or code execution.\nA:H - Identical dm-log bitset paths (e.g., core_in_sync calling log_test_bit) have been shown to kernel-crash with CR2 faults from out-of-bounds heap access; triggering this overflow causes oops, panic, or hang on affected 32-bit storage nodes." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-log.c" ], "versions": [ { "version": "44ab8875ae4a2842bde2d756bed195d375e0debb", "lessThan": "cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5", "status": "affected", "versionType": "git" }, { "version": "defe483e47173768c227532694dc78cb65db5f09", "lessThan": "4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723", "status": "affected", "versionType": "git" }, { "version": "3ec74da927b4e171a6fc0e77b1188ba4d019af51", "lessThan": "567602fa72d57169365cbc589e0b8c3be900636d", "status": "affected", "versionType": "git" }, { "version": "d4ac87567f86a55c3c92e9a5144dcd943a9772a1", "lessThan": "d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a", "status": "affected", "versionType": "git" }, { "version": "12bd5b88e91a02785244ff1d20fb157e96e9cdc8", "lessThan": "1c3412b584e1fb6c665ff33ba7259253bc0082cb", "status": "affected", "versionType": "git" }, { "version": "b455903eed4558982be0811f5b7f44f6bbc4ff57", "lessThan": "e0b0163a65758ec3a2361ae1cea407898c27f21e", "status": "affected", "versionType": "git" }, { "version": "c20e36b7631d83e7535877f08af8b0af72c44b1a", "lessThan": "79feb87ab2396d49b9b65e4bb815d33cc71cba47", "status": "affected", "versionType": "git" }, { "version": "c20e36b7631d83e7535877f08af8b0af72c44b1a", "lessThan": "9743132a41f4d9d0e54c5f2adcb821b04796bab1", "status": "affected", "versionType": "git" }, { "version": "4ec8323b9f0764a14d532b1ae9b87f8a9fecb867", "status": "affected", "versionType": "git" }, { "version": "5.10.258", "lessThan": "5.10.261", "status": "affected", "versionType": "semver" }, { "version": "5.15.209", "lessThan": "5.15.212", "status": "affected", "versionType": "semver" }, { "version": "6.1.175", "lessThan": "6.1.178", "status": "affected", "versionType": "semver" }, { "version": "6.6.141", "lessThan": "6.6.145", "status": "affected", "versionType": "semver" }, { "version": "6.12.91", "lessThan": "6.12.97", "status": "affected", "versionType": "semver" }, { "version": "6.18.33", "lessThan": "6.18.40", "status": "affected", "versionType": "semver" }, { "version": "7.0.10", "lessThan": "7.1", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-log.c" ], "versions": [ { "version": "7.1", "status": "affected" }, { "version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.258", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.209", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.175", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.141", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.91", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.33", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5" }, { "url": "https://git.kernel.org/stable/c/4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723" }, { "url": "https://git.kernel.org/stable/c/567602fa72d57169365cbc589e0b8c3be900636d" }, { "url": "https://git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a" }, { "url": "https://git.kernel.org/stable/c/1c3412b584e1fb6c665ff33ba7259253bc0082cb" }, { "url": "https://git.kernel.org/stable/c/e0b0163a65758ec3a2361ae1cea407898c27f21e" }, { "url": "https://git.kernel.org/stable/c/79feb87ab2396d49b9b65e4bb815d33cc71cba47" }, { "url": "https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1" } ], "title": "dm-log: fix a bitset_size overflow on 32bit machines", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-72105", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:52:08.599167Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:21.465Z" } } ] } }