{"id":"CVE-2026-72105","summary":"dm-log: fix a bitset_size overflow on 32bit machines","details":"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.","modified":"2026-10-28T02:30:50.307909536Z","published":"2026-08-15T05:52:48.099Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72105.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1c3412b584e1fb6c665ff33ba7259253bc0082cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723"},{"type":"WEB","url":"https://git.kernel.org/stable/c/567602fa72d57169365cbc589e0b8c3be900636d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79feb87ab2396d49b9b65e4bb815d33cc71cba47"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0b0163a65758ec3a2361ae1cea407898c27f21e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72105.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72105"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"44ab8875ae4a2842bde2d756bed195d375e0debb"},{"fixed":"cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"defe483e47173768c227532694dc78cb65db5f09"},{"fixed":"4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3ec74da927b4e171a6fc0e77b1188ba4d019af51"},{"fixed":"567602fa72d57169365cbc589e0b8c3be900636d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d4ac87567f86a55c3c92e9a5144dcd943a9772a1"},{"fixed":"d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"12bd5b88e91a02785244ff1d20fb157e96e9cdc8"},{"fixed":"1c3412b584e1fb6c665ff33ba7259253bc0082cb"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b455903eed4558982be0811f5b7f44f6bbc4ff57"},{"fixed":"e0b0163a65758ec3a2361ae1cea407898c27f21e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c20e36b7631d83e7535877f08af8b0af72c44b1a"},{"fixed":"79feb87ab2396d49b9b65e4bb815d33cc71cba47"},{"fixed":"9743132a41f4d9d0e54c5f2adcb821b04796bab1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.258"},{"fixed":"5.10.261"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.209"},{"fixed":"5.15.212"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.175"},{"fixed":"6.1.178"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.141"},{"fixed":"6.6.145"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.91"},{"fixed":"6.12.97"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.33"},{"fixed":"6.18.40"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7.0.10"},{"fixed":"7.1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4ec8323b9f0764a14d532b1ae9b87f8a9fecb867"}]}],"versions":["v5.10.260","v5.10.259","v5.10.258","v5.15.211","v5.15.210","v5.15.209","v6.1.177","v6.1.176","v6.1.175","v6.6.144","v6.6.143","v6.6.142","v6.6.141","v6.12.96","v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.18.39","v6.18.38","v6.18.37","v6.18.36","v6.18.35","v6.18.34","v6.18.33","v7.0.14","v7.0.13","v7.0.12","v7.0.11","v7.0.10"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72105.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed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