{"id":"CVE-2026-72105","aliases":[],"url":"https://o3.security/vulnerability/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.","published":"2026-08-15T05:52:48.099Z","modified":"2026-08-18T03:56:20.413338682Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.261"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:20.413338682Z"}}