{"id":"CVE-2026-72164","summary":"ocfs2: avoid moving extents to occupied clusters","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: avoid moving extents to occupied clusters\n\nFor non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical\nme_goal.  ocfs2_move_extent() initializes new_phys_cpos from that goal and\nexpects ocfs2_probe_alloc_group() to replace it with a free run in the\ntarget block group.\n\nThe probe currently leaves *phys_cpos unchanged if the scan reaches the\nend of the group without finding a free run.  An occupied goal at the last\nbit can therefore survive the probe and be passed to\n__ocfs2_move_extent(), which copies file data into a cluster still owned\nby another inode before the bitmap is updated.\n\nWhen the probe does find a free run, it also subtracts move_len from the\nending bit.  The start of an N-bit run ending at i is i - N + 1, so the\ncurrent calculation can report the bit immediately before the free run.\n\nClear *phys_cpos before scanning and use the correct free-run start. \nCallers already treat a zero result as -ENOSPC, so failed probes no longer\ncontinue with an occupied caller-controlled goal.","modified":"2026-08-18T03:56:37.820492155Z","published":"2026-08-15T05:53:31.901Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72164.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/19f7b04924b20b81dabbeed19d5542792ba5b6d6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/22920541c35a9f23f219038ba5874c843a7c4419"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3112afebf2a76e522fbaabcbb0c47aafbdc35932"},{"type":"WEB","url":"https://git.kernel.org/stable/c/35486b291b8fbde6c4d0b1c79e565c6260d3329d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d1953d3aeb4a7f6623083e1839068ee1c157db2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5d5a21fb33cd9b963aea99da81e4dacd452cd95"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e281d892ce5870a50fdc718cb3bfc3dd5b62c728"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72164.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72164"},{"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":"e6b5859cccfa0fec02f3c5b1069481efc7186f47"},{"fixed":"3112afebf2a76e522fbaabcbb0c47aafbdc35932"},{"fixed":"35486b291b8fbde6c4d0b1c79e565c6260d3329d"},{"fixed":"19f7b04924b20b81dabbeed19d5542792ba5b6d6"},{"fixed":"e281d892ce5870a50fdc718cb3bfc3dd5b62c728"},{"fixed":"0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e"},{"fixed":"d5d5a21fb33cd9b963aea99da81e4dacd452cd95"},{"fixed":"4d1953d3aeb4a7f6623083e1839068ee1c157db2"},{"fixed":"22920541c35a9f23f219038ba5874c843a7c4419"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72164.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"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":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72164.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}