{"id":"CVE-2026-72470","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72470","summary":"fs/ntfs3: resize log->one_page_buf when adopting on-disk page size","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: resize log->one_page_buf when adopting on-disk page size\n\nlog_replay() allocates log->one_page_buf using the page size that was\nchosen from the host PAGE_SIZE:\n\n\tlog->one_page_buf = kmalloc(log->page_size, GFP_NOFS);\n\nLater, when a restart area is found, the log page size recorded on disk\nis adopted:\n\n\tt32 = le32_to_cpu(log->rst_info.r_page->sys_page_size);\n\tif (log->page_size != t32) {\n\t\tlog->l_size = log->orig_file_size;\n\t\tlog->page_size = norm_file_page(t32, &log->l_size,\n\t\t\t\t\t\tt32 == DefaultLogPageSize);\n\t}\n\nIf the on-disk page size is larger than the size used for the initial\nallocation, log->page_size grows but one_page_buf is left at its\noriginal, smaller size. A subsequent unaligned read_log_page() then\nreads log->page_size bytes into the undersized scratch buffer:\n\n\tpage_buf = page_off ? log->one_page_buf : *buffer;\n\terr = ntfs_read_run_nb_ra(ni->mi.sbi, &ni->file.run, page_vbo, page_buf,\n\t\t\t\t  log->page_size, NULL, &log->read_ahead);\n\noverflowing the allocation. This is reachable when mounting a dirty\nNTFS volume whose log was formatted with a page size larger than the\nbuffer initially allocated on the mounting host (for example a 64K-log\nvolume mounted on a host that allocated a 4K scratch buffer).\n\nGrow one_page_buf when the adopted on-disk page size exceeds the size\nused for the initial allocation. On krealloc() failure the original\nbuffer is left intact and freed by the existing error path.","published":"2026-08-15T05:57:12.472Z","modified":"2026-08-16T03:48:48.321911722Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.145"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4f129fc6f756f8541e5bff45b1804cc11b1ec712"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5a35454179fe1041d9cd286f5d320ce0d448c12a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c99444f6dfca893f6d310aae4a53c620f98f7b4f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1422df595d69b997d23a8f11e12c528ccef7fad"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72470.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72470"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-16T03:48:48.321911722Z"}}