{"id":"CVE-2026-72470","title":"fs/ntfs3: resize log->one_page_buf when adopting on-disk page size","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 220a6ef5e89a11ffd5e490046b86dc9fb6da0e4b","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < f1422df595d69b997d23a8f11e12c528ccef7fad","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 4f129fc6f756f8541e5bff45b1804cc11b1ec712","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < c99444f6dfca893f6d310aae4a53c620f98f7b4f","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 5a35454179fe1041d9cd286f5d320ce0d448c12a","Linux 5.15"],"published":"2026-08-15","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:29:28.441Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72470","references":[{"url":"https://git.kernel.org/stable/c/220a6ef5e89a11ffd5e490046b86dc9fb6da0e4b"},{"url":"https://git.kernel.org/stable/c/2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374"},{"url":"https://git.kernel.org/stable/c/f1422df595d69b997d23a8f11e12c528ccef7fad"},{"url":"https://git.kernel.org/stable/c/4f129fc6f756f8541e5bff45b1804cc11b1ec712"},{"url":"https://git.kernel.org/stable/c/c99444f6dfca893f6d310aae4a53c620f98f7b4f"},{"url":"https://git.kernel.org/stable/c/5a35454179fe1041d9cd286f5d320ce0d448c12a"}],"tags":["cve.org"],"epss":0.00176,"epssPercentile":0.07117,"ingestedAt":"2026-11-05T15:02:32.527Z","slug":"CVE-2026-72470","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 220a6ef5e89a11ffd5e490046b86dc9fb6da0e4b`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < f1422df595d69b997d23a8f11e12c528ccef7fad`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 4f129fc6f756f8541e5bff45b1804cc11b1ec712`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < c99444f6dfca893f6d310aae4a53c620f98f7b4f`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 5a35454179fe1041d9cd286f5d320ce0d448c12a`\n- `Linux 5.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}