{"id":"CVE-2026-43075","summary":"ocfs2: fix out-of-bounds write in ocfs2_write_end_inline","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix out-of-bounds write in ocfs2_write_end_inline\n\nKASAN reports a use-after-free write of 4086 bytes in\nocfs2_write_end_inline, called from ocfs2_write_end_nolock during a\ncopy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on\na loop device.  The actual bug is an out-of-bounds write past the inode\nblock buffer, not a true use-after-free.  The write overflows into an\nadjacent freed page, which KASAN reports as UAF.\n\nThe root cause is that ocfs2_try_to_write_inline_data trusts the on-disk\nid_count field to determine whether a write fits in inline data.  On a\ncorrupted filesystem, id_count can exceed the physical maximum inline data\ncapacity, causing writes to overflow the inode block buffer.\n\nCall trace (crash path):\n\n   vfs_copy_file_range (fs/read_write.c:1634)\n     do_splice_direct\n       splice_direct_to_actor\n         iter_file_splice_write\n           ocfs2_file_write_iter\n             generic_perform_write\n               ocfs2_write_end\n                 ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)\n                   ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)\n                     memcpy_from_folio     \u003c-- KASAN: write OOB\n\nSo add id_count upper bound check in ocfs2_validate_inode_block() to\nalongside the existing i_size check to fix it.","modified":"2026-07-15T01:49:06.060929416Z","published":"2026-05-06T07:40:03.337Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43075.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/22df7d4de9c5cd42edf855a1de25f2106088c4c6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2e6a254f9cedf51b75cc20b8b92e2209bfa04c3e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/68f9cc3bbf2ae501770cea7dc0005fc9a85e48ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/69d3c69ade1e4285ab4ca48fe7acee0767e65604"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14"},{"type":"WEB","url":"https://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43075.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43075"},{"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":"1afc32b952335f665327a1a9001ba1b44bb76fd9"},{"fixed":"68f9cc3bbf2ae501770cea7dc0005fc9a85e48ea"},{"fixed":"2e6a254f9cedf51b75cc20b8b92e2209bfa04c3e"},{"fixed":"22df7d4de9c5cd42edf855a1de25f2106088c4c6"},{"fixed":"e2c9dc6b6e96f3585f2a1062ca3374a52db0938f"},{"fixed":"947f953978b0d9463498d548d0f054f5a75be2e9"},{"fixed":"0c1af902223b6fcedb60904ca0b551254686c7b9"},{"fixed":"69d3c69ade1e4285ab4ca48fe7acee0767e65604"},{"fixed":"7bc5da4842bed3252d26e742213741a4d0ac1b14"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43075.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.24"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43075.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}