{ "affected": [ { "ranges": [ { "events": [ { "introduced": "6f70fa519976a379d72781d927cf8e5f5b05ec86" }, { "fixed": "123c050eb96aae0bab74c9f06c6ad3de7992722b" }, { "fixed": "71f07b7f90b3109c9098d1b9c8efbbeece5deb8a" }, { "fixed": "09e93a60e18e83a630ff84ae00cb564bab96ab1f" }, { "fixed": "82ea9d4fc05fb7a387db547c6a7c0aa6a3719616" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" } ] }, { "package": { "ecosystem": "Linux", "name": "Kernel" }, "ranges": [ { "events": [ { "introduced": "2.6.32" }, { "fixed": "6.12.109" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.13.0" }, { "fixed": "6.18.50" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.19.0" }, { "fixed": "7.2.4" } ], "type": "ECOSYSTEM" } ] } ], "database_specific": { "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89496.json" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: always run deallocs on copy-on-write completion\n\nLocal fuzzing of 6.12.94 has found the following memory leak\ncaused by doing 'copy_file_range()' within the same filesystem:\n\nunreferenced object 0xffff88812192c980 (size 32):\n comm \"syz.0.49\", pid 12095, jiffies 4294964143\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 ................\n c0 c5 92 21 81 88 ff ff 00 02 00 00 00 06 00 00 ...!............\n backtrace (crc 7068d63f):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n ocfs2_find_per_slot_free_list fs/ocfs2/alloc.c:6618 [inline]\n ocfs2_cache_block_dealloc+0x155/0x4b0 fs/ocfs2/alloc.c:6786\n ocfs2_cache_extent_block_free fs/ocfs2/alloc.c:6819 [inline]\n ocfs2_unlink_path+0x286/0x450 fs/ocfs2/alloc.c:2613\n ocfs2_rotate_subtree_left fs/ocfs2/alloc.c:2779 [inline]\n __ocfs2_rotate_tree_left+0x1f6f/0x2da0 fs/ocfs2/alloc.c:2985\n ocfs2_rotate_tree_left+0x283/0xe00 fs/ocfs2/alloc.c:3237\n ocfs2_try_to_merge_extent+0xf56/0x1a20 fs/ocfs2/alloc.c:3825\n ocfs2_split_extent+0x15f4/0x2940 fs/ocfs2/alloc.c:5138\n ocfs2_clear_ext_refcount+0x2f6/0x550 fs/ocfs2/refcounttree.c:3098\n ocfs2_replace_clusters fs/ocfs2/refcounttree.c:3131 [inline]\n ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3255 [inline]\n ocfs2_replace_cow+0x991/0x1660 fs/ocfs2/refcounttree.c:3349\n ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3427 [inline]\n ocfs2_refcount_cow+0x5e1/0x9f0 fs/ocfs2/refcounttree.c:3470\n ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2340 [inline]\n ocfs2_file_write_iter+0xbda/0x1880 fs/ocfs2/file.c:2451\n iter_file_splice_write+0x890/0xf60 fs/splice.c:743\n do_splice_from fs/splice.c:944 [inline]\n direct_splice_actor+0x232/0x480 fs/splice.c:1167\n splice_direct_to_actor+0x4b4/0xb60 fs/splice.c:1111\n do_splice_direct_actor fs/splice.c:1210 [inline]\n do_splice_direct+0x10f/0x1c0 fs/splice.c:1236\n do_sendfile+0x430/0xbf0 fs/read_write.c:1388\n\nunreferenced object 0xffff88812192c5c0 (size 32):\n comm \"syz.0.49\", pid 12095, jiffies 4294964143\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 29 70 00 00 00 00 00 00 19 00 00 00 00 00 00 00 )p..............\n backtrace (crc afec850f):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n kzalloc_noprof include/linux/slab.h:1014 [inline]\n ocfs2_cache_block_dealloc+0x25c/0x4b0 fs/ocfs2/alloc.c:6793\n ocfs2_cache_extent_block_free fs/ocfs2/alloc.c:6819 [inline]\n ocfs2_unlink_path+0x286/0x450 fs/ocfs2/alloc.c:2613\n ocfs2_rotate_subtree_left fs/ocfs2/alloc.c:2779 [inline]\n __ocfs2_rotate_tree_left+0x1f6f/0x2da0 fs/ocfs2/alloc.c:2985\n ocfs2_rotate_tree_left+0x283/0xe00 fs/ocfs2/alloc.c:3237\n ocfs2_try_to_merge_extent+0xf56/0x1a20 fs/ocfs2/alloc.c:3825\n ocfs2_split_extent+0x15f4/0x2940 fs/ocfs2/alloc.c:5138\n ocfs2_clear_ext_refcount+0x2f6/0x550 fs/ocfs2/refcounttree.c:3098\n ocfs2_replace_clusters fs/ocfs2/refcounttree.c:3131 [inline]\n ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3255 [inline]\n ocfs2_replace_cow+0x991/0x1660 fs/ocfs2/refcounttree.c:3349\n ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3427 [inline]\n ocfs2_refcount_cow+0x5e1/0x9f0 fs/ocfs2/refcounttree.c:3470\n ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2340 [inline]\n ocfs2_file_write_iter+0xbda/0x1880 fs/ocfs2/file.c:2451\n iter_file_splice_write+0x890/0xf60 fs/splice.c:743\n do_splice_from fs/splice.c:9\n---truncated---", "id": "CVE-2026-89496", "modified": "2026-09-13T03:30:37.209248220Z", "published": "2026-09-11T19:43:46.772Z", "references": [ { "type": "WEB", "url": "https://git.kernel.org/stable/c/09e93a60e18e83a630ff84ae00cb564bab96ab1f" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/123c050eb96aae0bab74c9f06c6ad3de7992722b" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/71f07b7f90b3109c9098d1b9c8efbbeece5deb8a" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616" }, { "type": "ADVISORY", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89496.json" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89496" }, { "type": "PACKAGE", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git" } ], "schema_version": "1.9.0", "summary": "ocfs2: always run deallocs on copy-on-write completion" }