{"id":"CVE-2026-89496","state":"PUBLISHED","title":"ocfs2: always run deallocs on copy-on-write completion","description":"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---","publishedAt":"2026-09-11T19:43:46.772Z","updatedAt":"2026-10-19T08:47:47.928Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"5ff30f07def6d0e6edacf47952807b5ff60f3af6","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"2753e12853ed2023555cec2c5fe22fbaabb2c0b7","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"f0261b3aca027f5c409a402ea22f6982750f911c","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"a4adaa722977f46511d4247172cd4ec991b80ff2","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"123c050eb96aae0bab74c9f06c6ad3de7992722b","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"71f07b7f90b3109c9098d1b9c8efbbeece5deb8a","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"09e93a60e18e83a630ff84ae00cb564bab96ab1f","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"82ea9d4fc05fb7a387db547c6a7c0aa6a3719616","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/refcounttree.c","fs/ocfs2/xattr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.32","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.32","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/refcounttree.c","fs/ocfs2/xattr.c"]}],"references":["https://git.kernel.org/stable/c/5ff30f07def6d0e6edacf47952807b5ff60f3af6","https://git.kernel.org/stable/c/2753e12853ed2023555cec2c5fe22fbaabb2c0b7","https://git.kernel.org/stable/c/f0261b3aca027f5c409a402ea22f6982750f911c","https://git.kernel.org/stable/c/a4adaa722977f46511d4247172cd4ec991b80ff2","https://git.kernel.org/stable/c/123c050eb96aae0bab74c9f06c6ad3de7992722b","https://git.kernel.org/stable/c/71f07b7f90b3109c9098d1b9c8efbbeece5deb8a","https://git.kernel.org/stable/c/09e93a60e18e83a630ff84ae00cb564bab96ab1f","https://git.kernel.org/stable/c/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89496.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89496","state":"PUBLISHED","datePublished":"2026-09-11T19:43:46.772Z","dateUpdated":"2026-10-19T08:47:47.928Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.714Z"},"containers":{"cna":{"title":"ocfs2: always run deallocs on copy-on-write completion","descriptions":[{"lang":"en","value":"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---"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"5ff30f07def6d0e6edacf47952807b5ff60f3af6","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"2753e12853ed2023555cec2c5fe22fbaabb2c0b7","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"f0261b3aca027f5c409a402ea22f6982750f911c","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"a4adaa722977f46511d4247172cd4ec991b80ff2","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"123c050eb96aae0bab74c9f06c6ad3de7992722b","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"71f07b7f90b3109c9098d1b9c8efbbeece5deb8a","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"09e93a60e18e83a630ff84ae00cb564bab96ab1f","versionType":"git"},{"version":"6f70fa519976a379d72781d927cf8e5f5b05ec86","status":"affected","lessThan":"82ea9d4fc05fb7a387db547c6a7c0aa6a3719616","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/refcounttree.c","fs/ocfs2/xattr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.32","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.32","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/refcounttree.c","fs/ocfs2/xattr.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5ff30f07def6d0e6edacf47952807b5ff60f3af6"},{"url":"https://git.kernel.org/stable/c/2753e12853ed2023555cec2c5fe22fbaabb2c0b7"},{"url":"https://git.kernel.org/stable/c/f0261b3aca027f5c409a402ea22f6982750f911c"},{"url":"https://git.kernel.org/stable/c/a4adaa722977f46511d4247172cd4ec991b80ff2"},{"url":"https://git.kernel.org/stable/c/123c050eb96aae0bab74c9f06c6ad3de7992722b"},{"url":"https://git.kernel.org/stable/c/71f07b7f90b3109c9098d1b9c8efbbeece5deb8a"},{"url":"https://git.kernel.org/stable/c/09e93a60e18e83a630ff84ae00cb564bab96ab1f"},{"url":"https://git.kernel.org/stable/c/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:47:47.928Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}