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vuln-cve/data/2026/89xxx/CVE-2026-89496.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-89496",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.714Z",
"datePublished": "2026-09-11T19:43:46.772Z",
"dateUpdated": "2026-10-19T08:47:47.928Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:47:47.928Z"
},
"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": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/refcounttree.c",
"fs/ocfs2/xattr.c"
],
"versions": [
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "5ff30f07def6d0e6edacf47952807b5ff60f3af6",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "2753e12853ed2023555cec2c5fe22fbaabb2c0b7",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "f0261b3aca027f5c409a402ea22f6982750f911c",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "a4adaa722977f46511d4247172cd4ec991b80ff2",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "123c050eb96aae0bab74c9f06c6ad3de7992722b",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "71f07b7f90b3109c9098d1b9c8efbbeece5deb8a",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "09e93a60e18e83a630ff84ae00cb564bab96ab1f",
"status": "affected",
"versionType": "git"
},
{
"version": "6f70fa519976a379d72781d927cf8e5f5b05ec86",
"lessThan": "82ea9d4fc05fb7a387db547c6a7c0aa6a3719616",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/refcounttree.c",
"fs/ocfs2/xattr.c"
],
"versions": [
{
"version": "2.6.32",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.32",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.270",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"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"
}
]
}
]
}
],
"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"
}
],
"title": "ocfs2: always run deallocs on copy-on-write completion",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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