{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90048","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.783Z","datePublished":"2026-09-16T10:33:44.538Z","dateUpdated":"2026-09-16T14:42:04.456Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-16T14:42:04.456Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()\n\nni_create_attr_list() allocates a fixed buffer of al_aligned(record_size)\n(== record_size) bytes and then walks every attribute of the primary MFT\nrecord, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor\nby le_size(name_len), with no check against the end of the buffer; the\ntotal size is only computed after the loop.\n\nA minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24)\nbytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32)\nbytes in the list.  Because the number of attributes in a record is not\nbounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless\nminimum-size attributes), a crafted record packed with such attributes\nproduces a list larger than record_size and overflows the heap buffer.\n\nThis is reachable from a crafted, loop-mounted NTFS image: opening the file\nand adding an attribute (e.g. via setxattr) drives ntfs_set_ea() ->\nni_insert_resident() -> ni_insert_attr() -> ni_ins_attr_ext() ->\nni_create_attr_list().\n\n  BUG: KASAN: slab-out-of-bounds in ni_create_attr_list+0xc48/0x1058\n  Write of size 4 at addr ffff000008984c00 by task setfattr/345\n   ni_create_attr_list+0xc48/0x1058\n   ni_ins_attr_ext+0x510/0x7c0\n   ni_insert_attr+0x3f8/0x70c\n   ni_insert_resident+0xc8/0x3b0\n   ntfs_set_ea+0x66c/0xd28\n   ntfs_setxattr+0x4d8/0x5b0\n   __arm64_sys_setxattr+0xa4/0x124\n  Allocated by task 345:\n   ni_create_attr_list+0x188/0x1058\n  The buggy address belongs to the cache kmalloc-1k of size 1024\n  (the write lands at object+1024).\n\nSize the buffer from the actual attributes instead of assuming a single\nrecord_size is always enough."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - ntfs3 registers export_operations, so ksmbd/nfsd VFS write and setxattr on an exported NTFS volume reach ni_create_attr_list() via ntfs_set_size/attr_set_size_ex and ntfs_setxattr→ni_insert_resident→ni_ins_attr_ext; NAS/router SMB sharing of USB NTFS is a reasonable high-impact path.\nAC:L - The attacker fully controls a primary MFT record packed with unnamed SIZEOF_RESIDENT attributes, so the ATTR_LIST_ENTRY walk overflows the fixed kzalloc(record_size) buffer on the first attribute insert or allocation extend; no race or attacker-uncontrollable layout is required.\nPR:N - Triggering needs only write or setxattr permission on the crafted file, including guest/anonymous SMB or a permissive NFS export; no local account, init-namespace root, or CAP_SYS_ADMIN is required on the trigger path.\nUI:N - Once the crafted NTFS volume is mounted and exported, or automounted from removable/shared storage, the attacker triggers the overflow with an ordinary write, truncate, or setxattr; no extra victim clicks, prompts, or confirmation are required.\nS:U - The slab out-of-bounds write corrupts kernel heap in the same host OS security authority as ntfs3; it can enable privilege escalation but does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The overflow writes attacker-controlled ATTR_LIST_ENTRY fields (type, name, id) past the kmalloc-1k object into adjacent slab, a heap-corruption primitive that can be leveraged for kernel memory disclosure.\nI:H - The unbounded ATTR_LIST_ENTRY walk is a slab out-of-bounds write of attacker-influenced attribute metadata into adjacent heap objects, enabling arbitrary kernel writes and potential control-flow hijack.\nA:H - KASAN reports a slab-out-of-bounds write in ni_create_attr_list(); overflowing the kmalloc object corrupts adjacent heap and causes a kernel oops, panic, or hang."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/frecord.c"],"versions":[{"version":"4342306f0f0d5ff4315a204d315c1b51b914fca5","lessThan":"7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd","status":"affected","versionType":"git"},{"version":"4342306f0f0d5ff4315a204d315c1b51b914fca5","lessThan":"fa2215cf451414b0512cd6f7d37a057893811f4d","status":"affected","versionType":"git"},{"version":"4342306f0f0d5ff4315a204d315c1b51b914fca5","lessThan":"d07e281f2a7710502985d6f80b95ddac8f4e81d5","status":"affected","versionType":"git"},{"version":"4342306f0f0d5ff4315a204d315c1b51b914fca5","lessThan":"a84f3db72561c4d9281c5ff721ce46b9ffa7f30e","status":"affected","versionType":"git"},{"version":"4342306f0f0d5ff4315a204d315c1b51b914fca5","lessThan":"7c4841e2a62794a3bab7c1ff0540580f387e377f","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/ntfs3/frecord.c"],"versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.51","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.5","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","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":"5.15","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd"},{"url":"https://git.kernel.org/stable/c/fa2215cf451414b0512cd6f7d37a057893811f4d"},{"url":"https://git.kernel.org/stable/c/d07e281f2a7710502985d6f80b95ddac8f4e81d5"},{"url":"https://git.kernel.org/stable/c/a84f3db72561c4d9281c5ff721ce46b9ffa7f30e"},{"url":"https://git.kernel.org/stable/c/7c4841e2a62794a3bab7c1ff0540580f387e377f"}],"title":"fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()","x_generator":{"engine":"bippy-1.2.0"}}}}