{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89779","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.765Z","datePublished":"2026-09-16T08:48:19.083Z","dateUpdated":"2026-09-16T14:38:31.147Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-16T14:38:31.147Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate ef->size covers the record's name and value\n\nWhen an EA record has a non-zero ef->size, ntfs_read_ea() only checks\nthat the record fits in the remaining buffer (ea_size > bytes), not that\nef->size is large enough to hold the record's own name_len + 1 + elength.\n\nA crafted image can pass validation with, e.g., ef->size = 24 but\nelength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of\nthe undersized record, reading past the kmalloc(info->size) allocation\nand leaking heap memory to userspace via getxattr():\n\n BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)\n Read of size 65535 at addr ffff888100794550 by task exploit\n  __asan_memcpy (mm/kasan/shadow.c:105)\n  ntfs_get_ea (fs/ntfs3/xattr.c:302)\n  ntfs_getxattr (fs/ntfs3/xattr.c:848)\n  __vfs_getxattr (fs/xattr.c:441)\n  vfs_getxattr (fs/xattr.c:474)\n  do_getxattr (fs/xattr.c:800)\n  path_getxattrat (fs/xattr.c:868)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n\n The buggy address is located 80 bytes inside of\n  allocated 84-byte region in cache kmalloc-96\n\nCompute the size the record needs and require ef->size to cover it."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":9.1,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - ntfs3 registers export_operations and an empty-prefix xattr handler, so ksmbd SMB2 QUERY_INFO FILE_FULL_EA and nfsd GETXATTR reach vfs_getxattr→ntfs_getxattr→ntfs_get_ea on an exported NTFS volume; a crafted EA named user.* is listed and returned over the network on NAS/hybrid SMB/NFS servers.\nAC:L - The attacker fully controls on-disk EA_FULL fields; ef->size=24 with elength=0xffff passes ntfs_read_ea() and makes ntfs_get_ea() memcpy 65535 bytes past the kmalloc(info->size) object deterministically, with no race or attacker-uncontrollable layout.\nPR:N - The leak needs only read access to a file carrying the crafted EA: a ksmbd guest/anonymous client with FILE_READ_EA, an NFSv4 AUTH_SYS/guest GETXATTR, or automount of attacker media, with no local account or CAP_SYS_ADMIN on the host.\nUI:N - After the NTFS volume is mounted and exported—the normal state for NAS, dual-boot, and automounted removable NTFS—the attacker issues SMB QUERY_INFO, NFS GETXATTR, or getxattr(2) themselves; no further victim clicks, prompts, or confirmations are required.\nS:U - The slab over-read and heap leak occur in the host kernel ntfs3 xattr path under a single security authority; this is standard filesystem exploitation, not a VM escape, IOMMU/DMA bypass, or other cross-boundary breakout.\nC:H - ntfs_get_ea() copies attacker-chosen elength (up to 65535) bytes from past the kmalloc(info->size) EA buffer into the getxattr output that VFS, ksmbd, and nfsd return to the caller; a ~64KiB kernel-heap leak to userspace or a remote SMB/NFS client is Confidentiality High.\nI:N - The destination is sized from the probed elength (ksmbd/nfsd) or the caller-supplied size with an explicit len>size ERANGE check, so this is a source over-read into a bounds-checked xattr buffer, not an out-of-bounds write, UAF, or control-flow hijack primitive.\nA:H - KASAN reports a 65535-byte slab-out-of-bounds read in ntfs_get_ea from an 84-byte kmalloc-96 object; that unbounded heap over-read can fault unmapped adjacent slab pages and oops or panic the kernel, which is Availability High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/xattr.c"],"versions":[{"version":"333feb7ba84f69f9b423422417aaac54fd9e7c84","lessThan":"b27e68ad818a4ca2cef8f35f97e75d756714c818","status":"affected","versionType":"git"},{"version":"000a9a72efa4a9df289bab9c9e8ba1639c72e0d6","lessThan":"28a924c7e67e6d71abeb04860b61166fecb027fc","status":"affected","versionType":"git"},{"version":"0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b","lessThan":"d585ed08308909c7e6fefb4e8a258aeb29b19ff9","status":"affected","versionType":"git"},{"version":"0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b","lessThan":"077df8464cf24f8ffc82fb6efec2ae600686e699","status":"affected","versionType":"git"},{"version":"0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b","lessThan":"aab1880058ac767d3ea9388a9a7221c776c22c44","status":"affected","versionType":"git"},{"version":"0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b","lessThan":"c8a109c9e23a2c7fd548473dde728b2cb8188146","status":"affected","versionType":"git"},{"version":"0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b","lessThan":"c22f91d82cb9a29d22bdffdce6c803467984ad0c","status":"affected","versionType":"git"},{"version":"5.15.121","lessThan":"5.15.221","status":"affected","versionType":"semver"},{"version":"6.1.40","lessThan":"6.1.188","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/xattr.c"],"versions":[{"version":"6.2","status":"affected"},{"version":"0","lessThan":"6.2","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":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","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":"5.15.121","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.40","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818"},{"url":"https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc"},{"url":"https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9"},{"url":"https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699"},{"url":"https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44"},{"url":"https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146"},{"url":"https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c"}],"title":"fs/ntfs3: validate ef->size covers the record's name and value","x_generator":{"engine":"bippy-1.2.0"}}}}