{
  "cveId": "CVE-2026-89779",
  "url": "https://patchblox.com/security/cve/CVE-2026-89779",
  "summary": "CVE-2026-89779 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-89779, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "fs/ntfs3: validate ef-\u003Esize covers the record\u0027s name and value",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fs/ntfs3: validate ef-\u003Esize covers the record\u0027s name and value  When an EA record has a non-zero ef-\u003Esize, ntfs_read_ea() only checks that the record fits in the remaining buffer (ea_size \u003E bytes), not that ef-\u003Esize is large enough to hold the record\u0027s own name_len \u002B 1 \u002B elength.  A crafted image can pass validation with, e.g., ef-\u003Esize = 24 but elength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of the undersized record, reading past the kmalloc(info-\u003Esize) allocation and leaking heap memory to userspace via getxattr():   BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)  Read of size 65535 at addr ffff888100794550 by task exploit   __asan_memcpy (mm/kasan/shadow.c:105)   ntfs_get_ea (fs/ntfs3/xattr.c:302)   ntfs_getxattr (fs/ntfs3/xattr.c:848)   __vfs_getxattr (fs/xattr.c:441)   vfs_getxattr (fs/xattr.c:474)   do_getxattr (fs/xattr.c:800)   path_getxattrat (fs/xattr.c:868)   do_syscall_64 (arch/x86/entry/syscall_64.c:94)   The buggy address is located 80 bytes inside of   allocated 84-byte region in cache kmalloc-96  Compute the size the record needs and require ef-\u003Esize to cover it.",
  "published": "2026-09-16T09:17:08Z",
  "severity": "Important",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00697,
  "epssPercentile": 0.53308,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89779",
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  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}