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Critical

fs/ntfs3: validate ef->size covers the record's name and value

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate ef->size covers the record's name and value When an EA record has a non-zero ef->size, ntfs_read_ea() only checks that the record fits in the remaining buffer (ea_size > bytes), not that ef->size is large enough to hold the record's own name_len + 1 + elength. A crafted image can pass validation with, e.g., ef->size = 24 but elength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of the undersized record, reading past the kmalloc(info->size) 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->size to cover it.

Announced Source revision 1
Original source ↗

CVE-2026-89779

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89779

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "333feb7ba84f69f9b423422417aaac54fd9e7c84",
        "lessThan": "b27e68ad818a4ca2cef8f35f97e75d756714c818",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "000a9a72efa4a9df289bab9c9e8ba1639c72e0d6",
        "lessThan": "28a924c7e67e6d71abeb04860b61166fecb027fc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
        "lessThan": "d585ed08308909c7e6fefb4e8a258aeb29b19ff9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
        "lessThan": "077df8464cf24f8ffc82fb6efec2ae600686e699",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
        "lessThan": "aab1880058ac767d3ea9388a9a7221c776c22c44",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
        "lessThan": "c8a109c9e23a2c7fd548473dde728b2cb8188146",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
        "lessThan": "c22f91d82cb9a29d22bdffdce6c803467984ad0c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.121",
        "lessThan": "5.15.221",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.40",
        "lessThan": "6.1.188",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/ntfs3/xattr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/xattr.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89779

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#35246 · Revision 1
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Publisher date
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