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CVE PROGRAM SOURCE RECORD7.1 High

CVE-2026-98169

smb: client: fix potential OOB read in smb3_enum_snapshots()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential OOB read in smb3_enum_snapshots() If snapshot_array_size is smaller than GMT_TOKEN_SIZE, smb3_enum_snapshots() sets ret_data_len to sizeof(struct smb_snapshot_array) without verifying the actual length of the server's reply. Because SMB2_ioctl() places no lower bound on the server-supplied OutputCount and allocates retbuf to exactly that length, a short reply results in ret_data_len exceeding the size of retbuf. The subsequent copy_to_user() then reads past the end of retbuf, leaking adjacent slab memory to userspace. The subsequent clamp check is ineffective as it only reduces ret_data_len. Fix this by rejecting replies shorter than sizeof(struct smb_snapshot_array) with -EIO. Note that the bound is set to the 12-byte struct size rather than the 16-byte MIN_SNAPSHOT_ARRAY_SIZE defined in MS-SMB2 3.3.5.15.1, because 12 bytes is exactly what copy_to_user() attempts to read.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 67ef1d6da00f4f39eb5fcebe7a44fe494b645059affected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 5edf5b398d49b881c0df79d6e4f6df251236c533affected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 15a221c734b9d044ab769e7e3606b2cab96fb65aaffected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 74995ee8305a7c4d76ee70d6acd996a75eda3c03affected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 210f0f1f67817e7d2348b86b5115a9b85ef5c98baffected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 1cdf0d304d820fb13bf0faf532c3459600f9ea43affected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < dbe452a905dfe2804647530a9ff3d7e3826ed04daffected
  • e02789a53d71334b067ad72eee5d4e88a0158083 to < 4775c3b7a597907e0b97556c7986fda238a377aeaffected
  • a94703ff8e3647f8a9a3a92a468450299a7b77e9affected
  • 82a856f527334ffd69aae26e7dd9e03b19c4a520affected
  • 25b981bfe192fd208ba04c81f4aa30ffb5141660affected
  • 4.9.125 to < 4.10affected
  • 4.14.68 to < 4.15affected
  • 4.18.6 to < 4.19affected

Linux Linux

Default version status: affected

  • 4.19affected
  • 0 to < 4.19unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.189 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.54 to ≤ 6.18.*unaffected
  • 7.2.8 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References