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CVE-2026-98169

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.43%Chance of exploitation activity in the next 30 days, higher than 36% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in15a221c734b9d044ab769e7e3606b2cab96fb65aAlso 74995ee8305a7c4d76ee70d6acd996a75eda3c03, 210f0f1f67817e7d2348b86b5115a9b85ef5c98b and 5 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 15a221c734b9d044ab769e7e3606b2cab96fb65aLinuxCVE List
  • 74995ee8305a7c4d76ee70d6acd996a75eda3c03LinuxCVE List
  • 210f0f1f67817e7d2348b86b5115a9b85ef5c98bLinuxCVE List
  • 1cdf0d304d820fb13bf0faf532c3459600f9ea43LinuxCVE List
  • 4775c3b7a597907e0b97556c7986fda238a377aeLinuxCVE List
  • 4.10LinuxCVE List
Show all 8 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 20

  • Linuxaffected: e02789a53d71334b067ad72eee5d4e88a0158083 before 15a221c734b9d044ab769e7e3606b2cab96fb65aCVE List
  • Linuxaffected: e02789a53d71334b067ad72eee5d4e88a0158083 before 74995ee8305a7c4d76ee70d6acd996a75eda3c03CVE List
  • Linuxaffected: e02789a53d71334b067ad72eee5d4e88a0158083 before 210f0f1f67817e7d2348b86b5115a9b85ef5c98bCVE List
  • Linuxaffected: e02789a53d71334b067ad72eee5d4e88a0158083 before 1cdf0d304d820fb13bf0faf532c3459600f9ea43CVE List
  • Linuxaffected: e02789a53d71334b067ad72eee5d4e88a0158083 before dbe452a905dfe2804647530a9ff3d7e3826ed04dCVE List
  • Linuxaffected: e02789a53d71334b067ad72eee5d4e88a0158083 before 4775c3b7a597907e0b97556c7986fda238a377aeCVE List
  • Linuxaffected: a94703ff8e3647f8a9a3a92a468450299a7b77e9CVE List
  • Linuxaffected: 82a856f527334ffd69aae26e7dd9e03b19c4a520CVE List
  • Linuxaffected: 25b981bfe192fd208ba04c81f4aa30ffb5141660CVE List
  • Linuxaffected: 4.9.125 before 4.10CVE List
  • Linuxaffected: 4.14.68 before 4.15CVE List
  • Linuxaffected: 4.18.6 before 4.19CVE List
  • Linuxaffected: 4.19CVE List
  • Linuxunaffected: all versions before 4.19CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 6