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CVE PROGRAM SOURCE RECORD8.1 High

CVE-2026-98454

smb: client: fix create context out-of-bounds reads

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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 create context out-of-bounds reads smb2_parse_contexts() validates the complete create-context area but does not limit each record to its Next field before dispatching it. A malformed chain can therefore expose bytes beyond the current context to a handler. The QFid handler also used a full response-structure cast although it only reads DiskFileId. The SMB2/SMB3 lease parsers made the same layout assumption: they read LeaseState and LeaseFlags at canonical offsets rather than at DataOffset. A valid non-canonical DataOffset could therefore yield unrelated in-bounds data, while a short DataLength was still accepted. Limit each context to its Next value, reject offsets before the context header, and reject malformed chains. Bound the name range by the current context and do not dispatch a known handler when DataLength is zero. Read the QFid DiskFileId only when the context data covers that field. Parse the lease context from DataOffset and require DataLength to match the v1 or v2 lease_context size used by ksmbd. A size mismatch skips lease parsing without failing the open.

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

  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < 34245048d6c1fa6d7be4f0dec1d14b5be02360e1affected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < 0a8c2a6715c2a67b7abbbf874fccc9f5518146d9affected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < 43d0ca48bb902d554b6531862248810d2ae3b8efaffected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < e4c49012708c917eafd9c27054b02d0f8b30fe64affected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < 28bc9a871799363afa3139e961a8e3684feb8704affected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < 05a7fd80024ff32b9b40ab1478bb172eeab1c386affected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < cecc5399987e73a528ce2b662eeb54af69163cbdaffected
  • b8c32dbb0deb287a5fcb78251e4eae6c7275760d to < 67f4c1c6a1b51e203d986779299824d1c2c590a6affected

Linux Linux

Default version status: affected

  • 3.7affected
  • 0 to < 3.7unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.55 to ≤ 6.18.*unaffected
  • 7.2.9 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References