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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-43112

fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read. This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL. The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.

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

  • c63433a09d6ae4c226fcbc66da4c58fc189fd746 to < a2ba20c17de8eb028f96b1d85f119d3d25655bd9affected
  • a31080899d5fdafcccf7f39dd214a814a2c82626 to < fbced33599653471b4581dfe1abc7b467031f126affected
  • a31080899d5fdafcccf7f39dd214a814a2c82626 to < 5d4fe469fe7dbff7d874c196bb680a82f2625d95affected
  • a31080899d5fdafcccf7f39dd214a814a2c82626 to < 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439affected
  • a31080899d5fdafcccf7f39dd214a814a2c82626 to < 86f9c23e0814cfdffda9eedf0c591c51ba209010affected
  • a31080899d5fdafcccf7f39dd214a814a2c82626 to < 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3affected
  • a31080899d5fdafcccf7f39dd214a814a2c82626 to < 78ec5bf2f589ec7fd8f169394bfeca541b077317affected
  • 5.15.11 to < 5.15.209affected

Linux Linux

Default version status: affected

  • 5.16affected
  • 0 to < 5.16unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.136 to ≤ 6.6.*unaffected
  • 6.12.83 to ≤ 6.12.*unaffected
  • 6.18.24 to ≤ 6.18.*unaffected
  • 6.19.14 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References