CVE-2026-89794 PUBLISHED

ksmbd: zero pipe read compound padding

Assigner: Linux
Reserved: 11.09.2026 Published: 16.09.2026 Updated: 16.09.2026

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: zero pipe read compound padding

Compound response handling extends the last response iov to an eight-byte boundary.

smb2_read_pipe() allocates only the payload size, so the alignment padding can expose up to seven bytes of uninitialized kernel heap memory.

Allocate the aligned size and clear the unused tail before pinning the response buffer.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to f188a400dd5285fec5a84548fe8dca49eee01155 (excl.)
  • affected from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to d83a9de7cecd401c3d3e00ed6371194dcd7313e4 (excl.)
  • affected from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to be15b8da4a82cf1e1f9880b2661b90770606eec1 (excl.)
  • affected from e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to 73f860489e3be2245598d1819226304fc5b87291 (excl.)
  • Version f2283680a80571ca82d710bc6ecd8f8beac67d63 is affected
  • Version 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 is affected
  • affected from 5.15.145 to 5.16 (excl.)
  • affected from 6.1.71 to 6.2 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.6 is affected
  • unaffected from 0 to 6.6 (excl.)
  • unaffected from 6.12.110 to 6.12.* (incl.)
  • unaffected from 6.18.51 to 6.18.* (incl.)
  • unaffected from 7.2.5 to 7.2.* (incl.)
  • unaffected from 7.3-rc2 to * (incl.)

References