CVE-2026-89794

ksmbd: zero pipe read compound padding

State: Published
Severity: Not scored
Published: Sep 16, 2026
Updated: Oct 30, 2026
Reserved: Sep 11, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	9f297df20d93411c0b4ddad7f88ba04a7cd36e77 to before c7516bdf7d2c1a64b14a9f444e2ee58c12c384aeAffected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before 134d980491b435e5cdb3171225e2506ff17867d1Affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before f188a400dd5285fec5a84548fe8dca49eee01155Affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before d83a9de7cecd401c3d3e00ed6371194dcd7313e4Affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before be15b8da4a82cf1e1f9880b2661b90770606eec1Affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before 73f860489e3be2245598d1819226304fc5b87291Affected f2283680a80571ca82d710bc6ecd8f8beac67d63Affected 6.1.71 to before 6.1.191Affected 5.15.145 to before 5.16Affected
LinuxLinux	6.6Affected before 6.6Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

9f297df20d93411c0b4ddad7f88ba04a7cd36e77 to before c7516bdf7d2c1a64b14a9f444e2ee58c12c384aeAffected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before 134d980491b435e5cdb3171225e2506ff17867d1Affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before f188a400dd5285fec5a84548fe8dca49eee01155Affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before d83a9de7cecd401c3d3e00ed6371194dcd7313e4Affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before be15b8da4a82cf1e1f9880b2661b90770606eec1Affected
e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d to before 73f860489e3be2245598d1819226304fc5b87291Affected
f2283680a80571ca82d710bc6ecd8f8beac67d63Affected
6.1.71 to before 6.1.191Affected
5.15.145 to before 5.16Affected

LinuxLinux

6.6Affected
before 6.6Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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