CVE-2026-89794

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < f188a400dd5285fec5a84548fe8dca49eee01155affected
LinuxLinuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < d83a9de7cecd401c3d3e00ed6371194dcd7313e4affected
LinuxLinuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < be15b8da4a82cf1e1f9880b2661b90770606eec1affected
LinuxLinuxe2b76ab8b5c9327ab2dae6da05d0752eb2f4771d < 73f860489e3be2245598d1819226304fc5b87291affected
LinuxLinuxf2283680a80571ca82d710bc6ecd8f8beac67d63affected
LinuxLinux9f297df20d93411c0b4ddad7f88ba04a7cd36e77affected
LinuxLinux5.15.145 < 5.16affected
LinuxLinux6.1.71 < 6.2affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References