What’s Vulnerable › Vulnerabilities

CVE-2026-89794: ksmbd: zero pipe read compound padding

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-30

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.

Affected products

• Linux: from 6.1.71 before 6.1.191; from 5.15.145 before 5.16 — fixed in 6.1.191, 5.16

How to fix

Upgrade to a fixed version: Linux 6.1.191, 5.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/134d980491b435e5cdb3171225e2506ff17867d1
• https://git.kernel.org/stable/c/73f860489e3be2245598d1819226304fc5b87291
• https://git.kernel.org/stable/c/be15b8da4a82cf1e1f9880b2661b90770606eec1
• https://git.kernel.org/stable/c/c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae
• https://git.kernel.org/stable/c/d83a9de7cecd401c3d3e00ed6371194dcd7313e4
• https://git.kernel.org/stable/c/f188a400dd5285fec5a84548fe8dca49eee01155

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