CVE-2026-89794

ksmbd: zero pipe read compound padding

N/A
Published: September 16, 2026 at 10:30 AM UTC
Updated: October 21, 2026 at 01:20 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
N/A
Exploit prediction
EPSS 0.2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

5.15.1456.1.716.69f297df20d93411c0b4ddad7f88ba04a7cd36e77e2b76ab8b5c9327ab2dae6da05d0752eb2f4771df2283680a80571ca82d710bc6ecd8f8beac67d63
Vendor states this is fixed in 73f860489e3be2245598d1819226304fc5b87291 (fixed)
Vendor states this is fixed in be15b8da4a82cf1e1f9880b2661b90770606eec1 (fixed)
Vendor states this is fixed in d83a9de7cecd401c3d3e00ed6371194dcd7313e4 (fixed)
Vendor states this is fixed in f188a400dd5285fec5a84548fe8dca49eee01155 (fixed)
Affected range stops below 5.16, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 6.12.110 (unaffected)
Vendor states this is fixed in 6.18.51 (unaffected)
Affected range stops below 6.2, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 6.6 (unaffected)
Vendor states this is fixed in 6.6.160 (unaffected)
Vendor states this is fixed in 7.2.5 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)
Vendor states this is fixed in 7.3-rc2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

Quick Info

StatusRECEIVED

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