PT-2026-44262 · Linux · Linux Kernel
Published
2026-05-28
·
Updated
2026-06-04
·
CVE-2026-46139
None
No severity ratings or metrics are available. When they are, we'll update the corresponding info on the page.
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
In the SMB client, the
build sec desc() function uses a buffer allocated with kmalloc(), which does not zero-initialize the memory. Due to a change in the struct smb acl where the num aces field was split into num aces and a reserved field, the 2-byte reserved field is not explicitly written to. This leaves the field containing uninitialized heap data. If this field contains non-zero garbage, Samba may reject the security descriptor, resulting in a Range Error and causing chmod to fail with EINVAL.Recommendations
Update the Linux kernel to a version that replaces
kmalloc() with kzalloc() in the build sec desc() function to ensure the buffer is zero-initialized. Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
Linux Kernel