Linux Kernel Vulnerability: smb Client Issue Related to Cached Fid Bitfields
CVE-2026-23230

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 18 February 2026

What is CVE-2026-23230?

A race condition exists in the Linux kernel's smb client where multiple code paths may concurrently modify shared byte flags within the cached_fid struct, leading to unreliable status updates. Specifically, the flags 'is_open', 'has_lease', and 'on_list' are stored in a single byte, which can result in unintended overwrites during operations. This vulnerability can cause stale values to be restored when operations interleave between CPUs, potentially jeopardizing the integrity of the system. To mitigate this issue, these flags should be converted into separate boolean fields, ensuring that updates do not interfere with one another.

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