CVE-2026-31705
Description
A flaw was found in the ksmbd component of the Linux kernel. This out-of-bounds write vulnerability occurs when processing Server Message Block (SMB) extended attribute (EA) information. Specifically, the smb2_get_ea() function performs an unconditional memory write for alignment padding without checking for sufficient buffer space. This can lead to overwriting adjacent kernel heap memory, potentially allowing a remote attacker to cause a denial of service or execute arbitrary code.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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