CVE-2026-43185

Summary

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix signededness bug in smb_direct_prepare_negotiation()

smb_direct_prepare_negotiation() casts an unsigned __u32 value from sp->max_recv_size and req->preferred_send_size to a signed int before computing min_t(int, …). A maliciously provided preferred_send_size of 0x80000000 will return as smaller than max_recv_size, and then be used to set the maximum allowed alowed receive size for the next message.

By sending a second message with a large value (>1420 bytes) the attacker can then achieve a heap buffer overflow.

This fix replaces min_t(int, …) with min_t(u32)

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/ceae058eb707ddd0d68f0872f9d9f23b7c30c37b
• https://git.kernel.org/stable/c/55abc475d096da4a5356b6efb0cfdc6156bc1550
• https://git.kernel.org/stable/c/6b4f875aac344cdd52a1f34cc70ed2f874a65757

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