CVE-2025-37750

A use-after-free (UAF) vulnerability was found in the Linux kernel's SMB client functionality. A local attacker with permissions to connect to arbitrary SMB servers with precise timing could exploit this flaw to alter system memory, leading to denials of service, alteration of sensitive memory locations, or privilege escalation.

This vulnerability exists in how the SMB client manages cryptography for multi-channel connections. When using multi-channel connections, there is a possibility that a race condition will occur in separate threads. In that case, it is possible for one thread to free memory related to cryptography before another thread accesses it. An attacker could leverage that vulnerability to modify kernel memory, which could result in an escalation of privileges as well as potentially impacting system stability and integrity.

The changes in multichannel SMB client cryptography management that led to this vulnerability are not present in Red Hat Enterprise Linux prior to 9.6.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.