Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set(). smc_clc_prfx_set() is called during connect() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock() after kernel_getsockname(). Note that the returned value of smc_clc_prfx_set() is not used in the caller. While at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu() not to touch dst there.
References
- https://git.kernel.org/stable/c/0736993bfe5c7a9c744ae3fac62d769dfdae54e1
- https://git.kernel.org/stable/c/935d783e5de9b64587f3adb25641dd8385e64ddb
FAQ
What is CVE-2025-40139?
CVE-2025-40139 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set(). smc_clc_prfx_set() is called during connect() and not under RC...
How severe is CVE-2025-40139?
CVSS scoring is not yet available for CVE-2025-40139. Check NVD for updates.
Is there a patch for CVE-2025-40139?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.