CVE-2025-40139

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/0736993bfe5c7a9c744ae3fac62d769dfdae54e1
• https://git.kernel.org/stable/c/935d783e5de9b64587f3adb25641dd8385e64ddb

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