CVE-2025-40139

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.

PUBLISHED Reserved 2025-04-16 | Published 2025-11-12 | Updated 2025-12-01 | Assigner Linux

Product status

References

git.kernel.org/...c/0736993bfe5c7a9c744ae3fac62d769dfdae54e1

git.kernel.org/...c/935d783e5de9b64587f3adb25641dd8385e64ddb

cve.org (CVE-2025-40139)

nvd.nist.gov (CVE-2025-40139)

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