CVE-2025-40168
In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match(). smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu(). Note that the returned value of smc_clc_prfx_match() is not used in the caller.
Affected versions
Linux kernel versions
4.11
and later are affected. Fixed in
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40168 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/235f81045c008169cc4e1955b4a64e118eebe61b
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PatchKernel patch commithttps://git.kernel.org/stable/c/d26e80f7fb62d77757b67a1b94e4ac756bc9c658
Frequently asked questions
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What is CVE-2025-40168?
CVE-2025-40168 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.11 onward and has been patched in 6.17.3 and 6.18. CVE-2025-40168 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40168?
Yes — CVE-2025-40168 has been patched. Fixed versions include 6.17.3 and 6.18. If you are running Linux kernel 4.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40168 actively exploited?
No — CVE-2025-40168 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.