Bug 2414482 (CVE-2025-40168) - CVE-2025-40168 kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match()
Summary: CVE-2025-40168 kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_p...
Keywords:
Status: NEW
Alias: CVE-2025-40168
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-11-12 11:02 UTC by OSIDB Bzimport
Modified: 2025-11-21 09:39 UTC (History)
0 users

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Description OSIDB Bzimport 2025-11-12 11:02:38 UTC 
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.
Comment 1 Alexander B 2025-11-13 15:48:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40168-bdd5@gregkh/T
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