CVE-2025-38460 Information

Jul 26, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

atm: clip: Fix potential null-ptr-deref in to_atmarpd().

atmarpd is protected by RTNL since commit f3a0592b37b8 ([ATM]: clip causes unregister hang).

However it is not enough because to_atmarpd() is called without RTNL especially clip_neigh_solicit() / neigh_ops->solicit() is unsleepable.

Also there is no RTNL dependency around atmarpd.

Let’s use a private mutex and RCU to protect access to atmarpd in to_atmarpd().

Reference

https://git.kernel.org/stable/c/06935c50cfa3ac57cce80bba67b6d38ec1406e92 https://git.kernel.org/stable/c/3251ce3979f41bd228f77a7615f9dd616d06a110 https://git.kernel.org/stable/c/36caab990b69ef4eec1d81c52a19f080b7daa059 https://git.kernel.org/stable/c/706cc36477139c1616a9b2b96610a8bb520b7119 https://git.kernel.org/stable/c/70eac9ba7ce25d99c1d99bbf4ddb058940f631f9 https://git.kernel.org/stable/c/a4c5785feb979cd996a99cfaad8bf353b2e79301 https://git.kernel.org/stable/c/ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57 https://git.kernel.org/stable/c/f58e4270c73e7f086322978d585ea67c8076ce49

CNNVD-202507-3311 (Published: 2025-07-25)

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