CVE-2025-38460

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a4c5785feb979cd996a99cfaad8bf353b2e79301affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 70eac9ba7ce25d99c1d99bbf4ddb058940f631f9affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3251ce3979f41bd228f77a7615f9dd616d06a110affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 06935c50cfa3ac57cce80bba67b6d38ec1406e92affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 36caab990b69ef4eec1d81c52a19f080b7daa059affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f58e4270c73e7f086322978d585ea67c8076ce49affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 706cc36477139c1616a9b2b96610a8bb520b7119affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.4.296 <= 5.4.*unaffected
LinuxLinux5.10.240 <= 5.10.*unaffected
LinuxLinux5.15.189 <= 5.15.*unaffected
LinuxLinux6.1.146 <= 6.1.*unaffected
LinuxLinux6.6.99 <= 6.6.*unaffected
LinuxLinux6.12.39 <= 6.12.*unaffected
LinuxLinux6.15.7 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References