In the Linux kernel, the following vulnerability has been resolved:

netfilter: x_tables: avoid leaking percpu counter pointers

The native and compat get-entries paths copy the fixed rule entry header
from the kernelized rule blob to userspace before overwriting the entry's
counter fields with a sanitized counter snapshot.

On SMP kernels, entry->counters.pcnt contains the percpu allocation
address used by x_tables rule counters. A caller can provide a userspace
buffer that faults during the initial fixed-header copy after pcnt has
been copied but before the later sanitized counter copy runs. The syscall
then returns -EFAULT while leaving the raw percpu pointer in userspace.

Copy only the fixed entry prefix before counters from the kernelized rule
blob, then copy the sanitized counter snapshot into the counter field.
Apply this ordering to the IPv4, IPv6, and ARP native and compat
get-entries implementations so a fault cannot expose the internal percpu
counter pointer.

https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe

https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45

https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c

https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c

https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e

https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb

https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f

https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5

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