CVE-2026-64006

Technical Description

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

netfilter: nf_tables: fix dst corruption in same register operation

For lshift and rshift, the shift operations are performed in a loop over

32-bit words. The loop calculates the shifted value and write it to dst,

and then immediately reads from src to calculate the carry for the next

iteration. Because src and dst could point to the same memory location,

the carry is incorrectly calculated using the newly modified dst value

instead of the original src value.

Adding a temporary local variable to cache the original value before

writing to dst and using it for the carry calculation solves the

problem. In addition, partial overlap is rejected from control plane for

all kind of operations including byteorder. This was tested with the

following bytecode:

table test_table ip flags 0 use 1 handle 1

ip test_table test_chain use 3 type filter hook input prio 0 policy accept packets 0 bytes 0 flags 1

ip test_table test_chain

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References