CVE-2026-43450

Technical Description

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

netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()

nfnl_cthelper_dump_table() has a 'goto restart' that jumps to a label

inside the for loop body. When the "last" helper saved in cb->args[1]

is deleted between dump rounds, every entry fails the (cur != last)

check, so cb->args[1] is never cleared. The for loop finishes with

cb->args[0] == nf_ct_helper_hsize, and the 'goto restart' jumps back

into the loop body bypassing the bounds check, causing an 8-byte

out-of-bounds read on nf_ct_helper_hash[nf_ct_helper_hsize].

The 'goto restart' block was meant to re-traverse the current bucket

when "last" is no longer found, but it was placed after the for loop

instead of inside it. Move the block into the for loop body so that

the restart only occurs while cb->args[0] is still within bounds.

BUG: KASAN: slab-out-of-bounds in nfnl_cthelper_dump_table+0x9f/0x1b0

Read of size 8 at addr ffff888104ca30

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References