CVE-2024-47685

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.6.58

Description The issue is related to the nf reject ip6 tcphdr put() function in the Linux kernel's netfilter module, which may send garbage on the four reserved TCP bits (th->res1). This is due to the use of uninitialized memory. The problem can be resolved by using skb put zero() to clear the whole TCP header, as done in nf reject ip tcphdr put(). The vulnerability may allow an attacker to impact the confidentiality and availability of protected information.

Recommendations To resolve the issue, update the Linux kernel to version 6.6.58 or later. As a temporary workaround, consider disabling the nf reject ip6 tcphdr put() function until a patch is available. Restrict access to the vulnerable nf reject ipv6 module to minimize the risk of exploitation. Avoid using the th->res1 variable in the affected TCP header until the issue is resolved.