CVE-2024-39490

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ipv6: sr: fix missing sk_buff release in seg6_input_core<br /> <br /> The seg6_input() function is responsible for adding the SRH into a<br /> packet, delegating the operation to the seg6_input_core(). This function<br /> uses the skb_cow_head() to ensure that there is sufficient headroom in<br /> the sk_buff for accommodating the link-layer header.<br /> In the event that the skb_cow_header() function fails, the<br /> seg6_input_core() catches the error but it does not release the sk_buff,<br /> which will result in a memory leak.<br /> <br /> This issue was introduced in commit af3b5158b89d ("ipv6: sr: fix BUG due<br /> to headroom too small after SRH push") and persists even after commit<br /> 7a3f5b0de364 ("netfilter: add netfilter hooks to SRv6 data plane"),<br /> where the entire seg6_input() code was refactored to deal with netfilter<br /> hooks.<br /> <br /> The proposed patch addresses the identified memory leak by requiring the<br /> seg6_input_core() function to release the sk_buff in the event that<br /> skb_cow_head() fails.