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Unrated severityNVD Advisory· Published Jul 10, 2024· Updated May 4, 2025

ipv6: sr: fix missing sk_buff release in seg6_input_core

CVE-2024-39490

Description

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

ipv6: sr: fix missing sk_buff release in seg6_input_core

The seg6_input() function is responsible for adding the SRH into a packet, delegating the operation to the seg6_input_core(). This function uses the skb_cow_head() to ensure that there is sufficient headroom in the sk_buff for accommodating the link-layer header. In the event that the skb_cow_header() function fails, the seg6_input_core() catches the error but it does not release the sk_buff, which will result in a memory leak.

This issue was introduced in commit af3b5158b89d ("ipv6: sr: fix BUG due to headroom too small after SRH push") and persists even after commit 7a3f5b0de364 ("netfilter: add netfilter hooks to SRv6 data plane"), where the entire seg6_input() code was refactored to deal with netfilter hooks.

The proposed patch addresses the identified memory leak by requiring the seg6_input_core() function to release the sk_buff in the event that skb_cow_head() fails.

Affected products

118

Patches

5
f4df8c7670a7
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
8f1fc3b86eae
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
e8688218e381
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
5447f9708d9e
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
f5fec1588642
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

5

News mentions

0

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