CVE-2024-27390

MEDIUM
Published May 1, 2024 Modified Sep 18, 2025

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down() As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()")) I think the synchronize_net() call in ipv6_mc_down() is not needed. Under load, synchronize_net() can last between 200 usec and 5 ms. KASAN seems to agree as well.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/17ef8efc00b34918b966388b2af0993811895a8c https://git.kernel.org/stable/c/26d4bac55750d535f1f0b8790dc26daf6089e373 https://git.kernel.org/stable/c/5da9a218340a2bc804dc4327e5804392e24a0b88 https://git.kernel.org/stable/c/7eb06ee5921189812e6b4bfe7b0f1e878be16df7 https://git.kernel.org/stable/c/9d159d6637ccce25f879d662a480541ef4ba3a50 https://git.kernel.org/stable/c/a03ede2282ebbd181bd6f5c38cbfcb5765afcd04 https://git.kernel.org/stable/c/17ef8efc00b34918b966388b2af0993811895a8c https://git.kernel.org/stable/c/26d4bac55750d535f1f0b8790dc26daf6089e373 https://git.kernel.org/stable/c/5da9a218340a2bc804dc4327e5804392e24a0b88 https://git.kernel.org/stable/c/7eb06ee5921189812e6b4bfe7b0f1e878be16df7 https://git.kernel.org/stable/c/9d159d6637ccce25f879d662a480541ef4ba3a50 https://git.kernel.org/stable/c/a03ede2282ebbd181bd6f5c38cbfcb5765afcd04

Frequently Asked Questions

What is CVE-2024-27390? +
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down() As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()")) I think the synchronize_net() call in ipv6_mc_down() is not needed. Under load, synchronize_net() can last between 200 usec and 5 ms. KASAN seems to agree as well. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-27390? +
CVE-2024-27390 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-27390? +
CVE-2024-27390 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-27390? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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