CVE-2026-74669 (CVSS 9.8)

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it to icmp_send(). However, IPCB(skb)->opt still describes the outer IPv4 header. A timestamp option in the outer header can therefore leave an offset that points into the quoted transport header after the rebase. __ip_options_echo() treats a byte at that stale location as the option length and copies it into the fixed-size option storage on the __icmp_send() stack, causing a stack out-of-bounds write. Clear the stale option metadata after resetting the network header. Keep the remaining control block fields, including the ingress interface used by the ICMP response path.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0051

Probability of exploitation

0.43%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5 https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50 https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00 https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28 https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9 https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006

Frequently Asked Questions

What is CVE-2026-74669? +

In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it to icmp_send(). However, IPCB(skb)->opt still describes the outer IPv4 header. A timestamp option in the outer header can therefore leave an offset that points into the quoted transport header after the rebase. __ip_options_echo() treats a byte at that stale location as the option length and copies it into the fixed-size option storage on the __icmp_send() stack, causing a stack out-of-bounds write. Clear the stale option metadata after resetting the network header. Keep the remaining control block fields, including the ingress interface used by the ICMP response path. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-74669? +

CVE-2026-74669 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0051, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-74669? +

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.

CVE-2026-74669