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CVE-2026-74669

Unknown

Last modified

CVE-2026-74669 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < 79ffa99202c944467e28b13b513bf2998732edff; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < c9413b50204738fbc429bb86bf01353c393a6c28; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < 37c61b3745129cbd682c557b51345828120972e5; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < ed246dd85ebf27c1f6b7897834d40786c0ca3006; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < 6f46fc460e9316062bdcdf89199eb5d7a33da33b; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < 75eec935444db4af2123e0491936f6e273d7ea00; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < 384b4dae14277d369221d187e9b3af56c79d2e50; >= f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e, < e0ba936287dfe9783426aac27e5fd76fe35b38c9
LinuxLinux3.7

References

Timeline

Published
Last Modified
Status
Received

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.
How severe is CVE-2026-74669?
Severity scoring for CVE-2026-74669 is pending analysis.
How do I fix CVE-2026-74669?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST