Critical 9.8Published Aug 22, 2026

CVE-2026-74669ipvs: clear IPv4 options after rebasing tunnel ICMP errors

Updated under an hour ago (Oct 27, 2026, 6:50 AM ET)

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before 79ffa99202c944467e28b13b513bf2998732edff; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before c9413b50204738fbc429bb86bf01353c393a6c28; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before 37c61b3745129cbd682c557b51345828120972e5; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before ed246dd85ebf27c1f6b7897834d40786c0ca3006; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before 6f46fc460e9316062bdcdf89199eb5d7a33da33b; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before 75eec935444db4af2123e0491936f6e273d7ea00; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before 384b4dae14277d369221d187e9b3af56c79d2e50; from f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e before e0ba936287dfe9783426aac27e5fd76fe35b38c9	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.