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CVE-2026-74669

ipvs: clear IPv4 options after rebasing tunnel ICMP errors

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in 79ffa99202c944467e28b13b513bf2998732edff; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in c9413b50204738fbc429bb86bf01353c393a6c28; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in 37c61b3745129cbd682c557b51345828120972e5; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in ed246dd85ebf27c1f6b7897834d40786c0ca3006; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in 6f46fc460e9316062bdcdf89199eb5d7a33da33b; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in 75eec935444db4af2123e0491936f6e273d7ea00; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in 384b4dae14277d369221d187e9b3af56c79d2e50; From f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e · fixed in e0ba936287dfe9783426aac27e5fd76fe35b38c9

  • Linux Linux

    3.7

  • KernelLinux

    From 3.7.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.152; From 6.7.0 · fixed in 6.12.104; From 6.13.0 · fixed in 6.18.45; From 6.19.0 · fixed in 7.1.9

References 8

git.kernel.org