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.
CSIRTS triage
- What
- A vulnerability in IPVS (IP Virtual Server) where IPv4 options are not cleared after rebasing tunnel ICMP errors, leaking information.
- Who is affected
- Systems running affected Linux kernel versions with IPVS load balancing and tunnel encapsulation enabled.
- Urgency
- High priority; CVSS 7.4 and can leak sensitive IPv4 option data through ICMP error messages in tunneled traffic.
- Action
- Apply Linux kernel patch clearing IPv4 options after rebasing tunnel ICMP errors in IPVS.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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