CVE-2026-74724
In the Linux kernel, the following vulnerability has been resolved:
ipvs: avoid out-of-bounds write in ip_vs_nat_icmp
Sashiko warns that local attacker can modify the packet
while it is processed by IPVS. Some places read the
IP ihl field multiple times which can cause out-of-bounds
access. One such place is ip_vs_nat_icmp where we
can write after the validated area.
Fix it by providing ciph argument just like it is done for
IPv6 and use ciph->len as offset to the embedded transport
header.
Modify some IPv4 header checks by reading the ihl field
only once.
CSIRTS triage
- What
- The ipvs NAT ICMP handler performs an out-of-bounds write when processing certain packets.
- Who is affected
- Systems running affected Linux kernel versions with IPVS load balancing enabled.
- Urgency
- Medium severity (CVSS 6.3); not currently exploited but enables denial of service or memory corruption.
- Action
- Update to a patched Linux kernel version addressing CVE-2026-74724 or disable IPVS if not needed.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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