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Allocation of Resources Without Limits or Throttling The advisory has been revoked - it doesn't affect any version of package kernel-rt-kvm  (opens in a new tab)

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  • Snyk IDSNYK-CENTOS10-KERNELRTKVM-16730302
  • published17 May 2026
  • disclosed8 May 2026
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Introduced: 8 May 2026

CVE-2026-43329  (opens in a new tab)
CWE-770  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: flowtable: strictly check for maximum number of actions

The maximum number of flowtable hardware offload actions in IPv6 is:

  • ethernet mangling (4 payload actions, 2 for each ethernet address)
  • SNAT (4 payload actions)
  • DNAT (4 payload actions)
  • Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing) for QinQ.
  • Redirect (1 action)

Which makes 17, while the maximum is 16. But act_ct supports for tunnels actions too. Note that payload action operates at 32-bit word level, so mangling an IPv6 address takes 4 payload actions.

Update flow_action_entry_next() calls to check for the maximum number of supported actions.

While at it, rise the maximum number of actions per flow from 16 to 24 so this works fine with IPv6 setups.

References