netfilter: nft_ct: drop pending enqueued packets on removal

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: drop pending enqueued packets on removal Packets sitting in nfqueue might hold a reference to: • templates that specify the conntrack zone, because a percpu area is used and module removal is possible. • conntrack timeout policies and helper, where object removal leave a stale reference. Since these objects can just go away, drop enqueued packets to avoid stale reference to them. If there is a need for finer grain removal, this logic can be revisited to make selective packet drop upon dependencies.

Timeline

1. May 5, 2026, 3:17 PM UTCCVE published
2. Oct 16, 2026, 3:14 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 7:06 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in 8a64e76933672b08bd85b63086f33432070fd729; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in 3da0b946835f33bf36b459ead764c61a761e689b; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in ab50302190b303f847c4eba0e31a01a56dec596e; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in e68a8db3a0546482b34e9ca5ca886bcf73eb37bb; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in 6802ff8beceb9c4254318e81c1395720438f2cc2; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in f29a055e4f593e577805b41228b142b58f48df1b; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in 77da55dee67720e2b8d2db49a53334e6c017ee7b; From 7e0b2b57f01d183e1c84114f1f2287737358d748 · fixed in 36eae0956f659e48d5366d9b083d9417f3263ddc

• Linux Linux

  4.19

• KernelLinux

  From 4.19.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.20; From 6.19.0 · fixed in 6.19.10

References 8