chore: containerd v2.3.5 and the nftables masquerade backend - #26
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containerd v2.3.5 carries CVE-2026-53495 and GHSA-rp3h-jf77-q9p4. The bridge conflist now sets ipMasqBackend: nftables and nftables joins the essential packages: with the iptables backend, 100 concurrent container starts on an 8-vCPU node serialize on the xtables lock (~0.55 s each) and the slowest exceed the oci-hook's 60 s CNI timeout, so only 34-41 of 100 come up; with nftables the same 100 start in 9-11 s with none lost (50 in 5.6 s instead of 34 s).
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containerd_versionv2.3.4 → v2.3.5 (CVE-2026-53495, GHSA-rp3h-jf77-q9p4, shim load/delete fixes). The lane's containerd node was upgraded the same way (release tarball, checksum verified) and passes the containerd e2e set.ipMasqBackend: nftablesandnftablesjoins the essential packages (the bridge plugin drivesnftfor outbound NAT). With the iptables backend, 100 concurrent container starts on an 8-vCPU node serialize on the xtables lock (~0.55 s each) and the slowest exceed the oci-hook's 60 s CNI timeout, so only 32–41 of 100 come up; with nftables the same 100 start in 9–11 s with none lost and 50 start in 5.6 s instead of 34–43 s (two interleaved rounds on the lane, core v0.1.4 and perf: bound the creates in flight on one node core#735 both).