{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64150","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.037Z","datePublished":"2026-07-19T15:40:40.027Z","dateUpdated":"2026-08-05T12:39:44.813Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:39:44.813Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: release local_lock before re-enabling softirqs\n\nQuoting sashiko:\n In the error path, local_bh_enable() is called before\n local_unlock_nested_bh()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The bug is hit during packet evaluation in netfilter hooks (prerouting/forward/input) when tunneled traffic (GRE/UDP/Geneve) matching admin-deployed `inner` rules is processed; remote packets reach `nft_inner_restore_tun_ctx()` without any local syscall.\nAC:L - An attacker can reliably provoke the cookie-mismatch error path by sending concurrent tunneled packets through an `inner`-enabled chain, controlling both sides of the per-CPU context race; no attacker-uncontrollable memory layout or rare timing is required.\nPR:N - Exploitation requires only the ability to send network packets to a host whose nftables rules already include `inner` expressions (typical on cloud NFV/firewall gateways); no local account, capability, or user-namespace `CAP_NET_ADMIN` is needed by the remote attacker.\nUI:N - No victim interaction beyond normal network traffic delivery to a host running nftables tunnel-inspection rules; the attacker does not need the victim to open files, mount filesystems, or take any deliberate action.\nS:U - Impact is confined to kernel netfilter/nftables processing on the target host; it does not cross VM, container, or IOMMU security boundaries to affect separate security authorities.\nC:H - Re-enabling softirqs before releasing the nested-BH lock breaks serialization of the per-CPU `nft_pcpu_tun_ctx`, allowing concurrent corruption of inner header offsets that `nft_payload_inner_eval()` uses in `skb_copy_bits()`, yielding out-of-bounds kernel memory reads.\nI:H - The same unsynchronized per-CPU state corruption can desynchronize inner parsing metadata and, on PREEMPT_RT, leave a per-CPU spinlock held across softirq re-entry causing deadlock; memory corruption of parsing state is exploitable for further control of packet-processing behavior.\nA:H - On PREEMPT_RT kernels the inverted unlock/BH ordering leaves the per-CPU spinlock held while softirqs run, causing softirq handlers to block on the same lock and producing CPU deadlock or soft lockup; non-RT paths can also crash or hang from the resulting race."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nft_inner.c"],"versions":[{"version":"ba36fada9ab487634f61f92769c95bc148aa8f49","lessThan":"df19b6af171695a1352314597c9a4311d48d5171","status":"affected","versionType":"git"},{"version":"ba36fada9ab487634f61f92769c95bc148aa8f49","lessThan":"6fecd39c6401134b58505bc4eb1adc8a0e2fe992","status":"affected","versionType":"git"},{"version":"ba36fada9ab487634f61f92769c95bc148aa8f49","lessThan":"a6cb3ff979855f7f0ee9450a947fe8f96c2ba37a","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nft_inner.c"],"versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.18.34","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.11","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/df19b6af171695a1352314597c9a4311d48d5171"},{"url":"https://git.kernel.org/stable/c/6fecd39c6401134b58505bc4eb1adc8a0e2fe992"},{"url":"https://git.kernel.org/stable/c/a6cb3ff979855f7f0ee9450a947fe8f96c2ba37a"}],"title":"netfilter: nft_inner: release local_lock before re-enabling softirqs","x_generator":{"engine":"bippy-1.2.0"}}}}