{"api_version":"1","generated_at":"2026-08-22T09:16:42+00:00","cve":"CVE-2026-74260","urls":{"html":"https://cve.report/CVE-2026-74260","api":"https://cve.report/api/cve/CVE-2026-74260.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74260","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74260"},"summary":{"title":"netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them\n\nUpdate nft_dup and nft_fwd to use the nf_dev_xmit_recursion() helpers.\nThis patch also disables BH when transmitting the skb to address a\npossible migration to different CPU leading to imbalanced decrementation\nof the recursion counters.\n\nThis is modeled after Florian Westphal's dev_xmit_recursion*() API\navailable since commit 97cdcf37b57e (\"net: place xmit recursion in\nsoftnet data\") according to its current state in the tree.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:25","updated_at":"2026-08-17 06:19:19"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/edf234f71fb327792196f813048ab8f5bd3bb712","name":"https://git.kernel.org/stable/c/edf234f71fb327792196f813048ab8f5bd3bb712","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2354e975932dabb06fad239f07a3b68fd1809737","name":"https://git.kernel.org/stable/c/2354e975932dabb06fad239f07a3b68fd1809737","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74260","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74260","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f37ad91270397a6d053e8623bdb3cf79859691d2 edf234f71fb327792196f813048ab8f5bd3bb712 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f37ad91270397a6d053e8623bdb3cf79859691d2 2354e975932dabb06fad239f07a3b68fd1809737 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74260","cve":"CVE-2026-74260","epss":"0.001540000","percentile":"0.050510000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/netfilter/nf_dup_netdev.h","net/netfilter/nf_dup_netdev.c","net/netfilter/nft_fwd_netdev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"edf234f71fb327792196f813048ab8f5bd3bb712","status":"affected","version":"f37ad91270397a6d053e8623bdb3cf79859691d2","versionType":"git"},{"lessThan":"2354e975932dabb06fad239f07a3b68fd1809737","status":"affected","version":"f37ad91270397a6d053e8623bdb3cf79859691d2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/netfilter/nf_dup_netdev.h","net/netfilter/nf_dup_netdev.c","net/netfilter/nft_fwd_netdev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.16"},{"lessThan":"6.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them\n\nUpdate nft_dup and nft_fwd to use the nf_dev_xmit_recursion() helpers.\nThis patch also disables BH when transmitting the skb to address a\npossible migration to different CPU leading to imbalanced decrementation\nof the recursion counters.\n\nThis is modeled after Florian Westphal's dev_xmit_recursion*() API\navailable since commit 97cdcf37b57e (\"net: place xmit recursion in\nsoftnet data\") according to its current state in the tree."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached through nftables netdev fwd/dup evaluation on NF_NETDEV ingress/egress hooks installed via nfnetlink; kernel CNA guidance treats netfilter/nftables configuration and packet-hook paths as Local even when traffic ultimately arrives from the network.\nAC:L - An attacker with CAP_NET_ADMIN can deterministically install netdev egress/ingress fwd or dup rules that loop (same device or mutual forwarding) and drive packets through them; concurrent traffic also lets the attacker influence CPU migration that desynchronizes the per-CPU recursion counter without uncontrollable races.\nPR:L - Installing netdev nftables fwd/dup rules requires CAP_NET_ADMIN via nfnetlink (netlink_net_capable), but that capability is routinely obtainable in an unprivileged-created user+network namespace (unshare -Urn) and is commonly delegated to containers with NET_ADMIN.\nUI:N - Exploitation needs only the attacker's own nftables/netlink setup and packet injection; no victim must mount filesystems, open files, click prompts, or perform any deliberate interactive action beyond ordinary traffic delivery.\nS:U - Impact is unbounded kernel-stack recursion and crash/panic within the same kernel security domain; it does not cross a VM, container, IOMMU, or other distinct security-authority boundary such as guest-to-host escape.\nC:H - Bypassing the nf_dup_skb_recursion limit allows unbounded nf_hook_egress/ingress re-entry that corrupts kernel stack frames before the guard page; such stack corruption can disclose adjacent kernel memory and is not a pure NULL-deref crash with no data exposure.\nI:H - Unbounded recursion overflows the kernel task stack and overwrites saved return addresses/control data on the stack, providing a standard path to arbitrary kernel writes and control-flow hijack rather than a bounded or crash-only integrity effect.\nA:H - When the per-CPU recursion counter is desynchronized by CPU migration without local_bh_disable(), fwd/dup netdev rules can recurse without bound through neigh_xmit/dev_queue_xmit and nf_hook_egress, exhausting the kernel stack and causing oops/panic."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:45:09.808Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/edf234f71fb327792196f813048ab8f5bd3bb712"},{"url":"https://git.kernel.org/stable/c/2354e975932dabb06fad239f07a3b68fd1809737"}],"title":"netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74260","datePublished":"2026-08-15T05:57:37.579Z","dateReserved":"2026-08-15T05:44:03.877Z","dateUpdated":"2026-08-17T05:45:09.808Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:25","lastModifiedDate":"2026-08-17 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helpers.\nThis patch also disables BH when transmitting the skb to address a\npossible migration to different CPU leading to imbalanced decrementation\nof the recursion counters.\n\nThis is modeled after Florian Westphal's dev_xmit_recursion*() API\navailable since commit 97cdcf37b57e (\"net: place xmit recursion in\nsoftnet data\") according to its current state in the tree.","Type":"Description","Title":"netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers a"}]}}}