CVE-2026-74565

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per kernel CNA guidance, nf_tables/netlink is Local, not network-reachable packet processing.\nAC:L - The attacker controls both sides of the race by running concurrent Netlink sockets\u2014one closing to fire nft_rcv_nl_event()/__nft_release_table() object teardown and another issuing object lookups/commits\u2014and can retry until the global rhltable collision-chain walk hits freed memory.\nPR:L - All nf_tables Netlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(); CAP_NET_ADMIN is obtainable by an unprivileged user inside a user+network namespace (unshare -Urn), not requiring init-namespace root.\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through their own nftables Netlink operations and socket close events without another user mounting, opening files, or taking any action.\nS:U - Impact is kernel heap use-after-free and potential local privilege escalation within the same kernel security authority; this is standard in-kernel memory corruption, not a distinct VM-guest-to-host or sandbox-boundary escape.\nC:H - nft_obj_lookup() holds rcu_read_lock and walks the global rhltable collision chain, dereferencing struct nft_object fields (key.table, ops, genmask) that nft_obj_destroy() may have already kfree'd, giving arbitrary kernel memory read potential from UAF.\nI:H - Immediate kfree after rhltable_remove without waiting for RCU readers enables classic slab UAF heap corruption that can be groomed into arbitrary kernel writes, control-flow hijacking, and local privilege escalation beyond a bounded or transient fault.\nA:H - Concurrent destruction via nft_rcv_nl_event() and active nft_obj_lookup() reliably provokes KASAN-class slab use-after-free kernel oops/panic during rhlist traversal; UAF is inherently crash-prone even when not fully weaponized for code execution."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_tables.h", "net/netfilter/nf_tables_api.c"], "versions": [{"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "4b549d32d34ee765527e63726bb1af984876e776", "status": "affected", "versionType": "git"}, {"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "523c881661dde67efb44fce38c8eed50a72a57c1", "status": "affected", "versionType": "git"}, {"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "71714a2cec6c6d79bbd425ad968f9d6a3e4a2066", "status": "affected", "versionType": "git"}, {"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "1948e4f85b855618b5b9a27265f98d816f4cb7cb", "status": "affected", "versionType": "git"}, {"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "63ba12b664a2cd3220ed43e22c717715f4cc2ae8", "status": "affected", "versionType": "git"}, {"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af", "status": "affected", "versionType": "git"}, {"version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "f4f699790590bd0896c48a71e9232a65198f92f0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_tables.h", "net/netfilter/nf_tables_api.c"], "versions": [{"version": "5.1", "status": "affected"}, {"version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.1", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4b549d32d34ee765527e63726bb1af984876e776"}, {"url": "https://git.kernel.org/stable/c/523c881661dde67efb44fce38c8eed50a72a57c1"}, {"url": "https://git.kernel.org/stable/c/71714a2cec6c6d79bbd425ad968f9d6a3e4a2066"}, {"url": "https://git.kernel.org/stable/c/1948e4f85b855618b5b9a27265f98d816f4cb7cb"}, {"url": "https://git.kernel.org/stable/c/63ba12b664a2cd3220ed43e22c717715f4cc2ae8"}, {"url": "https://git.kernel.org/stable/c/7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af"}, {"url": "https://git.kernel.org/stable/c/f4f699790590bd0896c48a71e9232a65198f92f0"}], "title": "netfilter: nf_tables: make nft_object rhltable per table", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74565", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:00:18.619077Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:56.221Z"}}]}}

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network-reachable packet processing.\nAC:L - The attacker controls both sides of the race by running concurrent Netlink sockets\u2014one closing to fire nft_rcv_nl_event()/__nft_release_table() object teardown and another issuing object lookups/commits\u2014and can retry until the global rhltable collision-chain walk hits freed memory.\nPR:L - All nf_tables Netlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(); CAP_NET_ADMIN is obtainable by an unprivileged user inside a user+network namespace (unshare -Urn), not requiring init-namespace root.\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through their own nftables Netlink operations and socket close events without another user mounting, opening files, or taking any action.\nS:U - Impact is kernel heap use-after-free and potential local privilege escalation within the same kernel security authority; this is standard in-kernel memory corruption, not a distinct VM-guest-to-host or sandbox-boundary escape.\nC:H - nft_obj_lookup() holds rcu_read_lock and walks the global rhltable collision chain, dereferencing struct nft_object fields (key.table, ops, genmask) that nft_obj_destroy() may have already kfree'd, giving arbitrary kernel memory read potential from UAF.\nI:H - Immediate kfree after rhltable_remove without waiting for RCU readers enables classic slab UAF heap corruption that can be groomed into arbitrary kernel writes, control-flow hijacking, and local privilege escalation beyond a bounded or transient fault.\nA:H - Concurrent destruction via nft_rcv_nl_event() and active nft_obj_lookup() reliably provokes KASAN-class slab use-after-free kernel oops/panic during rhlist traversal; UAF is inherently crash-prone even when not fully weaponized for code execution."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "4b549d32d34ee765527e63726bb1af984876e776", "versionType": "git"}, {"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "523c881661dde67efb44fce38c8eed50a72a57c1", "versionType": "git"}, {"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "71714a2cec6c6d79bbd425ad968f9d6a3e4a2066", "versionType": "git"}, {"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "1948e4f85b855618b5b9a27265f98d816f4cb7cb", "versionType": "git"}, {"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "63ba12b664a2cd3220ed43e22c717715f4cc2ae8", "versionType": "git"}, {"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", "lessThan": "7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af", "versionType": "git"}, {"status": "affected", "version": "4d44175aa5bb5f68772b1eb0306554812294ca52", 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"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: make nft_object rhltable per table\n\nThe nft_object rhltable is global, this allows for accessing objects\nthat are being dismangled from lookup path by other existing netns.\nGiven the nft_obj_destroy() releases the object inmediately, this might\nlead to use-after-free of these objects that are being released.\nMake the existing rhltable per table to address this issue to deal with\nwith the nft_rcv_nl_event() path too.\n\nUpdate nft_obj_lookup() to take the table as non-const, otherwise,\ncompiler complains when passing the objname_ht to rhltable_lookup()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", 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"dateUpdated": "2026-10-21T12:45:59.495Z", "dateReserved": "2026-08-15T05:44:03.916Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T12:28:07.015Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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released.\nMake the existing rhltable per table to address this issue to deal with\nwith the nft_rcv_nl_event() path too.\n\nUpdate nft_obj_lookup() to take the table as non-const, otherwise,\ncompiler complains when passing the objname_ht to rhltable_lookup()."}], "id": "CVE-2026-74565", "lastModified": "2026-10-21T13:19:47.337", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74565", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:00:18.619077Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:18:02.013", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1948e4f85b855618b5b9a27265f98d816f4cb7cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b549d32d34ee765527e63726bb1af984876e776"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/523c881661dde67efb44fce38c8eed50a72a57c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63ba12b664a2cd3220ed43e22c717715f4cc2ae8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/71714a2cec6c6d79bbd425ad968f9d6a3e4a2066"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f4f699790590bd0896c48a71e9232a65198f92f0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: netfilter: nf_tables: make nft_object rhltable per table", "id": "2517088", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517088"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's netfilter subsystem. The global nature of the `nft_object rhltable` allows a local attacker to access objects that are being deallocated by other network namespaces. This can lead to a use-after-free vulnerability, potentially resulting in memory corruption or denial of service."], "name": "CVE-2026-74565", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74565\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74565\nhttps://lore.kernel.org/linux-cve-announce/2026081553-CVE-2026-74565-74d6@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d44175aa5bb5f68772b1eb0306554812294ca52,1948e4f85b855618b5b9a27265f98d816f4cb7cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d44175aa5bb5f68772b1eb0306554812294ca52,63ba12b664a2cd3220ed43e22c717715f4cc2ae8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d44175aa5bb5f68772b1eb0306554812294ca52,7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d44175aa5bb5f68772b1eb0306554812294ca52,f4f699790590bd0896c48a71e9232a65198f92f0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T15:00:04.340364+00:00", "updated": "2026-08-18T03:00:09.674905+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}