{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74624", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.921Z", "datePublished": "2026-08-22T15:32:07.193Z", "dateUpdated": "2026-10-16T19:06:02.842Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:47.114Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack: defer invalid log until after unlock\n\nTCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock\nis still held.\n\nWhen invalid logging is routed to nfnetlink_log and conntrack export is\nenabled, the log path can re-enter conntrack netlink glue and dump the\nsame conntrack again. Protocol attribute dumping may take ct->lock, so\nlogging while holding that lock can deadlock.\n\nDefer the TCP invalid logs by storing only the minimal log context while\nct->lock is held and emitting the log after unlocking. Also make the TCP\ntimeout-lowering invalid path return whether a log is needed, then emit\nthat log after unlocking.\n\nDo the same for the SCTP invalid state-transition log that can be reached\nwhile ct->lock is held.\n\nAdd a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers\nthat log invalid conntracks while holding ct->lock are caught outside TCP\nand SCTP as well." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The flaw is hit in nf_conntrack_tcp_packet()/nf_conntrack_sctp_packet() from the NF_INET_PRE_ROUTING and LOCAL_OUT netfilter hooks on received or forwarded TCP/SCTP traffic, so a remote peer can trigger invalid conntrack handling with crafted packets to internet-facing NAT gateways, routers, and servers.\nAC:L - Once nf_conntrack_log_invalid, nflog binding, and NFULNL_CFG_F_CONNTRACK are enabled (the CVE-scoped configuration on monitored firewalls), an attacker deterministically deadlocks by sending invalid-sequence TCP or invalid-state SCTP packets on tracked flows without races or special memory layout.\nPR:N - Triggering the vulnerable conntrack path requires only the ability to send TCP/SCTP packets to a host already running connection tracking with invalid logging; no local account, CAP_NET_ADMIN, or netlink configuration privileges are needed on the attacker side.\nUI:N - Exploitation is driven entirely by network packet delivery and softirq packet processing; no victim must open files, mount filesystems, or perform any interactive action beyond normal network connectivity to the target.\nS:U - The deadlock confines impact to the same kernel networking authority processing the packet; it does not cross VM, container, or IOMMU boundaries to compromise a separate security domain.\nC:N - This is a recursive spinlock deadlock in conntrack invalid logging with no memory corruption, out-of-bounds access, use-after-free, or information-disclosure primitive.\nI:N - The bug causes a lock re-entry hang during logging only; it does not modify kernel or user data, provide arbitrary write primitives, or enable code execution.\nA:H - Re-acquiring ct->lock while it is held deadlocks packet processing on the affected CPU in softirq context, can stall networking on that core, and may escalate to soft lockup or watchdog-induced kernel panic under sustained attack." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_conntrack_proto.c", "net/netfilter/nf_conntrack_proto_sctp.c", "net/netfilter/nf_conntrack_proto_tcp.c" ], "versions": [ { "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd", "lessThan": "ca97360eba4b3dc67f1804625542f4ccc774242a", "status": "affected", "versionType": "git" }, { "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd", "lessThan": "63853eb20bba4e00b7cd0b8cfc19337bbaaf5037", "status": "affected", "versionType": "git" }, { "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd", "lessThan": "9480fcf70a5aa9d320088a01c95df0e5e6391f4a", "status": "affected", "versionType": "git" }, { "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd", "lessThan": "0424186d570aa4d1ad17f516afb86bd9eaa4f42e", "status": "affected", "versionType": "git" }, { "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd", "lessThan": "c0224327b7cbed9d3198e8dbec847281053dcd06", "status": "affected", "versionType": "git" }, { "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd", "lessThan": "2d19b95c9723001f214f7a47d67b09f46238f200", "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/nf_conntrack_proto.c", "net/netfilter/nf_conntrack_proto_sctp.c", "net/netfilter/nf_conntrack_proto_tcp.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "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": "6.1", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ca97360eba4b3dc67f1804625542f4ccc774242a" }, { "url": "https://git.kernel.org/stable/c/63853eb20bba4e00b7cd0b8cfc19337bbaaf5037" }, { "url": "https://git.kernel.org/stable/c/9480fcf70a5aa9d320088a01c95df0e5e6391f4a" }, { "url": "https://git.kernel.org/stable/c/0424186d570aa4d1ad17f516afb86bd9eaa4f42e" }, { "url": "https://git.kernel.org/stable/c/c0224327b7cbed9d3198e8dbec847281053dcd06" }, { "url": "https://git.kernel.org/stable/c/2d19b95c9723001f214f7a47d67b09f46238f200" } ], "title": "netfilter: nf_conntrack: defer invalid log until after unlock", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74624", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:02:43.340591Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:02.842Z" } } ] } }