{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80714", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.788Z", "datePublished": "2026-08-28T06:53:13.069Z", "dateUpdated": "2026-10-16T19:26:34.808Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:30.808Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: do not propagate one-packet flag to synced conns\n\nSynced connections can be created before their destination exists. When\nthe destination is later added, ip_vs_bind_dest() copies connection flags\nfrom the destination into cp->flags.\n\nIP_VS_CONN_F_ONE_PACKET connections are not synced. If a synced\nconnection inherits IP_VS_CONN_F_ONE_PACKET while it is already hashed,\nexpiry can treat it as a one-packet connection and skip unlinking the\nexisting conn_tab node, leaving stale hash nodes pointing at a freed\nstruct ip_vs_conn.\n\nDrop IP_VS_CONN_F_ONE_PACKET from destination flags when binding synced\nconnections." } ], "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 reached on IPVS backup nodes processing UDP sync datagrams in ip_vs_process_message()/ip_vs_proc_conn() (default multicast 224.0.0.81:8848), and on internet-facing load balancers client UDP traffic drives master sync that creates the hashed backup connection before destination bind.\nAC:L - An attacker can reliably inject or refresh IPVS sync records for UDP connections whose destination is not yet present, then trigger ip_vs_try_bind_dest() once a ONEPACKET destination exists; only optional syncid filtering (often 0) is outside attacker control, and connection expiry is timer-driven without a race.\nPR:N - The backup sync receiver accepts unauthenticated UDP multicast with no capability checks in ip_vs_receive()/ip_vs_process_message(); configuring IPVS/ONEPACKET is an environmental precondition on HA load balancers, not a privilege the remote attacker must hold on the victim host.\nUI:N - Exploitation requires no victim or administrator action at trigger time beyond normal HA IPVS operation; forged or reflected sync traffic and subsequent connection expiry directly invoke the vulnerable bind/unlink path without user interaction.\nS:U - Impact is confined to the kernel IPVS connection table on the affected load-balancer node (stale hash entries to a freed struct ip_vs_conn); it does not cross a VM, container, or IOMMU security boundary.\nC:H - Incorrect ONE_PACKET handling leaves hashed conn_tab nodes pointing at a freed struct ip_vs_conn; subsequent lookups in __ip_vs_conn_in_get() dereference freed slab memory, giving a use-after-free read primitive and potential kernel pointer/data disclosure.\nI:H - The same use-after-free lets attackers influence reuse of the freed ip_vs_conn object and corrupt connection state during later hash-table operations, enabling memory corruption exploitable for arbitrary kernel writes or control-flow hijacking.\nA:H - Dereferencing stale conn_tab entries for a freed connection causes kernel oops/panic; the condition is repeatable by sending additional sync traffic to recreate and expire affected UDP synced connections on the backup node." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/ipvs/ip_vs_conn.c" ], "versions": [ { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "06d1d9b56ef8132fbf85006885eb43d9510b8b02", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "acbdc276091b308ca7794acb86e761f8203e2f59", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "300348e3ba1521b003d59825f97e24f9a6859688", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "44af98cc7d5ef8e730488d5df1eecd5deeaa5947", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "4649e6faeecdc2d44bfa6ccbe405eef27e55d816", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "b5ee5b266f833601ac4817f6df0bc496fc376a28", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "e7acfc990c29890c883d0d0ce3f737d003a43b44", "status": "affected", "versionType": "git" }, { "version": "26ec037f9841e49cc5c615deb8e1e73e5beab2ca", "lessThan": "a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b", "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/ipvs/ip_vs_conn.c" ], "versions": [ { "version": "2.6.36", "status": "affected" }, { "version": "0", "lessThan": "2.6.36", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "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": "2.6.36", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.36", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/06d1d9b56ef8132fbf85006885eb43d9510b8b02" }, { "url": "https://git.kernel.org/stable/c/acbdc276091b308ca7794acb86e761f8203e2f59" }, { "url": "https://git.kernel.org/stable/c/300348e3ba1521b003d59825f97e24f9a6859688" }, { "url": "https://git.kernel.org/stable/c/44af98cc7d5ef8e730488d5df1eecd5deeaa5947" }, { "url": "https://git.kernel.org/stable/c/4649e6faeecdc2d44bfa6ccbe405eef27e55d816" }, { "url": "https://git.kernel.org/stable/c/b5ee5b266f833601ac4817f6df0bc496fc376a28" }, { "url": "https://git.kernel.org/stable/c/e7acfc990c29890c883d0d0ce3f737d003a43b44" }, { "url": "https://git.kernel.org/stable/c/a63d2dbaeb50a85d4c976b15a36e6b0c7113db5b" } ], "title": "ipvs: do not propagate one-packet flag to synced conns", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80714", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:20:40.726937Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:34.808Z" } } ] } }