{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64189", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.040Z", "datePublished": "2026-07-20T16:27:47.767Z", "dateUpdated": "2026-08-17T04:51:49.683Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:51:49.683Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: fix race between dump and ip_set_list resize\n\nThe release path of ip_set_dump_do() and ip_set_dump_done() read\ninst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw()\nof the array pointer. These run from netlink_recvmsg() without the nfnl\nmutex and without an RCU read-side critical section.\n\nA concurrent ip_set_create() can grow the array: it publishes the new\narray, calls synchronize_net() and then kvfree()s the old one. Since the\ndump paths read the array outside any RCU reader, synchronize_net() does\nnot wait for them and the old array can be freed while they still index\ninto it, causing a use-after-free.\n\nThe dumped set itself stays pinned via set->ref_netlink, so only the\narray load needs protecting. Take rcu_read_lock() around it, matching\nip_set_get_byname() and __ip_set_put_byindex().\n\n BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697)\n Read of size 8 at addr ffff88800b5c4018 by task exploit/150\n Call Trace:\n ...\n kasan_report (mm/kasan/report.c:595)\n ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697)\n netlink_dump (net/netlink/af_netlink.c:2325)\n netlink_recvmsg (net/netlink/af_netlink.c:1976)\n sock_recvmsg (net/socket.c:1159)\n __sys_recvfrom (net/socket.c:2315)\n ...\n Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI\n KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7]\n RIP: 0010:ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1698)\n Kernel panic - not syncing: Fatal exception" } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable dump and resize paths are reached through local NETLINK_NETFILTER send and receive syscalls, not through remotely received packets.\nAC:L - The attacker controls both sides by issuing an ipset dump and concurrent CREATE requests that grow ip_set_list, and can repeat the race without any victim-controlled condition.\nPR:L - NFNETLINK requires CAP_NET_ADMIN in the network namespace's owning user namespace, which an unprivileged user can obtain through user and network namespaces on deployments permitting unprivileged user namespaces.\nUI:N - After obtaining local execution, the attacker can trigger both racing operations without any action by another user.\nS:U - Exploitation compromises the kernel of the same host and constitutes standard local privilege escalation rather than crossing a VM, hypervisor, or IOMMU boundary.\nC:H - Reclaiming the freed array can make the loaded struct ip_set pointer attacker-influenced, after which variant-pointer dereferences can enable kernel code execution and arbitrary memory disclosure.\nI:H - The release path performs an indirect uref callback and decrements ref_netlink through the stale pointer, providing control-flow and kernel-memory-write opportunities after heap reclamation.\nA:H - The reported use-after-free produced a general-protection fault and kernel panic, and an attacker can trigger the race repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/ipset/ip_set_core.c" ], "versions": [ { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "a7a299277959683204d73333c32c092fd69327d4", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "1bc67c3fc98e9fc07032cc56afcdbc690c47d11e", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "96fbafc20ebd9a613736c2998b89c539fe3042f5", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "ff86ea9b7fdf70564e60436fbee68c96bc459943", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "81d54c766337b923eec26da0a13406760b091093", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "e8ee198bbc04a32d336e79160fde980e0235b39f", "status": "affected", "versionType": "git" }, { "version": "8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7", "lessThan": "7cd9103283b26b917360ec99d7d2f2d761bcf1ab", "status": "affected", "versionType": "git" }, { "version": "2f6bf7917f55f9dae913193e49672b3598620eab", "status": "affected", "versionType": "git" }, { "version": "4.19.5", "lessThan": "4.20", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/ipset/ip_set_core.c" ], "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "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": "4.20", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4" }, { "url": "https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e" }, { "url": "https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710" }, { "url": "https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5" }, { "url": "https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943" }, { "url": "https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093" }, { "url": "https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f" }, { "url": "https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab" } ], "title": "netfilter: ipset: fix race between dump and ip_set_list resize", "x_generator": { "engine": "bippy-1.2.0" } } } }