{"id":"CVE-2026-64189","state":"PUBLISHED","title":"netfilter: ipset: fix race between dump and ip_set_list resize","description":"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","publishedAt":"2026-07-20T16:27:47.767Z","updatedAt":"2026-10-19T20:28:14.906Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"a7a299277959683204d73333c32c092fd69327d4","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"1bc67c3fc98e9fc07032cc56afcdbc690c47d11e","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"96fbafc20ebd9a613736c2998b89c539fe3042f5","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"ff86ea9b7fdf70564e60436fbee68c96bc459943","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"81d54c766337b923eec26da0a13406760b091093","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"e8ee198bbc04a32d336e79160fde980e0235b39f","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"7cd9103283b26b917360ec99d7d2f2d761bcf1ab","versionType":"git"},{"version":"2f6bf7917f55f9dae913193e49672b3598620eab","status":"affected","versionType":"git"},{"version":"4.19.5","status":"affected","lessThan":"4.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_core.c"]}],"references":["https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4","https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e","https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710","https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5","https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943","https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093","https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f","https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64189.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64189","state":"PUBLISHED","datePublished":"2026-07-20T16:27:47.767Z","dateUpdated":"2026-10-19T20:28:14.906Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.040Z"},"containers":{"cna":{"title":"netfilter: ipset: fix race between dump and ip_set_list resize","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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"a7a299277959683204d73333c32c092fd69327d4","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"1bc67c3fc98e9fc07032cc56afcdbc690c47d11e","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"96fbafc20ebd9a613736c2998b89c539fe3042f5","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"ff86ea9b7fdf70564e60436fbee68c96bc459943","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"81d54c766337b923eec26da0a13406760b091093","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"e8ee198bbc04a32d336e79160fde980e0235b39f","versionType":"git"},{"version":"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7","status":"affected","lessThan":"7cd9103283b26b917360ec99d7d2f2d761bcf1ab","versionType":"git"},{"version":"2f6bf7917f55f9dae913193e49672b3598620eab","status":"affected","versionType":"git"},{"version":"4.19.5","status":"affected","lessThan":"4.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_core.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:51:49.683Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64189","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:37:21.088699Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:28:14.906Z"}}]}}}