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CVE-2026-64189 (GCVE-0-2026-64189)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-08-17 04:51
VLAI
Title
netfilter: ipset: fix race between dump and ip_set_list resize
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: fix race between dump and ip_set_list resize The release path of ip_set_dump_do() and ip_set_dump_done() read inst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw() of the array pointer. These run from netlink_recvmsg() without the nfnl mutex and without an RCU read-side critical section. A concurrent ip_set_create() can grow the array: it publishes the new array, calls synchronize_net() and then kvfree()s the old one. Since the dump paths read the array outside any RCU reader, synchronize_net() does not wait for them and the old array can be freed while they still index into it, causing a use-after-free. The dumped set itself stays pinned via set->ref_netlink, so only the array load needs protecting. Take rcu_read_lock() around it, matching ip_set_get_byname() and __ip_set_put_byindex(). BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) Read of size 8 at addr ffff88800b5c4018 by task exploit/150 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) netlink_dump (net/netlink/af_netlink.c:2325) netlink_recvmsg (net/netlink/af_netlink.c:1976) sock_recvmsg (net/socket.c:1159) __sys_recvfrom (net/socket.c:2315) ... Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7] RIP: 0010:ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1698) Kernel panic - not syncing: Fatal exception
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < a7a299277959683204d73333c32c092fd69327d4 (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < 96fbafc20ebd9a613736c2998b89c539fe3042f5 (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < ff86ea9b7fdf70564e60436fbee68c96bc459943 (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < 81d54c766337b923eec26da0a13406760b091093 (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < e8ee198bbc04a32d336e79160fde980e0235b39f (git)
Affected: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 , < 7cd9103283b26b917360ec99d7d2f2d761bcf1ab (git)
Affected: 2f6bf7917f55f9dae913193e49672b3598620eab (git)
Affected: 4.19.5 , < 4.20 (semver)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "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-\u003eip_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-\u003eref_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"
        }
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            "version": "3.1"
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              "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\u0027s 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."
            }
          ]
        }
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        "dateUpdated": "2026-08-17T04:51:49.683Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5"
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        {
          "url": "https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943"
        },
        {
          "url": "https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093"
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        {
          "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",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64189",
    "datePublished": "2026-07-20T16:27:47.767Z",
    "dateReserved": "2026-07-19T07:54:57.040Z",
    "dateUpdated": "2026-08-17T04:51:49.683Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64189",
      "date": "2026-09-05",
      "epss": "0.00097",
      "percentile": "0.00803"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-10T01:41:46.000Z",
      "cve": "CVE-2026-64189",
      "id": "msrc_CVE-2026-64189",
      "initial_release_date": "2026-07-22T01:02:03.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "netfilter: ipset: fix race between dump and ip_set_list resize",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64189.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64189\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-20T17:18:21.997\",\"lastModified\":\"2026-08-17T05:17:21.870\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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-\u003eip_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-\u003eref_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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/ipset/ip_set_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"a7a299277959683204d73333c32c092fd69327d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"1bc67c3fc98e9fc07032cc56afcdbc690c47d11e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"96fbafc20ebd9a613736c2998b89c539fe3042f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"ff86ea9b7fdf70564e60436fbee68c96bc459943\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"81d54c766337b923eec26da0a13406760b091093\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"e8ee198bbc04a32d336e79160fde980e0235b39f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7\",\"lessThan\":\"7cd9103283b26b917360ec99d7d2f2d761bcf1ab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2f6bf7917f55f9dae913193e49672b3598620eab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.19.5\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/ipset/ip_set_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.20\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.5\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"D3B845C6-54F5-4255-A232-8EBB7EF7AB26\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20.1\",\"versionEndExcluding\":\"5.10.261\",\"matchCriteriaId\":\"924FC25F-553B-49BE-8033-58005A70BB19\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.212\",\"matchCriteriaId\":\"8E99FB01-CD93-41AF-A653-3F450652B9A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.178\",\"matchCriteriaId\":\"092233C7-F4E0-40C8-BD4D-A28FE50DFE20\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.145\",\"matchCriteriaId\":\"7046B092-F810-4440-ACE6-60218518EECE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_ke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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T14:16:44+00:00",
      "cve": "CVE-2026-64189",
      "id": "CVE-2026-64189",
      "initial_release_date": "2026-07-20T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "29",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: ipset: fix race between dump and ip_set_list resize",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64189.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T16:29:55Z",
      "cve": "CVE-2026-64189",
      "id": "CVE-2026-64189",
      "initial_release_date": "2026-07-21T12:58:04Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "498",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "507",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64189",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64189.json",
      "version": "18"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.