CVE-2026-64189 (GCVE-0-2026-64189)
Vulnerability from cvelistv5
Published
2026-07-20 16:27
Modified
2026-10-19 20:28
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7
Version: 2f6bf7917f55f9dae913193e49672b3598620eab
Version: 4.19.5   ≤
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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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"net/netfilter/ipset/ip_set_core.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/ipset/ip_set_core.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:51:49.683Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64189\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:28:14.906Z\", \"dateReserved\": \"2026-07-19T07:54:57.040Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-20T16:27:47.767Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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