CVE-2026-64189 (GCVE-0-2026-64189)
Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-10-16 15:42
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:37 UTC
Assigner
References
8 references
Impacted products
2 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) |
guessed | |
| 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) |
guessed |
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}
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"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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"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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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.