High 7.8Published Jul 20, 2026

CVE-2026-64189netfilter: ipset: fix race between dump and ip_set_list resize

Updated under an hour ago (Oct 26, 2026, 10:40 PM ET)

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Exploited in the last 30 days

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

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 before a7a299277959683204d73333c32c092fd69327d4; 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 builds before 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e; from 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 before e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710; from 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 before 96fbafc20ebd9a613736c2998b89c539fe3042f5; from 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 before ff86ea9b7fdf70564e60436fbee68c96bc459943; from 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 before 81d54c766337b923eec26da0a13406760b091093; from 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 before e8ee198bbc04a32d336e79160fde980e0235b39f; 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 builds before 7cd9103283b26b917360ec99d7d2f2d761bcf1ab; and 2 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 4.19.5 before 4.20; from 4.20.1 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; and 8 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4	patch
https://git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e	patch
https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710	patch
https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5	patch
https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943	patch
https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093	patch
https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f	patch
https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.