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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于netfilter:ipset中dump和ip_set_list调整大小之间存在竞争条件，导致释放后重用，可能导致内核崩溃。

CVSS 7.8 · High EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< a7a299277959683204d73333c32c092fd69327d4 affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< 96fbafc20ebd9a613736c2998b89c539fe3042f5 affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< ff86ea9b7fdf70564e60436fbee68c96bc459943 affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< 81d54c766337b923eec26da0a13406760b091093 affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< e8ee198bbc04a32d336e79160fde980e0235b39f affected
8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7< 7cd9103283b26b917360ec99d7d2f2d761bcf1ab affected
… +12 more rows
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I. Basic Information for CVE-2026-64189

Vulnerability Information
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Vulnerability Title
netfilter: ipset: fix race between dump and ip_set_list resize
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于netfilter:ipset中dump和ip_set_list调整大小之间存在竞争条件，导致释放后重用，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 ~ a7a299277959683204d73333c32c092fd69327d4 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-64189

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III. Intelligence Information for CVE-2026-64189

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Patches & Fixes for CVE-2026-64189 (7)

Same Patch Batch · Linux · 2026-07-20 · 9 CVEs total

CVE-2026-64206 8.8 HIGH Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
CVE-2026-64188 7.8 HIGH net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
CVE-2026-64191 7.8 HIGH i2c: stub: Reject I2C block transfers with invalid length
CVE-2026-64187 xfs: fail recovery on a committed log item with no regions
CVE-2026-64190 net: team: fix NULL pointer dereference in team_xmit during mode change
CVE-2026-64192 bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
CVE-2026-64205 i2c: i801: fix hardware state machine corruption in error path
CVE-2026-64207 net/sched: dualpi2: fix GSO backlog accounting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64189

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