netfilter: ipset: fix race between dump and ip_set_list resize

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64189
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-20 17:18:21 UTC
Updated2026-08-17 05:17:21 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001210000 probability, percentile 0.022760000 (date 2026-08-03)

Problem Types: CWE-362

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 a7a299277959683204d73333c32c092fd69327d4 git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 1bc67c3fc98e9fc07032cc56afcdbc690c47d11e git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 96fbafc20ebd9a613736c2998b89c539fe3042f5 git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 ff86ea9b7fdf70564e60436fbee68c96bc459943 git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 81d54c766337b923eec26da0a13406760b091093 git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 e8ee198bbc04a32d336e79160fde980e0235b39f git Not specified
CNA Linux Linux affected 8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 7cd9103283b26b917360ec99d7d2f2d761bcf1ab git Not specified
CNA Linux Linux affected 2f6bf7917f55f9dae913193e49672b3598620eab git Not specified
CNA Linux Linux affected 4.19.5 4.20 semver Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a7a299277959683204d73333c32c092fd69327d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1bc67c3fc98e9fc07032cc56afcdbc690c47d11e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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