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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-64189] fix race between dump and ip_set_list resize

This high-severity Red Hat Linux advisory covers CVE-2026-64189 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-64189 Source published Source updated

VulniPulse record published Record updated

CVE-2026-64189
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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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)...

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.50.1.el10_2
  • kernel-rt-0:4.18.0-553.158.1.rt7.499.el8_10
  • kernel-0:4.18.0-553.158.1.el8_10
  • kernel-0:5.14.0-687.42.1.el9_8
  • RHSA-2026:61887
  • RHSA-2026:59737
  • RHSA-2026:59821
  • RHSA-2026:59723

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.50.1.el10_2, kernel-rt-0:4.18.0-553.158.1.rt7.499.el8_10, kernel-0:4.18.0-553.158.1.el8_10, kernel-0:5.14.0-687.42.1.el9_8, RHSA-2026:61887, RHSA-2026:59737. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

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