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Advisory severityHigh7.0Red Hat Linux

High [CVE-2026-64002] free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table

This high-severity Red Hat Linux advisory covers CVE-2026-64002 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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

CVE-2026-64002 Source published Source updated

VulniPulse record published Record updated

CVE-2026-64002
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: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports too soon.

Only after unregister_net_sysctl_table() we can be sure no threads can possibly use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports. A flaw was found in the Linux kernel's IPv4 networking component.

The `ipv4_sysctl_exit_net()` function prematurely frees the `net->ipv4.sysctl_local_reserved_ports` memory. This can lead to a use-after-free vulnerability, where other threads might attempt to access deallocated memory.

Such an issue can result in system instability or a denial of service. Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-825.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 7 more.

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 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.52.1.el10_2
  • kpatch-patch
  • kernel-0:6.12.0-55.102.1.el10_0
  • kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10
  • kernel-0:4.18.0-553.164.1.el8_10
  • kernel-0:4.18.0-305.203.1.el8_4
  • kernel-0:4.18.0-372.210.1.el8_6
  • kernel-0:4.18.0-477.163.1.el8_8
  • kernel-0:5.14.0-687.44.1.el9_8
  • kernel-0:5.14.0-284.190.1.el9_2
  • kernel-rt-0:5.14.0-284.190.1.rt14.475.el9_2
  • kernel-0:5.14.0-427.148.1.el9_4
  • kernel-0:5.14.0-570.138.1.el9_6
  • RHSA-2026:64775
  • RHSA-2026:82326
  • RHSA-2026:62609
  • RHSA-2026:68532
  • RHSA-2026:68531
  • RHSA-2026:81523
  • RHSA-2026:61959
  • RHSA-2026:61310
  • RHSA-2026:61932
  • RHSA-2026:81450
  • RHSA-2026:63129
  • RHSA-2026:81452
  • RHSA-2026:62508
  • RHSA-2026:62522
  • RHSA-2026:81453
  • RHSA-2026:62346
  • RHSA-2026:81449
  • RHSA-2026:62568
  • RHSA-2026:81451

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.52.1.el10_2, kpatch-patch, kernel-0:6.12.0-55.102.1.el10_0, kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10, kernel-0:4.18.0-553.164.1.el8_10, kernel-0:4.18.0-305.203.1.el8_4. 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 7 days ago·verify at source

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