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TI-2026-45937 Aliases CVE-2026-64373GHSA-r493-vrrx-v3x2

cpufreq: Fix hotplug-suspend race during reboot

Priority LOW 20CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: cpufreq: Fix hotplug-suspend race during reboot During system reboot, cpufreq_suspend() is called via the kernel_restart() -> device_shutdown() path. Unlike the normal system suspend path, the reboot path does not call freeze_processes(), so userspace processes and kernel threads remain active. This allows CPU hotplug operations to run concurrently with cpufreq_suspend(). The original code has no synchronization with CPU hotplug, leading to a race condition where governor_data can be freed by the hotplug path while cpufreq_suspend() is still accessing it, resulting in a null pointer dereference: Unable to handle kernel NULL pointer dereference Call Trace: do_kernel_fault+0x28/0x3c cpufreq_suspend+0xdc/0x160 device_shutdown+0x18/0x200 kernel_restart+0x40/0x80 arm64_sys_reboot+0x1b0/0x200 Fix this by adding cpus_read_lock()/cpus_read_unlock() to cpufreq_suspend() to block CPU hotplug operations while suspend is in progress. [ rjw: Changelog edits ]

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00089 0th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.5, 4.10, 4.15 +10Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux4.4.198 to before 4.5; 4.9.198 to before 4.10; 4.14.151 to before 4.15; 4.19.81 to before 4.20; 5.3.8 to before 5.44.5, 4.10, 4.15, 4.20, 5.4Patch availableCNA
LinuxLinux5.4 and later5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2Patch availableCNA
  • Linux VendorLinux Affected 4.4.198 to before 4.5; 4.9.198 to before 4.10; 4.14.151 to before 4.15; 4.19.81 to before 4.20; 5.3.8 to before 5.4 Fixed in 4.5, 4.10, 4.15, 4.20, 5.4 Patch available CNA
  • Linux VendorLinux Affected 5.4 and later Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.4.198 to before 4.5; 4.9.198 to before 4.10; 4.14.151 to before 4.15; 4.19.81 to before 4.20; 5.3.8 to before 5.4; 5.4.1 to before 5.10.261; 5.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:*5.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.4:rc4:*:*:*:*:*:*5.4 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.4:rc5:*:*:*:*:*:*5.4 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.4:rc6:*:*:*:*:*:*5.4 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.4:rc7:*:*:*:*:*:*5.4 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.4:rc8:*:*:*:*:*:*5.4 rc8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.4.198 to before 4.5; 4.9.198 to before 4.10; 4.14.151 to before 4.15; 4.19.81 to before 4.20; 5.3.8 to before 5.4; 5.4.1 to before 5.10.261; 5.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:* Versions 5.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.4:rc4:*:*:*:*:*:* Versions 5.4 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.4:rc5:*:*:*:*:*:* Versions 5.4 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.4:rc6:*:*:*:*:*:* Versions 5.4 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.4:rc7:*:*:*:*:*:* Versions 5.4 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.4:rc8:*:*:*:*:*:* Versions 5.4 rc8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 4.5, 4.10, 4.15, 4.20, 5.4
  • Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Not affected: 1 product
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64373
  2. 2026-10-03 Alias added: GHSA-r493-vrrx-v3x2
  3. 2026-11-06 CISA SSVC decision points changed

References

Patch 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences