High7.1Vendor: MediumRed Hat Linux

High [CVE-2026-64162] fix read_dev_clk_lock spinlock init in idpf_ptp_init

This high-severity Red Hat Linux advisory covers CVE-2026-64162 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.

CVE-2026-64162 Published Jul 19, 2026Updated by vendor Jul 19, 2026

CVE-2026-64162

Affected products & platforms

Red Hat LinuxLinux Kernel

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Summary

In the Linux kernel, the following vulnerability has been resolved: idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init() In idpf_ptp_init(), read_dev_clk_lock is initialized after ptp_schedule_worker() had already been called (and after idpf_ptp_settime64() could reach the lock).

Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat package: kernel-rt.

Affected versions

< 12973.796587
< 00.0
< 12974.094507
< 12974.097208
< 12974.097213
< 12974.097218
< 12974.097234
< 12974.097249
< 12974.097259
< 12974.097272
< 12974.097281
< 12974.097311
< 12974.097318
< 12974.097330
< 12974.097343
< 12974.097353
< 12974.097373
< 12974.097391
< 12974.097404
< 12974.097411
< 12974.097428
< 12974.097436
< 12974.097454
< 12974.097464

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

If the Intel Ethernet PTP functionality is not required, the `idpf` kernel module can be blacklisted to prevent it from loading. This can be achieved by creating a modprobe configuration file. 1. Create a file named `/etc/modprobe.d/blacklist-idpf.conf` with the following content: ``` blacklist idpf install idpf /bin/true ``` 2. Regenerate the initramfs to ensure the blacklist is applied during boot: - For systems using Dracut: `dracut -f -v` - For systems using mkinitcpio: `mkinitcpio -P` 3. Reboot the system for the changes to take effect. This mitigation may impact systems that rely on Intel Ethernet PTP for time synchronization.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

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