CVE-2026-64066 netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
A flaw in the Linux kernel netfs module allows a denial of service via improper handling of failed subrequests during page cache reads.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64066?
CVE-2026-64066 is a critical vulnerability in Linux kernel, published on 19 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
Fix netfs_read_to_pagecache() so that it pauses the generation of new subrequests if an already-issued subrequest fails.
Weakness: CWE-125
Which versions are affected by CVE-2026-64066?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64066?
Apply the vendor's patch.
Is CVE-2026-64066 being exploited?
There is no known exploitation of CVE-2026-64066 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64066, DEBIAN-CVE-2026-64066, GHSA-m28h-7php-jrhg, ROOT-OS-DEBIAN-13-CVE-2026-64066, UBUNTU-CVE-2026-64066.