CVE-2026-45864 fs/ntfs3: prevent infinite loops caused by the next valid being the same
A flaw in the Linux kernel's NTFS3 driver allows attackers to cause a denial of service via an infinite loop triggered by invalid data processing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45864?
CVE-2026-45864 is a medium-severity denial of service vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: prevent infinite loops caused by the next valid being the same
When processing valid within the range [valid : pos), if valid cannot be retrieved correctly, for example, if the retrieved valid value is always the same, this can trigger a potential infinite loop, similar to the hung problem reported by syzbot [1].
Adding a check for the valid value within the loop body, and terminating the loop and returning -EINVAL if the value is the same as the current value, can prevent this.
[1] INFO: task syz.4.21:6056 blocked for more than 143 seconds. Call Trace: rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244 inode_lock include/linux/fs.h:1027 [inline] ntfs_file_write_iter+0xe6/0x870 fs/ntfs3/file.c:1284
Weakness: CWE-835
Which versions are affected by CVE-2026-45864?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45864?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-45864 being exploited?
There is no known exploitation of CVE-2026-45864 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-45864, DEBIAN-CVE-2026-45864, GHSA-g925-qgm3-hc5p, ROOT-OS-UBUNTU-2204-CVE-2026-45864, ROOT-OS-UBUNTU-2404-CVE-2026-45864, UBUNTU-CVE-2026-45864.