CVE-2026-46062 ntfs3: fix integer overflow in run_unpack() volume boundary check
An integer overflow in the Linux kernel ntfs3 driver allows bypassing volume boundary checks, potentially leading to memory corruption or undefined behavior.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-46062?
CVE-2026-46062 is a high-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ntfs3: fix integer overflow in run_unpack() volume boundary check
The volume boundary check `lcn + len > sbi->used.bitmap.nbits` uses raw addition which can wrap around for large lcn and len values, bypassing the validation. Use check_add_overflow() as is already done for the adjacent prev_lcn + dlcn and vcn64 + len checks added by commit 3ac37e100385 ("ntfs3: Fix integer overflow in run_unpack()").
Found by fuzzing with a source-patched harness (LibAFL + QEMU).
Weakness: CWE-190
Which versions are affected by CVE-2026-46062?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46062?
Apply the vendor's patch.
Is CVE-2026-46062 being exploited?
There is no known exploitation of CVE-2026-46062 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88650, BELL-CVE-2026-46062, DEBIAN-CVE-2026-46062, GHSA-68g3-h729-p4rw, ROOT-OS-DEBIAN-12-CVE-2026-46062, ROOT-OS-UBUNTU-2204-CVE-2026-46062 and 2 more.