CVE-2026-53023 fs/ntfs3: terminate the cached volume label after UTF-8 conversion
An attacker can read past the end of a buffer in the Linux kernel NTFS3 driver, potentially exposing sensitive memory contents.
- 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-2026-53023?
CVE-2026-53023 is a medium-severity vulnerability in Linux kernel, published on 24 Jun 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: terminate the cached volume label after UTF-8 conversion
ntfs_fill_super() loads the on-disk volume label with utf16s_to_utf8s() and stores the result in sbi->volume.label. The converted label is later exposed through ntfs3_label_show() using %s, but utf16s_to_utf8s() only returns the number of bytes written and does not add a trailing NUL.
If the converted label fills the entire fixed buffer, ntfs3_label_show() can read past the end of sbi->volume.label while looking for a terminator.
Terminate the cached label explicitly after a successful conversion and clamp the exact-full case to the last byte of the buffer.
Which versions are affected by CVE-2026-53023?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53023?
Apply the vendor's patch.
Is CVE-2026-53023 being exploited?
There is no known exploitation of CVE-2026-53023 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53023, DEBIAN-CVE-2026-53023, GHSA-fw3c-7wwh-rhhf, ROOT-OS-DEBIAN-12-CVE-2026-53023, ROOT-OS-UBUNTU-2204-CVE-2026-53023, ROOT-OS-UBUNTU-2404-CVE-2026-53023 and 1 more.