CVE-2026-53023

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.

References

• https://git.kernel.org/stable/c/0b11fcbe80a59acdf58337d80ebb5f72201d73d6
• https://git.kernel.org/stable/c/32b0686369e0afbb3549a0d93e2d8517da84cd30
• https://git.kernel.org/stable/c/54d564b762389679e2f8fb9eeb20af7e82371e1c
• https://git.kernel.org/stable/c/5cd0707b81cb4589f00aec5c4c1288bd0980d2a4
• https://git.kernel.org/stable/c/6136bbb054f7ab9f51ae99915541633b18bcef90