Out-of-bounds read in Linux kernel - CVE-2026-64533
Published: July 28, 2026
Vulnerability identifier: #VU139861
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64533
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in log_replay() in fs/ntfs3 when replaying a malformed NTFS filesystem restart table. A local user can provide a specially crafted filesystem image to cause a denial of service.
The issue occurs during conversion of DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY records for version 0 restart tables.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64533
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1
External References
- https://git.kernel.org/stable/c/159f694d682e4215b3822ae31ed3a4631628fe55
- https://git.kernel.org/stable/c/32b9f8733feb241627fa5f564b1a99b5cae974c5
- https://git.kernel.org/stable/c/57c071e2c4f30b9c6f5aacb6679aab1269fbae99
- https://git.kernel.org/stable/c/6a4c53a2e26a865565bd6a460961e8d6fcb32329
- https://git.kernel.org/stable/c/7adb38279812c9c06b0e3fa7382f4d7887f3fa2d
- https://git.kernel.org/stable/c/ca343a99806b4fc8e27c48f08be3445c5fcd1445
- https://git.kernel.org/stable/c/ddfc8683e1a627dbf1b83bacf8961443dd654258