Out-of-bounds read in Linux kernel - CVE-2026-89785
Published: September 17, 2026
Vulnerability identifier: #VU150496
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89785
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to read beyond the allocated buffer.
The vulnerability exists due to an out-of-bounds read in ntfs_reparse_init() and ntfs_objid_init() when mounting a crafted NTFS filesystem image containing a malformed resident INDEX_ROOT attribute. A local privileged user can mount a crafted filesystem image to read beyond the allocated buffer.
Exploitation requires CAP_SYS_ADMIN.
Affected software
Linux kernel
How to mitigate CVE-2026-89785
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/2064bc663f89e61b8681c1fb9d1ce445de72063d
- https://git.kernel.org/stable/c/64bb6000bfbdf241a6dd578199acd90321a4243e
- https://git.kernel.org/stable/c/66c074eab6f966fbe48a0fc4b3a45b2a2e2df527
- https://git.kernel.org/stable/c/72caafbc95c5dca8266a942b8e96ad81d8d9adc7
- https://git.kernel.org/stable/c/94fce1d3e74fe011e21f17490ba58491709fd7e5
- https://git.kernel.org/stable/c/bd631e2005290a55c8edda87363bc0d594c01705
- https://git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88