SB20261029203 - Buffer Access with Incorrect Length Value in Linux kernel ntfs

Description

This security bulletin contains information about 1 vulnerability.

1) Buffer Access with Incorrect Length Value (CVE-ID: CVE-2026-99107)

CWE-ID: CWE-805 - Buffer Access with Incorrect Length Value

CVSSv4: 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]

The vulnerability allows a local user to trigger incorrect memory operations that may cause kernel memory corruption and a denial of service.

The vulnerability exists due to incorrect memory-operation size calculations in the Linux kernel NTFS ntfs_new_attr_flags() function when resizing an attribute stored in an extent MFT record. A local user can trigger this attribute-resizing operation to cause the base MFT record pointer to be passed to ntfs_attr_record_resize() instead of the extent record pointer, resulting in incorrect memmove size calculations that may corrupt kernel memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a9122cada749447dfb6d67aa3fed4ee1982231c
• https://git.kernel.org/stable/c/8d139e3635c86e2c97c78d55538ce0b00b6d9986