Out-of-bounds write in Linux kernel - CVE-2026-89965
Published: September 16, 2026
Vulnerability identifier: #VU150315
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89965
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to an out-of-bounds write in the nvdimm/btt arena I/O path when processing a crafted or foreign arena whose nfree value is below the lane count. A local user can provide a crafted or foreign arena to write past per-lane freelist and rtt array allocations and execute arbitrary code.
Affected software
Linux kernel
How to mitigate CVE-2026-89965
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/59d5cd1f42b4bab3609512c3cb3d3540d3d21da7
- https://git.kernel.org/stable/c/6a1f2e5ed9267ca19187038ac635393c165213ac
- https://git.kernel.org/stable/c/6b1faf1f099f7060b5f1f2f0d024132581f1726e
- https://git.kernel.org/stable/c/6f79d1a5f2611a3d36e9312be5425cd9cb397c51
- https://git.kernel.org/stable/c/9dfa11cef4750b67591307f2c62e47a23d60e4b7
- https://git.kernel.org/stable/c/eb491343d2d1784121ad9af91c25b338c28913c3
- https://git.kernel.org/stable/c/f6c5313aae794ecca8f762c1a3493de5c266f120
- https://git.kernel.org/stable/c/f9bf05c63b77d000e9c01f3e47af36973887d350