--- title: "CVE-2026-89687: Linux Kernel - Broken Access Control" description: "Linux kernel contains a broken access control vulnerability caused by nfsd_file_do_acquire() using files not confirmed as opened, letting attackers potentially cause improper file handling, exploit requires NFS server interaction." url: https://panop.io/threat-heartbeat/CVE-2026-89687/ --- # CVE-2026-89687 Linux Kernel - Broken Access Control Linux kernel contains a broken access control vulnerability caused by nfsd\_file\_do\_acquire() using files not confirmed as opened, letting attackers potentially cause improper file handling, exploit requires NFS server interaction. CVSS base score 7.5 /10 High CISA KEV Not listed Public exploit None known Authentication Not required EPSS 0.49% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89687) ## Details Type Broken Access Control Impact Broken Access Control CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Published 11 September 2026 Updated 15 October 2026 ## Vendor fix Update to the latest Linux kernel version containing the fix. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-89687](https://nvd.nist.gov/vuln/detail/CVE-2026-89687) - [https://git.kernel.org/stable/c/5859cc01fee06a2cd7458905a9593082fbab06e1](https://git.kernel.org/stable/c/5859cc01fee06a2cd7458905a9593082fbab06e1) - [https://git.kernel.org/stable/c/a95a1cffacd0203100297001719160160f443dd6](https://git.kernel.org/stable/c/a95a1cffacd0203100297001719160160f443dd6) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)