{"id":"CVE-2026-89722","title":"kernel: PCI/sysfs: Fix out-of-bounds read in pci_write_legacy_io() (CVE-2026-89722)","summary":"A flaw was found in the Linux kernel's PCI/sysfs component. A local user with root privileges could trigger an out-of-bounds read in the `pci_write_legacy_io()` function by writing to the `legacy_io` sysfs file with a size less than four b…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T19:43:55+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89722.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89722.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89722"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532142"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89722"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89722"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89722.mbox"},{"url":"https://git.kernel.org/stable/c/7a99e9c7011905734cc2739038f2a224b6be0d1f"},{"url":"https://git.kernel.org/stable/c/dc76258d0132df1d831a5a29758bd448ca9c566e"},{"url":"https://git.kernel.org/stable/c/e892f05f1f790d5721cd8e3c561ed76da7e08bae"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.09835,"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-89722","body":"## Overview\n\nA flaw was found in the Linux kernel's PCI/sysfs component. A local user with root privileges could trigger an out-of-bounds read in the `pci_write_legacy_io()` function by writing to the `legacy_io` sysfs file with a size less than four bytes. This improper handling of the write buffer can lead to memory corruption, potentially allowing for information disclosure or other system instability. On little-endian PowerPC systems, this could also result in an out-of-bounds write.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89722.json)\n\n**kernel: PCI/sysfs: Fix out-of-bounds read in pci_write_legacy_io()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205525,"id":"CVE-2026-89722","ts":1789576723391,"field":"cvss","old":"4.7","new":"5.5"},{"seq":204087,"id":"CVE-2026-89722","ts":1789490231381,"field":"cvss","old":null,"new":"4.7"},{"seq":204086,"id":"CVE-2026-89722","ts":1789490231381,"field":"severity","old":"none","new":"medium"},{"seq":147684,"id":"CVE-2026-89722","ts":1789270211873,"field":"cvss","old":null,"new":"4.7"},{"seq":147683,"id":"CVE-2026-89722","ts":1789270211873,"field":"severity","old":"none","new":"medium"},{"seq":109440,"id":"CVE-2026-89722","ts":1789183731923,"field":"cvss","old":null,"new":"4.7"},{"seq":109439,"id":"CVE-2026-89722","ts":1789183731923,"field":"severity","old":"none","new":"medium"}]}