{"id":"CVE-2026-89440","title":"kernel: mmc: via-sdmmc: stop card-detect handling on probe failure (CVE-2026-89440)","summary":"A flaw was found in the Linux kernel's mmc: via-sdmmc component. During the probe process, if the `mmc_add_host()` function fails, the SD card-detect interrupt handler continues to operate on memory that has already been released. This can…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T21:44:11+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89440.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89440.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89440"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532121"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89440"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89440"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89440.mbox"},{"url":"https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8"},{"url":"https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1"},{"url":"https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49"},{"url":"https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02"},{"url":"https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99"},{"url":"https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b"},{"url":"https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4"},{"url":"https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00164,"epssPercentile":0.06027,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.454Z","slug":"CVE-2026-89440","body":"## Overview\n\nA flaw was found in the Linux kernel's mmc: via-sdmmc component. During the probe process, if the `mmc_add_host()` function fails, the SD card-detect interrupt handler continues to operate on memory that has already been released. This can lead to memory corruption, potentially allowing a local attacker to cause system instability or execute unauthorized code.\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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89440.json)\n\n**kernel: mmc: via-sdmmc: stop card-detect handling on probe failure** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\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 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204113,"id":"CVE-2026-89440","ts":1789490231634,"field":"cvss","old":"7.8","new":"7"},{"seq":183556,"id":"CVE-2026-89440","ts":1789356675871,"field":"cvss","old":"7.8","new":"5.8"},{"seq":183555,"id":"CVE-2026-89440","ts":1789356675871,"field":"severity","old":"high","new":"medium"},{"seq":153220,"id":"CVE-2026-89440","ts":1789285349604,"field":"cvss","old":null,"new":"7.8"},{"seq":153219,"id":"CVE-2026-89440","ts":1789285349604,"field":"severity","old":"none","new":"high"},{"seq":147736,"id":"CVE-2026-89440","ts":1789270212091,"field":"cvss","old":null,"new":"5.8"},{"seq":147735,"id":"CVE-2026-89440","ts":1789270212091,"field":"severity","old":"none","new":"medium"},{"seq":109484,"id":"CVE-2026-89440","ts":1789183732092,"field":"cvss","old":null,"new":"5.8"},{"seq":109483,"id":"CVE-2026-89440","ts":1789183732092,"field":"severity","old":"none","new":"medium"}]}