{"id":"CVE-2026-90135","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()\n\nsashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/*\ncauses use-afer-free crash when …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()\n\nsashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/*\ncauses use-afer-free crash when …","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c","Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 5fe03b5257095e2beef0bc79e1f068fbd09a24c7","Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 63ab05e8f9654aa100d366c0236399fda6ffaab1","Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 0b1c2af8a22c35cb099c735c2f63ea3ba757557d","Linux 5.17"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:06.053","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90135","references":[{"url":"https://git.kernel.org/stable/c/0b1c2af8a22c35cb099c735c2f63ea3ba757557d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5fe03b5257095e2beef0bc79e1f068fbd09a24c7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/63ab05e8f9654aa100d366c0236399fda6ffaab1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/45be87c5195f34c0a51598bc91186f600be5c4c9"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90135.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90135"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536278"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90135"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90135"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90135.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-90135"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.879Z","epss":0.00201,"epssPercentile":0.09869,"cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-416"],"slug":"CVE-2026-90135","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()\n\nsashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/*\ncauses use-afer-free crash when either alloc_percpu() or dev_addr_init()\nin alloc_netdev_mqs() failed, for commit 4d92b95ff2f9 (\"net: add net device\nrefcount tracker infrastructure\") added ref_tracker_dir_exit() to only\nfree_netdev() path.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90135.json)","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228204,"id":"CVE-2026-90135","ts":1792758184341,"field":"cvss","old":null,"new":"4.7"},{"seq":228203,"id":"CVE-2026-90135","ts":1792758184341,"field":"severity","old":"none","new":"medium"}]}