{"id":"CVE-2026-98832","title":"kernel: blk-cgroup: save IRQ state in blkg_tryget_closest() (CVE-2026-98832)","summary":"A flaw was found in the Linux kernel's block control group (blk-cgroup) subsystem. When associating block I/O requests with control groups, the kernel prematurely re-enables interrupts while internal locks are still held. A local user can …","severity":"medium","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-833","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T21:27:47+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98832.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98832.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98832"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555235"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98832"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98832"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98832.mbox"},{"url":"https://git.kernel.org/stable/c/9fcf4317384ce6758c3127a6e8914c54cbb9c8cc"},{"url":"https://git.kernel.org/stable/c/327c428ba79b13e4cc5253333a9d5c0aa5579bdf"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00155,"epssPercentile":0.04642,"ingestedAt":"2026-10-18T16:47:32.470Z","slug":"CVE-2026-98832","body":"## Overview\n\nA flaw was found in the Linux kernel's block control group (blk-cgroup) subsystem. When associating block I/O requests with control groups, the kernel prematurely re-enables interrupts while internal locks are still held. A local user can trigger this flaw during storage operations, causing an interrupt handler to attempt to acquire the locked resource. This results in a system deadlock and a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98832.json)\n\n**kernel: blk-cgroup: save IRQ state in blkg_tryget_closest()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n\nNot affected:\n\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":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228630,"id":"CVE-2026-98832","ts":1792844819823,"field":"cvss","old":null,"new":"4.7"},{"seq":228629,"id":"CVE-2026-98832","ts":1792844819823,"field":"severity","old":"none","new":"medium"}]}