{"id":"CVE-2026-89769","title":"clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path\n\nWhen cpuhp_setup_state fails after pit_clockevent_per_cpu_init has\nsuccessfully called reques…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= bee33f22d7c30626e711b4900e3f460b6e0e104f < d53c29a89a15e56a1797f3ef249955e544782e04","Linux >= bee33f22d7c30626e711b4900e3f460b6e0e104f < cdcd861123248e871c2ec2be968b0a1b2a5a34b0","Linux >= bee33f22d7c30626e711b4900e3f460b6e0e104f < 05520e035f8332c8e33f3011b5ca016fde61793d","Linux 6.18"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:52:22.773Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89769","references":[{"url":"https://git.kernel.org/stable/c/d53c29a89a15e56a1797f3ef249955e544782e04"},{"url":"https://git.kernel.org/stable/c/cdcd861123248e871c2ec2be968b0a1b2a5a34b0"},{"url":"https://git.kernel.org/stable/c/05520e035f8332c8e33f3011b5ca016fde61793d"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89769.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89769"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532161"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89769"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89769"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89769.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00166,"epssPercentile":0.0584,"scores":{"cna":7.4,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.472Z","slug":"CVE-2026-89769","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nclocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path\n\nWhen cpuhp_setup_state fails after pit_clockevent_per_cpu_init has\nsuccessfully called request_irq, the error handling jumps directly to\nout_pit_clocksource_unregister without freeing the registered IRQ.\n\nThis leaks the IRQ line and, since kfree(pit) follows, leaves a\ndangling pointer registered as the interrupt handler's dev_id,\npotentially leading to a use-after-free if the IRQ fires afterwards.\n\nFix it by calling pit_clockevent_per_cpu_exit to properly release the\nIRQ before falling through to the existing cleanup chain.\n\n## Affected\n\n- `Linux >= bee33f22d7c30626e711b4900e3f460b6e0e104f < d53c29a89a15e56a1797f3ef249955e544782e04`\n- `Linux >= bee33f22d7c30626e711b4900e3f460b6e0e104f < cdcd861123248e871c2ec2be968b0a1b2a5a34b0`\n- `Linux >= bee33f22d7c30626e711b4900e3f460b6e0e104f < 05520e035f8332c8e33f3011b5ca016fde61793d`\n- `Linux 6.18`\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 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89769.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224564,"id":"CVE-2026-89769","ts":1792401409596,"field":"cvss","old":"5.5","new":"7.4"},{"seq":224563,"id":"CVE-2026-89769","ts":1792401409596,"field":"severity","old":"medium","new":"high"},{"seq":208928,"id":"CVE-2026-89769","ts":1790062291576,"field":"cvss","old":"7.5","new":"5.5"},{"seq":208927,"id":"CVE-2026-89769","ts":1790062291576,"field":"severity","old":"high","new":"medium"},{"seq":202948,"id":"CVE-2026-89769","ts":1789403733073,"field":"cvss","old":"7.4","new":"7.5"},{"seq":197656,"id":"CVE-2026-89769","ts":1789384318275,"field":"cvss","old":"7.5","new":"7.4"},{"seq":183703,"id":"CVE-2026-89769","ts":1789356677026,"field":"cvss","old":"7.4","new":"7.5"},{"seq":153658,"id":"CVE-2026-89769","ts":1789285351826,"field":"cvss","old":null,"new":"7.4"},{"seq":153657,"id":"CVE-2026-89769","ts":1789285351826,"field":"severity","old":"none","new":"high"},{"seq":147634,"id":"CVE-2026-89769","ts":1789270211677,"field":"cvss","old":null,"new":"7.5"},{"seq":147633,"id":"CVE-2026-89769","ts":1789270211677,"field":"severity","old":"none","new":"high"},{"seq":109390,"id":"CVE-2026-89769","ts":1789183731720,"field":"cvss","old":null,"new":"7.5"},{"seq":109389,"id":"CVE-2026-89769","ts":1789183731720,"field":"severity","old":"none","new":"high"}]}