CVE-2026-31480

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LOCK]\n\nFix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock)."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_osnoise.c"], "versions": [{"version": "bce29ac9ce0bb0b0b146b687ab978378c21e9078", "lessThan": "cf929c21eeed5bd39873fb14bfdfff963fa6f1da", "status": "affected", "versionType": "git"}, {"version": "bce29ac9ce0bb0b0b146b687ab978378c21e9078", "lessThan": "7aa095ce7d224308cb6979956f0de8607df93d4f", "status": "affected", "versionType": "git"}, {"version": "bce29ac9ce0bb0b0b146b687ab978378c21e9078", "lessThan": "ef41a85a55022e27cdaebf22a6676910b66f65aa", "status": "affected", "versionType": "git"}, {"version": "bce29ac9ce0bb0b0b146b687ab978378c21e9078", "lessThan": "03474a01c199de17a8e2d39b51df6beb9c76e831", "status": "affected", "versionType": "git"}, {"version": "bce29ac9ce0bb0b0b146b687ab978378c21e9078", 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true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix potential deadlock in cpu hotplug with osnoise\n\nThe following sequence may leads deadlock in cpu hotplug:\n\n task1 task2 task3\n ----- ----- -----\n\n mutex_lock(&interface_lock)\n\n [CPU GOING OFFLINE]\n\n cpus_write_lock();\n osnoise_cpu_die();\n kthread_stop(task3);\n wait_for_completion();\n\n osnoise_sleep();\n mutex_lock(&interface_lock);\n\n cpus_read_lock();\n\n [DEAD LOCK]\n\nFix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock)."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntracing: Soluciona un interbloqueo potencial en el hotplug de CPU con osnoise\n\nLa siguiente secuencia puede llevar a un interbloqueo en el hotplug de CPU:\n\n tarea1 tarea2 tarea3\n - - - - - - - - - - - - - - -\n\n mutex_lock(ref:interface_lock)\n\n [CPU PASANDO A ESTADO DESCONECTADO]\n\n cpus_write_lock();\n osnoise_cpu_die();\n kthread_stop(task3);\n wait_for_completion();\n\n osnoise_sleep();\n mutex_lock(ref:interface_lock);\n\n cpus_read_lock();\n\n [INTERBLOQUEO]\n\nSolucionado intercambiando el orden de cpus_read_lock() y mutex_lock(ref:interface_lock)."}], "id": "CVE-2026-31480", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31480", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:34:34.600654Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:45.170", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03474a01c199de17a8e2d39b51df6beb9c76e831"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f9885732248d22f788e4992c739a98c88ab8a55"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7aa095ce7d224308cb6979956f0de8607df93d4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf929c21eeed5bd39873fb14bfdfff963fa6f1da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ef41a85a55022e27cdaebf22a6676910b66f65aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tracing: Fix potential deadlock in cpu hotplug with osnoise", "id": "2460642", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460642"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-833", "details": ["A flaw was found in the Linux kernel. A local attacker or a user with specific privileges could exploit a race condition during CPU hotplug operations, specifically when using the 'osnoise' tracing feature. This vulnerability can lead to a system deadlock, rendering the system unresponsive and requiring a reboot."], "name": "CVE-2026-31480", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31480\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31480\nhttps://lore.kernel.org/linux-cve-announce/2026042258-CVE-2026-31480-c2bf@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,cf929c21eeed5bd39873fb14bfdfff963fa6f1da)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,7aa095ce7d224308cb6979956f0de8607df93d4f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,ef41a85a55022e27cdaebf22a6676910b66f65aa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,03474a01c199de17a8e2d39b51df6beb9c76e831)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bce29ac9ce0bb0b0b146b687ab978378c21e9078,1f9885732248d22f788e4992c739a98c88ab8a55)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-28T15:37:56.215580+00:00", "value": {"mitigation_remediation": ["Apply the kernel patch that reorders cpus_read_lock and mutex_lock during CPU hotplug operations", "Upgrade to the latest stable Linux kernel that contains the fix", "If an upgrade cannot be performed immediately, monitor for CPU hotplug events and restrict or disable hotplug until the patch is applied"], "summary": {"action": "Patch", "impact": "Denial of Service via kernel deadlock"}, "threat_synthesis": {"affected_systems": "The flaw is present in Linux kernels that include the tracing and osnoise components before the commit that reordered the lock acquisition. No specific version range is listed, so any system built from mainline sources prior to the patch may be vulnerable, regardless of distribution or vendor.", "description_and_impact": "The Linux kernel tracing subsystem can deadlock during a CPU hotplug operation when a CPU is taken offline. The issue arises because the interface_lock mutex is acquired before the cpus_read_lock, which leads a thread to wait indefinitely after a cpu_die event. This lock ordering bug causes a kernel freeze and results in a denial\u2011of\u2011service condition that can halt all services running on the host.", "risk_and_exploitability": "The EPSS score is < 1%, indicating a low exploitation probability. The CVSS score of 5.5 denotes a medium severity. Based on the description, it is inferred that the attacker must be able to trigger a CPU hotplug event, which typically requires authenticated local or remote control of the node. Because the deadlock occurs inside the kernel, the impact is strictly availability; a kernel panic or prolonged stall will stop all processes. The likelihood of exploitation depends on the environment and the frequency of hotplug events, but the absence of a publicly available exploit reduces the immediate risk. Administrators should evaluate whether their systems undergo CPU hotplug and consider the vulnerability\u2019s severity when planning remediation."}}}}, "created": "2026-04-22T17:00:11.718595+00:00", "updated": "2026-04-28T15:45:06.376246+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-667", "CWE-833"]}