CVE-2026-23138

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Each bit represents the context that the event is\nin (normal, softirq, interrupt and NMI).\n\nHave the stack trace code use the interrupt context to protect against\nrecursion.\n\nNote, the bug showed an issue in both the RCU code as well as the tracing\nstacktrace code. This only handles the tracing stack trace side of the\nbug. 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The stack trace code\ncalled back into RCU which then called the stack trace again.\n\nExpand the ftrace recursion protection to add a set of bits to protect\nevents from recursion. Each bit represents the context that the event is\nin (normal, softirq, interrupt and NMI).\n\nHave the stack trace code use the interrupt context to protect against\nrecursion.\n\nNote, the bug showed an issue in both the RCU code as well as the tracing\nstacktrace code. This only handles the tracing stack trace side of the\nbug. The RCU fix will be handled separately."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrastreo: A\u00f1adir protecci\u00f3n contra recursi\u00f3n en la grabaci\u00f3n de trazas de pila del kernel\n\nSe inform\u00f3 de un error sobre una recursi\u00f3n infinita causada por el rastreo de los eventos rcu con el disparador de traza de pila del kernel habilitado. El c\u00f3digo de traza de pila volvi\u00f3 a llamar a RCU, que luego volvi\u00f3 a llamar a la traza de pila.\n\nExpandir la protecci\u00f3n contra recursi\u00f3n de ftrace para a\u00f1adir un conjunto de bits para proteger los eventos de la recursi\u00f3n. Cada bit representa el contexto en el que se encuentra el evento (normal, softirq, interrupci\u00f3n y NMI).\n\nHacer que el c\u00f3digo de traza de pila use el contexto de interrupci\u00f3n para proteger contra la recursi\u00f3n.\n\nNota, el error mostr\u00f3 un problema tanto en el c\u00f3digo RCU como en el c\u00f3digo de traza de pila de rastreo. Esto solo aborda el lado de la traza de pila de rastreo del error. La correcci\u00f3n de RCU se manejar\u00e1 por separado."}], "id": "CVE-2026-23138", "lastModified": "2026-11-05T22:18:03.787", "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-2026-23138", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:20:26.314570Z", "version": "2.0.3"}}]}, "published": "2026-02-14T16:15:53.830", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/19e18e6dabb1bbba76d2809ca7d8ae9e1f5975fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b7f91acffd2c4c000971553d22efa1e1bb4feae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/80fe242a6239778025ba3be8e7263e3d69c37947"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b03768037d91ce727effb1c5d92d2c7781bf692"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tracing: Add recursion protection in kernel stack trace recording", "id": "2439868", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439868"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Add recursion protection in kernel stack trace recording\nA bug was reported about an infinite recursion caused by tracing the rcu\nevents with the kernel stack trace trigger enabled. The stack trace code\ncalled back into RCU which then called the stack trace again.\nExpand the ftrace recursion protection to add a set of bits to protect\nevents from recursion. Each bit represents the context that the event is\nin (normal, softirq, interrupt and NMI).\nHave the stack trace code use the interrupt context to protect against\nrecursion.\nNote, the bug showed an issue in both the RCU code as well as the tracing\nstacktrace code. This only handles the tracing stack trace side of the\nbug. The RCU fix will be handled separately."], "name": "CVE-2026-23138", "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": "2026-02-14T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23138\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23138\nhttps://lore.kernel.org/linux-cve-announce/2026021429-CVE-2026-23138-9853@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce,5b7f91acffd2c4c000971553d22efa1e1bb4feae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5f5fa7ea89dc82d34ed458f4d7a8634e8e9eefce,5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb)"}}], "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.6,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19,*]"}}], "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-16T06:49:52.731462+00:00", "value": {"mitigation_remediation": ["Upgrade to a kernel that includes the recursion protection commit, such as Linux kernel 6.19.0 or later, or apply the specific patch (commit 19e18e6) from the kernel source.", "If an immediate kernel upgrade is not feasible, disable the RCU tracing feature or the stack trace trigger by adjusting kernel configuration or using system controls to prevent the recursion path from activating.", "Continuously monitor system logs for trace-related recursion errors after the update to confirm that the issue has been resolved."], "summary": {"action": "Patch Now", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "This issue affected all Linux kernel releases prior to the inclusion of the recursion protection fix, including the early release candidates of kernel 6.19 (rc1 through rc4) and earlier stable releases. It applies to any system running the standard Linux kernel where RCU tracing is enabled and the stack trace trigger is active.", "description_and_impact": "A bug in the Linux kernel tracing subsystem could cause an infinite recursion when RCU events are traced with the stack trace trigger enabled. The recursion occurs because the stack trace code calls back into RCU, which then triggers the stack trace again, exhausting the kernel stack and resulting in a kernel panic or system crash. The recent fix introduces recursion protection bits so that retracing is prevented, mitigating the denial of service potential. Without the patch, an attacker with the ability to enable kernel tracing may be able to voluntarily trigger this crash and render the system unavailable.", "risk_and_exploitability": "The CVSS score of 5.5 indicates a medium severity vulnerability. The EPSS score of less than 1% suggests a low likelihood of exploitation in the wild, and the vulnerability is not listed in CISA's KEV catalog. The attack vector most likely requires a privileged or root user to enable the specific tracing configuration that triggers the recursion. An unprivileged user cannot exploit the flaw unless kernel configuration permits arbitrary kernel tracing."}}}}, "created": "2026-02-16T12:01:28.293140+00:00", "updated": "2026-04-16T07:00:10.977725+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-703"]}