CVE-2026-23356

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And a potential crash\nat this point may not realizs that these extents could have been target\nof in-flight IO and would need to be resynced just in case.\n\nAlso, once the request completes, it will give up activity log references it\ndoes not even hold, which will trigger a BUG_ON(refcnt == 0) in lc_put().\n\nFix:\n\nDo not crash the kernel for a condition that is harmless during normal\noperation: also catch \"e->refcnt == 0\", not only \"e == NULL\"\nwhen being noisy about \"al_complete_io() called on inactive extent %u\\n\".\n\nAnd do not try to be smart and \"guess\" whether something will work, then\nbe surprised when it does not.\nDeal with the fact that it may or may not work. If it does not, remember a\npossible \"partially in activity log\" state (only possible for requests that\ncross extent boundaries), and return an error code from\ndrbd_al_begin_io_nonblock().\n\nA latter call for the same request will then resume from where we left off."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/drbd/drbd_actlog.c", "drivers/block/drbd/drbd_interval.h"], "versions": [{"version": "08a1ddab6df7d3c7b6341774cb1cf4b21b96a214", "lessThan": "933d161baa3794547adee621c0bf52cbf2c1b3cd", "status": "affected", "versionType": "git"}, {"version": "08a1ddab6df7d3c7b6341774cb1cf4b21b96a214", "lessThan": "cf01aa6288e1190f89865e765056e2a9d8190639", "status": "affected", "versionType": "git"}, {"version": "08a1ddab6df7d3c7b6341774cb1cf4b21b96a214", "lessThan": "7752569fc78e89794ce28946529850282233f99d", "status": "affected", 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"https://git.kernel.org/stable/c/ab140365fb62c0bdab22b2f516aff563b2559e3b"}], "title": "drbd: fix \"LOGIC BUG\" in drbd_al_begin_io_nonblock()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:14:18.241Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}]}}

{}

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And a potential crash\nat this point may not realizs that these extents could have been target\nof in-flight IO and would need to be resynced just in case.\n\nAlso, once the request completes, it will give up activity log references it\ndoes not even hold, which will trigger a BUG_ON(refcnt == 0) in lc_put().\n\nFix:\n\nDo not crash the kernel for a condition that is harmless during normal\noperation: also catch \"e->refcnt == 0\", not only \"e == NULL\"\nwhen being noisy about \"al_complete_io() called on inactive extent %u\\n\".\n\nAnd do not try to be smart and \"guess\" whether something will work, then\nbe surprised when it does not.\nDeal with the fact that it may or may not work. If it does not, remember a\npossible \"partially in activity log\" state (only possible for requests that\ncross extent boundaries), and return an error code from\ndrbd_al_begin_io_nonblock().\n\nA latter call for the same request will then resume from where we left off."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrbd: corrige el 'LOGIC BUG' en drbd_al_begin_io_nonblock()\n\nAunque verificamos que \"deber\u00edamos\" poder hacer lc_get_cumulative() mientras mantenemos el spinlock device->al_lock, a\u00fan puede fallar, si alguna otra ruta de c\u00f3digo decidi\u00f3 hacer lc_try_lock() con una sincronizaci\u00f3n deficiente.\n\nSi eso suced\u00eda, registr\u00e1bamos 'LOGIC BUG for enr=...', pero a\u00fan as\u00ed no devolv\u00edamos un error.\n\nEl resto del c\u00f3digo ahora asum\u00eda que esta solicitud tiene referencias para las extensiones de registro de actividad relevantes.\n\nLas implicaciones son que durante una resincronizaci\u00f3n activa, la exclusividad mutua de la resincronizaci\u00f3n frente a la E/S de la aplicaci\u00f3n no est\u00e1 garantizada. Y un posible fallo en este punto podr\u00eda no darse cuenta de que estas extensiones podr\u00edan haber sido objetivo de E/S en curso y necesitar\u00edan ser resincronizadas por si acaso.\n\nAdem\u00e1s, una vez que la solicitud se completa, liberar\u00e1 referencias del registro de actividad que ni siquiera posee, lo que activar\u00e1 un BUG_ON(refcnt == 0) en lc_put().\n\nSoluci\u00f3n:\n\nNo bloquear el kernel por una condici\u00f3n inofensiva durante el funcionamiento normal: tambi\u00e9n capturar 'e->refcnt == 0', no solo 'e == NULL' al ser ruidoso sobre 'al_complete_io() called on inactive extent %u\\n'.\n\nY no intentar ser inteligente y \"adivinar\" si algo funcionar\u00e1, para luego sorprenderse cuando no lo haga.\nAfrontar el hecho de que puede o no funcionar. Si no funciona, recordar un posible estado de 'parcialmente en el registro de actividad' (solo posible para solicitudes que cruzan l\u00edmites de extensi\u00f3n), y devolver un c\u00f3digo de error desde drbd_al_begin_io_nonblock().\n\nUna llamada posterior para la misma solicitud se reanudar\u00e1 desde donde lo dejamos."}], "id": "CVE-2026-23356", "lastModified": "2026-10-15T02:18:51.510", "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"}]}, "published": "2026-03-25T11:16:34.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7752569fc78e89794ce28946529850282233f99d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/933d161baa3794547adee621c0bf52cbf2c1b3cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ab140365fb62c0bdab22b2f516aff563b2559e3b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf01aa6288e1190f89865e765056e2a9d8190639"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1ef3aed4df2ef1fe46befd8f2da9a6ec5445508"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e91d8d6565b7819d13dab21d4dbed5b45efba59b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eef1390125b660b8b61f9f227a03bb9c5e6d36a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f558e5404a72054b525dced1a0c66aa95a144153"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drbd: fix \"LOGIC BUG\" in drbd_al_begin_io_nonblock()", "id": "2451196", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451196"}, "csaw": false, "cwe": "CWE-413", "details": ["A flaw was found in the Linux kernel's Distributed Replicated Block Device (DRBD) component. A logic error in the `drbd_al_begin_io_nonblock()` function can lead to a race condition during active resynchronization. This can result in a system crash, causing a Denial of Service (DoS), due to the incorrect handling of activity log references."], "name": "CVE-2026-23356", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23356\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23356\nhttps://lore.kernel.org/linux-cve-announce/2026032537-CVE-2026-23356-0014@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7752569fc78e89794ce28946529850282233f99d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e91d8d6565b7819d13dab21d4dbed5b45efba59b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,eef1390125b660b8b61f9f227a03bb9c5e6d36a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,d1ef3aed4df2ef1fe46befd8f2da9a6ec5445508)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f558e5404a72054b525dced1a0c66aa95a144153)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,ab140365fb62c0bdab22b2f516aff563b2559e3b)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.77,6.13.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.17,6.19.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.7,6.20.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc2,*]"}}], "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": "2026-04-28T17:05:40.355740+00:00", "value": {"mitigation_remediation": ["Update the kernel to a version that contains the DRBD logic bug fix, apply the vendor patch or install the newer kernel package, then reboot the system to load the patched kernel.", "If using a custom kernel or compiling the DRBD module, rebuild the module against the updated kernel headers and reload it into the running kernel.", "Restart DRBD services on all nodes in the cluster to ensure the updated module is active, and monitor system logs for any residual \u201cLOGIC BUG\u201d messages, taking additional recovery steps if necessary."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service (Kernel Crash)"}, "threat_synthesis": {"affected_systems": "The flaw is present in all Linux kernel distributions that include the DRBD module, as indicated by the CPE entry for linux:linux_kernel. No specific kernel or DRBD version numbers are provided, meaning that any system deploying DRBD is potentially impacted. The problem is tied to the interaction of active resynchronization and application I/O on the kernel level.", "description_and_impact": "A logic bug in the Linux kernel\u2019s DRBD module can allow the kernel to crash during an active resynchronization of disk replicas. The issue originates when the code incorrectly handles a situation where a lock acquisition fails while holding the al_lock spinlock, causing a LOGIC BUG log message but the request is not aborted. This progresses to an attempt to release activity log references that were never granted, which triggers a BUG_ON and results in a kernel panic. The crash can also lead to incomplete resynchronization and data inconsistency if the affected extents were mid\u2011flight IO. The vulnerability therefore poses a confidentiality, integrity, and availability risk for systems using DRBD.", "risk_and_exploitability": "The CVSS score of 5.5 indicates moderate severity, reflecting a logic bug that mishandles lock acquisition and activity log reference cleanup. This flaw maps to CWE-413 and CWE-617. The EPSS score is still less than 1%, indicating a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Based on the description, the most probable attack vector is a local or privileged user triggering the failure during DRBD resynchronization. Compromise is unlikely without such privileged context, yet the impact of a kernel crash is critical. Attackers would need to induce specific timing conditions that cause the lock failure, a nontrivial task, which further lowers the overall exploitation risk."}}}}, "created": "2026-03-25T21:31:59.378355+00:00", "updated": "2026-04-28T17:15:21.239940+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}