CVE-2026-23110

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These race conditions can\ncause the SCSI layer to fail to wake the error handler, leaving I/O\nthrough the SCSI host stuck as the error state cannot advance.\n\nFirst, there is an memory ordering issue within scsi_dec_host_busy().\nThe write which clears SCMD_STATE_INFLIGHT may be reordered with reads\ncounting in scsi_host_busy(). While the local CPU will see its own\nwrite, reordering can allow other CPUs in scsi_dec_host_busy() or\nscsi_eh_inc_host_failed() to see a raised busy count, causing no CPU to\nsee a host busy equal to the host_failed count.\n\nThis race condition can be prevented with a memory barrier on the error\npath to force the write to be visible before counting host busy\ncommands.\n\nSecond, there is a general ordering issue with scsi_eh_inc_host_failed(). By\ncounting busy commands before incrementing host_failed, it can race with a\nfinal command in scsi_dec_host_busy(), such that scsi_dec_host_busy() does\nnot see host_failed incremented but scsi_eh_inc_host_failed() counts busy\ncommands before SCMD_STATE_INFLIGHT is cleared by scsi_dec_host_busy(),\nresulting in neither waking the error handler task.\n\nThis needs the call to scsi_host_busy() to be moved after host_failed is\nincremented to close the race condition."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/scsi/scsi_error.c", "drivers/scsi/scsi_lib.c"], "versions": [{"version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69", "lessThan": "cc872e35c0df80062abc71268d690a2f749e542e", "status": "affected", "versionType": "git"}, {"version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69", "lessThan": "6d9a367be356101963c249ebf10ea10b32886607", "status": "affected", "versionType": "git"}, {"version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69", "lessThan": "9fdc6f28d5e81350ab1d2cac8389062bd09e61e1", "status": "affected", "versionType": "git"}, {"version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69", "lessThan": "64ae21b9c4f0c7e60cf47a53fa7ab68852079ef0", "status": "affected", "versionType": "git"}, {"version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69", "lessThan": "219f009ebfd1ef3970888ee9eef4c8a06357f862", "status": "affected", "versionType": "git"}, {"version": "6eb045e092efefafc6687409a6fa6d1dabf0fb69", "lessThan": "fe2f8ad6f0999db3b318359a01ee0108c703a8c3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/scsi/scsi_error.c", "drivers/scsi/scsi_lib.c"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": 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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Wake up the error handler when final completions race against each other\n\nThe fragile ordering between marking commands completed or failed so\nthat the error handler only wakes when the last running command\ncompletes or times out has race conditions. These race conditions can\ncause the SCSI layer to fail to wake the error handler, leaving I/O\nthrough the SCSI host stuck as the error state cannot advance.\n\nFirst, there is an memory ordering issue within scsi_dec_host_busy().\nThe write which clears SCMD_STATE_INFLIGHT may be reordered with reads\ncounting in scsi_host_busy(). While the local CPU will see its own\nwrite, reordering can allow other CPUs in scsi_dec_host_busy() or\nscsi_eh_inc_host_failed() to see a raised busy count, causing no CPU to\nsee a host busy equal to the host_failed count.\n\nThis race condition can be prevented with a memory barrier on the error\npath to force the write to be visible before counting host busy\ncommands.\n\nSecond, there is a general ordering issue with scsi_eh_inc_host_failed(). By\ncounting busy commands before incrementing host_failed, it can race with a\nfinal command in scsi_dec_host_busy(), such that scsi_dec_host_busy() does\nnot see host_failed incremented but scsi_eh_inc_host_failed() counts busy\ncommands before SCMD_STATE_INFLIGHT is cleared by scsi_dec_host_busy(),\nresulting in neither waking the error handler task.\n\nThis needs the call to scsi_host_busy() to be moved after host_failed is\nincremented to close the race condition."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.249", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.162", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.122", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.68", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.8", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19", "versionStartIncluding": "5.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:00:19.004Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23110", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:41:47.379Z", "dateReserved": "2026-01-13T15:37:45.968Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-02-04T16:08:30.158Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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[{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C8F8CE97-601F-43DD-8822-7399EEB63A13", "versionEndExcluding": "5.10.249", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EF0253DB-B732-41D3-8F8B-4A5BA50106EE", "versionEndExcluding": "6.1.162", 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"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Wake up the error handler when final completions race against each other\n\nThe fragile ordering between marking commands completed or failed so\nthat the error handler only wakes when the last running command\ncompletes or times out has race conditions. These race conditions can\ncause the SCSI layer to fail to wake the error handler, leaving I/O\nthrough the SCSI host stuck as the error state cannot advance.\n\nFirst, there is an memory ordering issue within scsi_dec_host_busy().\nThe write which clears SCMD_STATE_INFLIGHT may be reordered with reads\ncounting in scsi_host_busy(). While the local CPU will see its own\nwrite, reordering can allow other CPUs in scsi_dec_host_busy() or\nscsi_eh_inc_host_failed() to see a raised busy count, causing no CPU to\nsee a host busy equal to the host_failed count.\n\nThis race condition can be prevented with a memory barrier on the error\npath to force the write to be visible before counting host busy\ncommands.\n\nSecond, there is a general ordering issue with scsi_eh_inc_host_failed(). By\ncounting busy commands before incrementing host_failed, it can race with a\nfinal command in scsi_dec_host_busy(), such that scsi_dec_host_busy() does\nnot see host_failed incremented but scsi_eh_inc_host_failed() counts busy\ncommands before SCMD_STATE_INFLIGHT is cleared by scsi_dec_host_busy(),\nresulting in neither waking the error handler task.\n\nThis needs the call to scsi_host_busy() to be moved after host_failed is\nincremented to close the race condition."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nscsi: core: Despertar al manejador de errores cuando las finalizaciones finales compiten entre s\u00ed\n\nEl ordenamiento fr\u00e1gil entre marcar comandos como completados o fallidos, de modo que el manejador de errores solo se despierte cuando el \u00faltimo comando en ejecuci\u00f3n se complete o agote el tiempo de espera, tiene condiciones de carrera. Estas condiciones de carrera pueden hacer que la capa SCSI no despierte al manejador de errores, dejando la E/S a trav\u00e9s del host SCSI atascada ya que el estado de error no puede avanzar.\n\nPrimero, hay un problema de ordenamiento de memoria dentro de scsi_dec_host_busy(). La escritura que borra SCMD_STATE_INFLIGHT puede reordenarse con lecturas que cuentan en scsi_host_busy(). Si bien la CPU local ver\u00e1 su propia escritura, la reordenaci\u00f3n puede permitir que otras CPU en scsi_dec_host_busy() o scsi_eh_inc_host_failed() vean un recuento de ocupaci\u00f3n elevado, lo que hace que ninguna CPU vea un host ocupado igual al recuento de host_failed.\n\nEsta condici\u00f3n de carrera puede evitarse con una barrera de memoria en la ruta de error para forzar que la escritura sea visible antes de contar los comandos de host ocupados.\n\nSegundo, hay un problema de ordenamiento general con scsi_eh_inc_host_failed(). Al contar los comandos ocupados antes de incrementar host_failed, puede competir con un comando final en scsi_dec_host_busy(), de modo que scsi_dec_host_busy() no ve host_failed incrementado, pero scsi_eh_inc_host_failed() cuenta los comandos ocupados antes de que SCMD_STATE_INFLIGHT sea borrado por scsi_dec_host_busy(), lo que resulta en que ninguno despierte la tarea del manejador de errores.\n\nEsto requiere que la llamada a scsi_host_busy() se mueva despu\u00e9s de que host_failed se incremente para cerrar la condici\u00f3n de carrera."}], "id": "CVE-2026-23110", "lastModified": "2026-11-10T13:18:35.413", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23110", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T20:40:51.689524Z", "version": "2.0.3"}}]}, "published": "2026-02-04T17:16:21.880", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/219f009ebfd1ef3970888ee9eef4c8a06357f862"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64ae21b9c4f0c7e60cf47a53fa7ab68852079ef0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d9a367be356101963c249ebf10ea10b32886607"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9fdc6f28d5e81350ab1d2cac8389062bd09e61e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc872e35c0df80062abc71268d690a2f749e542e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe2f8ad6f0999db3b318359a01ee0108c703a8c3"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: scsi: core: Wake up the error handler when final completions race against each other", "id": "2436755", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436755"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23110", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23110\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23110\nhttps://lore.kernel.org/linux-cve-announce/2026020431-CVE-2026-23110-56b1@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-18T13:49:29.435345+00:00", "value": {"mitigation_remediation": ["Upgrade the Linux kernel to a version that incorporates the fix for this race condition, such as a release that includes the listed commit set;", "Reboot the system so the new kernel is fully active and the offending race condition is resolved;", "If the patch cannot be applied immediately, monitor kernel logs for SCSI host errors and consider disabling or limiting SCSI services until a fixed kernel is available."], "summary": {"action": "Apply Patch", "impact": "Denial of Service due to stuck SCSI I/O"}, "threat_synthesis": {"affected_systems": "All Linux kernel builds that include the resident SCSI core implementation are susceptible, including the 6.19 release candidates (rc1 through rc6) and presumably later stable releases until the bug is patched. The problem is present in the core kernel, affecting any system that relies on SCSI host functionality.", "description_and_impact": "The vulnerability stems from a race condition in the Linux kernel\u2019s SCSI core that can prevent the error handler from being woken after the final command completes or times out. The issue arises from improper memory ordering between marking commands as complete or failed, causing the host busy count and failed count to become unsynchronized. As a result, SCSI host I/O operations can remain indefinitely stalled, effectively denying service on affected devices.", "risk_and_exploitability": "Based on the description, it is inferred that the attack vector is a race condition exploited during concurrent SCSI I/O commands. Exploitation would require precise timing of multiple concurrent SCSI commands and likely local or privileged access to the affected system. The CVSS score of 4.7 indicates a moderate severity. The EPSS score is below 1%, suggesting a very low likelihood of imminent exploitation, and the vulnerability is not listed in the CISA KEV catalog. While remote exploitation is improbable, an attacker with sufficient privileges could potentially abuse the race to render a device non\u2011functional. The main vector is race condition exploitation within kernel space during normal I/O operations."}}}}, "created": "2026-04-18T14:00:02.182893+00:00", "updated": "2026-04-18T14:00:02.182909+00:00", "vendors": []}