CVE-2026-23085

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Since all memory below\nthe 4GB physical address limit is in ZONE_DMA in this configuration,\nkmalloc() defaults to higher addresses for ZONE_NORMAL, and the\nITS driver stores the physical address in a 32-bit 'unsigned long'\nvariable.\n\nChange the itt_addr variable to the correct phys_addr_t type instead,\nalong with all other variables in this driver that hold a physical\naddress.\n\nThe gicv5 driver correctly uses u64 variables, while all other irqchip\ndrivers don't call virt_to_phys or similar interfaces. It's expected that\nother device drivers have similar issues, but fixing this one is\nsufficient for booting a virtio based guest."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/irqchip/irq-gic-v3-its.c"], "versions": [{"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "e332b3b69e5b3acf07204a4b185071bab15c2b88", "status": "affected", "versionType": "git"}, {"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "e2f9c751f73a2d5bb62d94ab030aec118a811f27", "status": "affected", "versionType": "git"}, {"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "85215d633983233809f7d4dad163b953331b8238", "status": "affected", "versionType": "git"}, {"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "1b323391560354d8c515de8658b057a1daa82adb", "status": "affected", "versionType": "git"}, {"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "084ba3b99f2dfd991ce7e84fb17117319ec3cd9f", "status": "affected", "versionType": "git"}, {"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98", "status": "affected", "versionType": "git"}, {"version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e", "lessThan": "8d76a7d89c12d08382b66e2f21f20d0627d14859", "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/irqchip/irq-gic-v3-its.c"], "versions": [{"version": "3.19", "status": "affected"}, {"version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.249", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.199", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.162", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.122", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.68", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.8", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.10.249"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.15.199"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.162"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.122"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.12.68"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.18.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88"}, {"url": "https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27"}, {"url": "https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238"}, {"url": "https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adb"}, {"url": "https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9f"}, {"url": "https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98"}, {"url": "https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859"}], "title": "irqchip/gic-v3-its: Avoid truncating memory addresses", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23085", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-10T20:40:42.445145Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:25:29.916Z"}}]}}

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Since all memory below\nthe 4GB physical address limit is in ZONE_DMA in this configuration,\nkmalloc() defaults to higher addresses for ZONE_NORMAL, and the\nITS driver stores the physical address in a 32-bit 'unsigned long'\nvariable.\n\nChange the itt_addr variable to the correct phys_addr_t type instead,\nalong with all other variables in this driver that hold a physical\naddress.\n\nThe gicv5 driver correctly uses u64 variables, while all other irqchip\ndrivers don't call virt_to_phys or similar interfaces. It's expected that\nother device drivers have similar issues, but fixing this one is\nsufficient for booting a virtio based guest."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.249", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.199", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.162", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.122", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.68", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.8", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19", "versionStartIncluding": "3.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:59:42.618Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23085", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:25:29.916Z", "dateReserved": "2026-01-13T15:37:45.961Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-02-04T16:08:09.368Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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for lowmem\nallocations to be backed by addresses physical memory above the 32-bit\naddress limit, as found while experimenting with larger VMSPLIT\nconfigurations.\n\nThis caused the qemu virt model to crash in the GICv3 driver, which\nallocates the 'itt' object using GFP_KERNEL. Since all memory below\nthe 4GB physical address limit is in ZONE_DMA in this configuration,\nkmalloc() defaults to higher addresses for ZONE_NORMAL, and the\nITS driver stores the physical address in a 32-bit 'unsigned long'\nvariable.\n\nChange the itt_addr variable to the correct phys_addr_t type instead,\nalong with all other variables in this driver that hold a physical\naddress.\n\nThe gicv5 driver correctly uses u64 variables, while all other irqchip\ndrivers don't call virt_to_phys or similar interfaces. It's expected that\nother device drivers have similar issues, but fixing this one is\nsufficient for booting a virtio based guest."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nirqchip/gic-v3-its: Evitar la truncaci\u00f3n de direcciones de memoria\n\nEn m\u00e1quinas de 32 bits con CONFIG_ARM_LPAE, es posible que las asignaciones de memoria baja est\u00e9n respaldadas por direcciones de memoria f\u00edsica por encima del l\u00edmite de direcciones de 32 bits, como se descubri\u00f3 al experimentar con configuraciones VMSPLIT m\u00e1s grandes.\n\nEsto caus\u00f3 que el modelo virt de qemu colapsara en el controlador GICv3, que asigna el objeto 'itt' usando GFP_KERNEL. Dado que toda la memoria por debajo del l\u00edmite de direcciones f\u00edsicas de 4 GB est\u00e1 en ZONE_DMA en esta configuraci\u00f3n, kmalloc() por defecto utiliza direcciones m\u00e1s altas para ZONE_NORMAL, y el controlador ITS almacena la direcci\u00f3n f\u00edsica en una variable 'unsigned long' de 32 bits.\n\nCambiar la variable itt_addr al tipo correcto phys_addr_t en su lugar, junto con todas las dem\u00e1s variables en este controlador que contienen una direcci\u00f3n f\u00edsica.\n\nEl controlador gicv5 utiliza correctamente variables u64, mientras que todos los dem\u00e1s controladores irqchip no llaman a virt_to_phys o interfaces similares. Se espera que otros controladores de dispositivos tengan problemas similares, pero solucionar este es suficiente para arrancar un invitado basado en virtio."}], "id": "CVE-2026-23085", "lastModified": "2026-10-19T19:17:35.147", "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-2026-23085", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T20:40:42.445145Z", "version": "2.0.3"}}]}, "published": "2026-02-04T17:16:19.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: irqchip/gic-v3-its: Avoid truncating memory addresses", "id": "2436828", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436828"}, "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-2026-23085", "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": "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": "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-2026-23085\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23085\nhttps://lore.kernel.org/linux-cve-announce/2026020423-CVE-2026-23085-14e2@gregkh/T"], "threat_severity": "Low"}

{"created": "2026-04-18T18:30:07.293519+00:00", "updated": "2026-10-23T11:30:17.155224+00:00", "vendors": []}