CVE-2026-23454

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This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. The\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\nmana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs\nafter kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()\ncan dereference freed caller_ctx (and rxq->msg_buf) in\nmana_hwc_handle_resp().\n\nFix this by reordering teardown to reverse-of-creation order: destroy\nthe TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This\nensures all in-flight interrupt handlers complete before the memory they\naccess is freed."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/microsoft/mana/hw_channel.c"], "versions": [{"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f", "lessThan": "b88edf12fc3779521ae5f6f1584153b15f7da6df", "status": "affected", "versionType": "git"}, {"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f", "lessThan": "e23bf444512cb85d76012080a76cd1f9e967448e", "status": "affected", "versionType": "git"}, {"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f", "lessThan": "249e905571583a434d4ea8d6f92ccc0eef337115", "status": "affected", "versionType": "git"}, {"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f", "lessThan": "2b001901f689021acd7bf2dceed74a1bdcaaa1f9", "status": "affected", "versionType": "git"}, {"version": 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"https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9"}, {"url": "https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c"}, {"url": "https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256"}, {"url": "https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87"}], "title": "net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-11-10T12:43:24.314Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": 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This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. The\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\nmana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs\nafter kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()\ncan dereference freed caller_ctx (and rxq->msg_buf) in\nmana_hwc_handle_resp().\n\nFix this by reordering teardown to reverse-of-creation order: destroy\nthe TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This\nensures all in-flight interrupt handlers complete before the memory they\naccess is freed."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.167", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.130", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.78", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.20", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.10", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:07:18.149Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23454", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:43:24.314Z", "dateReserved": "2026-01-13T15:37:46.020Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-03T15:15:36.189Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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has been resolved:\n\nnet: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown\n\nA potential race condition exists in mana_hwc_destroy_channel() where\nhwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and\nEvent Queue (EQ) are destroyed. This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. The\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\nmana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs\nafter kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()\ncan dereference freed caller_ctx (and rxq->msg_buf) in\nmana_hwc_handle_resp().\n\nFix this by reordering teardown to reverse-of-creation order: destroy\nthe TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This\nensures all in-flight interrupt handlers complete before the memory they\naccess is freed."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: mana: corrige uso despu\u00e9s de liberaci\u00f3n en mana_hwc_destroy_channel() reordenando el desmantelamiento\n\nExiste una potencial condici\u00f3n de carrera en mana_hwc_destroy_channel() donde hwc -> caller_ctx es liberado antes de que la Cola de Completado (CQ) y la Cola de Eventos (EQ) del HWC sean destruidas. Esto permite a un gestor de interrupciones de CQ en curso desreferenciar memoria liberada, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n o a una desreferencia de puntero NULL en mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() le indica al hardware que se detenga pero no se sincroniza con los gestores de IRQ que ya se est\u00e1n ejecutando en otras CPUs. La sincronizaci\u00f3n de IRQ solo ocurre en mana_hwc_destroy_cq() a trav\u00e9s de mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Dado que esto se ejecuta despu\u00e9s de kfree(hwc -> caller_ctx), un mana_hwc_rx_event_handler() concurrente puede desreferenciar caller_ctx liberado (y rxq -> msg_buf) en mana_hwc_handle_resp().\n\nSolucione esto reordenando el desmantelamiento al orden inverso de creaci\u00f3n: destruya las colas de trabajo TX/RX y CQ/EQ antes de liberar hwc -> caller_ctx. Esto asegura que todos los gestores de interrupciones en curso se completen antes de que la memoria a la que acceden sea liberada."}], "id": "CVE-2026-23454", "lastModified": "2026-11-10T13:18:47.370", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23454", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:31:29.654639Z", "version": "2.0.3"}}]}, "published": "2026-04-03T16:16:31.947", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b88edf12fc3779521ae5f6f1584153b15f7da6df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87"}, {"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-082556.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-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown", "id": "2454805", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454805"}, "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-825", "details": ["A flaw was found in the Linux kernel's mana network driver. A race condition during the destruction of a hardware completion queue (HWC) channel can lead to memory being freed while still in use. This use-after-free vulnerability allows an in-flight interrupt handler to dereference freed memory. This could potentially result in a system crash, leading to a Denial of Service (DoS), or in more severe cases, arbitrary code execution."], "name": "CVE-2026-23454", "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": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23454\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23454\nhttps://lore.kernel.org/linux-cve-announce/2026040317-CVE-2026-23454-a999@gregkh/T"], "threat_severity": "Moderate"}

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