CVE-2026-31769

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31769", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.140Z", "datePublished": "2026-05-01T14:14:58.617Z", "dateUpdated": "2026-08-05T12:25:02.500Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:02.500Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpib: fix use-after-free in IO ioctl handlers\n\nThe IBRD, IBWRT, IBCMD, and IBWAIT ioctl handlers use a gpib_descriptor\npointer after board->big_gpib_mutex has been released. A concurrent\nIBCLOSEDEV ioctl can free the descriptor via close_dev_ioctl() during\nthis window, causing a use-after-free.\n\nThe IO handlers (read_ioctl, write_ioctl, command_ioctl) explicitly\nrelease big_gpib_mutex before calling their handler. wait_ioctl() is\ncalled with big_gpib_mutex held, but ibwait() releases it internally\nwhen wait_mask is non-zero. In all four cases, the descriptor pointer\nobtained from handle_to_descriptor() becomes unprotected.\n\nFix this by introducing a kernel-only descriptor_busy reference count\nin struct gpib_descriptor. Each handler atomically increments\ndescriptor_busy under file_priv->descriptors_mutex before releasing the\nlock, and decrements it when done. close_dev_ioctl() checks\ndescriptor_busy under the same lock and rejects the close with -EBUSY\nif the count is non-zero.\n\nA reference count rather than a simple flag is necessary because\nmultiple handlers can operate on the same descriptor concurrently\n(e.g. IBRD and IBWAIT on the same handle from different threads).\n\nA separate counter is needed because io_in_progress can be cleared from\nunprivileged userspace via the IBWAIT ioctl (through general_ibstatus()\nwith set_mask containing CMPL), which would allow an attacker to bypass\na check based solely on io_in_progress. The new descriptor_busy\ncounter is only modified by the kernel IO paths.\n\nThe lock ordering is consistent (big_gpib_mutex -> descriptors_mutex)\nand the handlers only hold descriptors_mutex briefly during the lookup,\nso there is no deadlock risk and no impact on IO throughput."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached through local `/dev/gpibN` character-device ioctls such as `IBRD`, `IBWRT`, `IBCMD`, `IBWAIT`, and `IBCLOSEDEV`. There is no network, adjacent, or physical packet-processing entry point for this bug.\nAC:L - The attacker controls both sides of the race by issuing concurrent ioctls on the same GPIB file descriptor and handle. Use-after-free triggering does not depend on conditions outside attacker control once the board is online and accessible.\nPR:L - The vulnerable ioctls do not perform capability checks; a local user with access to the GPIB device node can open a descriptor, run IO or wait operations, and concurrently close it. Administrative privileges are needed for board configuration, but not for the vulnerable open/close/IO path in a configured deployment.\nUI:N - No victim action is required after the attacker has local access to the device. Exploitation is performed entirely by attacker-controlled ioctl calls.\nS:U - The bug is a kernel use-after-free reachable from a local kernel device interface and impacts the same kernel security authority. It does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel heap use-after-free of `struct gpib_descriptor`, and freed object reuse can expose or help derive kernel memory contents. Following the required kernel guidance, use-after-free bugs are scored as high confidentiality impact.\nI:H - The stale descriptor pointer is dereferenced after free and can be overlapped through heap reuse, giving a plausible path to corrupt kernel data or build write/control-flow primitives. Following the required kernel guidance, use-after-free bugs are scored as high integrity impact.\nA:H - The stale pointer can be dereferenced after `kfree()` during IO or wait completion, making kernel oops, panic, or hang plausible. Use-after-free bugs are therefore high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpib/common/gpib_os.c", "drivers/gpib/include/gpib_types.h"], "versions": [{"version": "9dde4559e93955ccc47d588f7fd051684d55c4e7", "lessThan": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c", "status": "affected", "versionType": "git"}, {"version": "9dde4559e93955ccc47d588f7fd051684d55c4e7", "lessThan": "28c75dd143ead62e0dfac564c79d251e21d5d74b", "status": "affected", "versionType": "git"}, {"version": "9dde4559e93955ccc47d588f7fd051684d55c4e7", "lessThan": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6", "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/gpib/common/gpib_os.c", "drivers/gpib/include/gpib_types.h"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.13", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c"}, {"url": "https://git.kernel.org/stable/c/28c75dd143ead62e0dfac564c79d251e21d5d74b"}, {"url": "https://git.kernel.org/stable/c/d1857f8296dceb75d00ab857fc3c61bc00c7f5c6"}], "title": "gpib: fix use-after-free in IO ioctl handlers", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpib/common/gpib_os.c", "drivers/gpib/include/gpib_types.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c", "status": "affected", "version": "9dde4559e93955ccc47d588f7fd051684d55c4e7", "versionType": "git"}, {"lessThan": "28c75dd143ead62e0dfac564c79d251e21d5d74b", "status": "affected", "version": "9dde4559e93955ccc47d588f7fd051684d55c4e7", "versionType": "git"}, {"lessThan": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6", "status": "affected", "version": "9dde4559e93955ccc47d588f7fd051684d55c4e7", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpib/common/gpib_os.c", "drivers/gpib/include/gpib_types.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"lessThan": "6.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.22", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029", "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpib: fix use-after-free in IO ioctl handlers\n\nThe IBRD, IBWRT, IBCMD, and IBWAIT ioctl handlers use a gpib_descriptor\npointer after board->big_gpib_mutex has been released. A concurrent\nIBCLOSEDEV ioctl can free the descriptor via close_dev_ioctl() during\nthis window, causing a use-after-free.\n\nThe IO handlers (read_ioctl, write_ioctl, command_ioctl) explicitly\nrelease big_gpib_mutex before calling their handler. wait_ioctl() is\ncalled with big_gpib_mutex held, but ibwait() releases it internally\nwhen wait_mask is non-zero. In all four cases, the descriptor pointer\nobtained from handle_to_descriptor() becomes unprotected.\n\nFix this by introducing a kernel-only descriptor_busy reference count\nin struct gpib_descriptor. Each handler atomically increments\ndescriptor_busy under file_priv->descriptors_mutex before releasing the\nlock, and decrements it when done. close_dev_ioctl() checks\ndescriptor_busy under the same lock and rejects the close with -EBUSY\nif the count is non-zero.\n\nA reference count rather than a simple flag is necessary because\nmultiple handlers can operate on the same descriptor concurrently\n(e.g. IBRD and IBWAIT on the same handle from different threads).\n\nA separate counter is needed because io_in_progress can be cleared from\nunprivileged userspace via the IBWAIT ioctl (through general_ibstatus()\nwith set_mask containing CMPL), which would allow an attacker to bypass\na check based solely on io_in_progress. The new descriptor_busy\ncounter is only modified by the kernel IO paths.\n\nThe lock ordering is consistent (big_gpib_mutex -> descriptors_mutex)\nand the handlers only hold descriptors_mutex briefly during the lookup,\nso there is no deadlock risk and no impact on IO throughput."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ngpib: correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en los gestores ioctl de E/S\n\nLos gestores ioctl IBRD, IBWRT, IBCMD e IBWAIT usan un puntero gpib_descriptor despu\u00e9s de que board -> big_gpib_mutex ha sido liberado. Un ioctl IBCLOSEDEV concurrente puede liberar el descriptor a trav\u00e9s de close_dev_ioctl() durante esta ventana, causando un uso despu\u00e9s de liberaci\u00f3n.\n\nLos gestores de E/S (read_ioctl, write_ioctl, command_ioctl) liberan expl\u00edcitamente big_gpib_mutex antes de llamar a su gestor. wait_ioctl() se llama con big_gpib_mutex retenido, pero ibwait() lo libera internamente cuando wait_mask es distinto de cero. En los cuatro casos, el puntero del descriptor obtenido de handle_to_descriptor() queda desprotegido.\n\nEsto se soluciona introduciendo un contador de referencias descriptor_busy solo para el kernel en la estructura gpib_descriptor. Cada gestor incrementa at\u00f3micamente descriptor_busy bajo file_priv -> descriptors_mutex antes de liberar el bloqueo, y lo decrementa al finalizar. close_dev_ioctl() comprueba descriptor_busy bajo el mismo bloqueo y rechaza el cierre con -EBUSY si el contador es distinto de cero.\n\nEs necesario un contador de referencias en lugar de un simple indicador porque m\u00faltiples gestores pueden operar sobre el mismo descriptor concurrentemente (por ejemplo, IBRD e IBWAIT en el mismo identificador desde hilos diferentes).\n\nSe necesita un contador separado porque io_in_progress puede borrarse desde el espacio de usuario sin privilegios a trav\u00e9s del ioctl IBWAIT (mediante general_ibstatus() con set_mask conteniendo CMPL), lo que permitir\u00eda a un atacante eludir una comprobaci\u00f3n basada \u00fanicamente en io_in_progress. El nuevo contador descriptor_busy solo es modificado por las rutas de E/S del kernel.\n\nEl orden de bloqueo es consistente (big_gpib_mutex -> descriptors_mutex) y los gestores solo retienen descriptors_mutex brevemente durante la b\u00fasqueda, por lo que no hay riesgo de interbloqueo ni impacto en el rendimiento de E/S."}], "id": "CVE-2026-31769", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-01T15:16:40.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28c75dd143ead62e0dfac564c79d251e21d5d74b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1857f8296dceb75d00ab857fc3c61bc00c7f5c6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: gpib: fix use-after-free in IO ioctl handlers", "id": "2464442", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464442"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's gpib module. This use-after-free vulnerability allows a local attacker to trigger a condition where memory is accessed after it has been freed. By concurrently calling specific ioctl handlers, an attacker could cause a system crash, leading to a denial of service, or potentially execute arbitrary code with elevated privileges."], "name": "CVE-2026-31769", "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31769\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31769\nhttps://lore.kernel.org/linux-cve-announce/2026050148-CVE-2026-31769-8cd1@gregkh/T"]}

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