CVE-2026-31758

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Call usbtmc_draw_down() to allow anchored URBs to be completed."}], "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 path is reached through local syscalls on the registered /dev/usbtmc* character device: open, asynchronous ioctl/read/write submission, then release. A USBTMC device must be present, but exploitation is driven from local device-file operations rather than network traffic.\nAC:L - The attacker can deliberately submit asynchronous URBs and drop the file reference before completion; the missing release-time drawdown makes the UAF deterministic enough to trigger. Any completion timing needed can be influenced by repeated attempts and, in the strongest scenario, by a controlled USBTMC device.\nPR:L - There are no capability or namespace-sensitive privilege checks in the usbtmc open/ioctl/release path. The attacker only needs ordinary local access sufficient to open the /dev/usbtmc* node.\nUI:N - No separate victim action is required once the attacker can access the device node. The attacker can open the file, issue the async operation, and cause release themselves.\nS:U - The corruption occurs within kernel USB/driver memory and affects the same kernel security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary escape by itself.\nC:H - This is a use-after-free of per-file kernel state containing embedded USB anchors and callback context. Per the kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - The HCD giveback path and completion callbacks write through freed file_data/anchor memory, giving a heap corruption primitive. UAF corruption is defensibly scored as high integrity impact because it can support arbitrary write or control-flow exploitation.\nA:H - Syzbot reproduced a KASAN slab-use-after-free write in the USB giveback path after usbtmc_release freed the object. Even without full exploitation, this can crash or destabilize the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/class/usbtmc.c"], "versions": [{"version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "959ef329071136e4335b54822fe2f607659b4569", "status": "affected", "versionType": "git"}, {"version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "e189d443767f7cd390c52f2e122e1fc41c7562d6", "status": "affected", "versionType": "git"}, {"version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f", "status": "affected", "versionType": "git"}, {"version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "95e09b07e50290254b28b8395509473104518f8c", "status": "affected", "versionType": "git"}, {"version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": 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A USBTMC device must be present, but exploitation is driven from local device-file operations rather than network traffic.\nAC:L - The attacker can deliberately submit asynchronous URBs and drop the file reference before completion; the missing release-time drawdown makes the UAF deterministic enough to trigger. Any completion timing needed can be influenced by repeated attempts and, in the strongest scenario, by a controlled USBTMC device.\nPR:L - There are no capability or namespace-sensitive privilege checks in the usbtmc open/ioctl/release path. The attacker only needs ordinary local access sufficient to open the /dev/usbtmc* node.\nUI:N - No separate victim action is required once the attacker can access the device node. The attacker can open the file, issue the async operation, and cause release themselves.\nS:U - The corruption occurs within kernel USB/driver memory and affects the same kernel security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary escape by itself.\nC:H - This is a use-after-free of per-file kernel state containing embedded USB anchors and callback context. Per the kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - The HCD giveback path and completion callbacks write through freed file_data/anchor memory, giving a heap corruption primitive. UAF corruption is defensibly scored as high integrity impact because it can support arbitrary write or control-flow exploitation.\nA:H - Syzbot reproduced a KASAN slab-use-after-free write in the USB giveback path after usbtmc_release freed the object. Even without full exploitation, this can crash or destabilize the kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "959ef329071136e4335b54822fe2f607659b4569", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "e189d443767f7cd390c52f2e122e1fc41c7562d6", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "95e09b07e50290254b28b8395509473104518f8c", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "977b632db51d231dec0bc571089a5c2402674139", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "d40198de50232e04c14c6e2092e896766c95ea48", "versionType": "git"}, {"status": "affected", "version": "4f3c8d6eddc272b386464524235440a418ed2029", "lessThan": "8a768552f7a8276fb9e01d49773d2094ace7c8f1", "versionType": "git"}], "programFiles": ["drivers/usb/class/usbtmc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"status": "unaffected", "version": "0", "lessThan": "4.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.253", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.168", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.134", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/usb/class/usbtmc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/959ef329071136e4335b54822fe2f607659b4569"}, {"url": "https://git.kernel.org/stable/c/e189d443767f7cd390c52f2e122e1fc41c7562d6"}, {"url": "https://git.kernel.org/stable/c/7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f"}, {"url": "https://git.kernel.org/stable/c/95e09b07e50290254b28b8395509473104518f8c"}, {"url": "https://git.kernel.org/stable/c/d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1"}, {"url": "https://git.kernel.org/stable/c/977b632db51d231dec0bc571089a5c2402674139"}, {"url": "https://git.kernel.org/stable/c/d40198de50232e04c14c6e2092e896766c95ea48"}, {"url": "https://git.kernel.org/stable/c/8a768552f7a8276fb9e01d49773d2094ace7c8f1"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: usbtmc: Flush anchored URBs in usbtmc_release\n\nWhen calling usbtmc_release, pending anchored URBs must be flushed or\nkilled to prevent use-after-free errors (e.g. in the HCD giveback\npath). 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Call usbtmc_draw_down() to allow anchored URBs to be completed."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nusb: usbtmc: Vaciar URBs anclados en usbtmc_release\n\nAl llamar a usbtmc_release, los URBs anclados pendientes deben vaciarse o eliminarse para evitar errores de uso despu\u00e9s de liberaci\u00f3n (p. ej., en la ruta de devoluci\u00f3n de HCD). Llamar a usbtmc_draw_down() para permitir que los URBs anclados se completen."}], "id": "CVE-2026-31758", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31758", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:13:00.464457Z", "version": "2.0.3"}}]}, "published": "2026-05-01T15:16:38.807", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7fa8f61bab3fb75b5deba8a0f3abb74dc5068d9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a768552f7a8276fb9e01d49773d2094ace7c8f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/959ef329071136e4335b54822fe2f607659b4569"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95e09b07e50290254b28b8395509473104518f8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/977b632db51d231dec0bc571089a5c2402674139"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d13318dec0c1e0e2ac16f8ecbd522db14cea4bb1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d40198de50232e04c14c6e2092e896766c95ea48"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e189d443767f7cd390c52f2e122e1fc41c7562d6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: usb: usbtmc: Flush anchored URBs in usbtmc_release", "id": "2464493", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464493"}, "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 usbtmc module. This vulnerability occurs because pending anchored Universal Serial Bus (USB) Request Blocks (URBs) are not flushed or killed when the usbtmc_release function is called. This can result in use-after-free errors, which could potentially lead to system crashes or, in some scenarios, arbitrary code execution."], "name": "CVE-2026-31758", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31758\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31758\nhttps://lore.kernel.org/linux-cve-announce/2026050144-CVE-2026-31758-8487@gregkh/T"], "threat_severity": "Moderate"}

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