CVE-2026-64333

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No uncontrollable race or memory layout is required.\nPR:L - No capability check exists in the ioctl path; the attacker only needs ordinary user-level permission to access the tty device node.\nUI:N - The attacker can open, write to, and issue the ioctl without another user performing any action.\nS:U - Compromise remains within the host kernel's security authority and is a standard local kernel privilege escalation rather than a VM, IOMMU, or distinct-scope escape.\nC:H - On controller-local-memory HCDs, the changed length can make USB completion restore the transfer-buffer pointer from attacker-controlled payload bytes. The resulting kernel-write and code-execution primitive can expose arbitrary kernel memory.\nI:H - A subsequent tty write dereferences the attacker-selected transfer-buffer pointer, providing an attacker-directed kernel overwrite with largely controlled contents. This can corrupt control data and plausibly achieve kernel code execution.\nA:H - The corrupted kernel pointer can immediately cause an oops or panic, while exploitation of the arbitrary overwrite can crash or hang the entire kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/serial/digi_acceleport.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "5d9dc88bdf8897788b0eed57113e9eca7fd42ea9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2f296974acc279f05f284441bfe3064074958d11", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e60e4873e9178da9f4f2674e4c2ff085d5a84f79", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", 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No uncontrollable race or memory layout is required.\nPR:L - No capability check exists in the ioctl path; the attacker only needs ordinary user-level permission to access the tty device node.\nUI:N - The attacker can open, write to, and issue the ioctl without another user performing any action.\nS:U - Compromise remains within the host kernel's security authority and is a standard local kernel privilege escalation rather than a VM, IOMMU, or distinct-scope escape.\nC:H - On controller-local-memory HCDs, the changed length can make USB completion restore the transfer-buffer pointer from attacker-controlled payload bytes. The resulting kernel-write and code-execution primitive can expose arbitrary kernel memory.\nI:H - A subsequent tty write dereferences the attacker-selected transfer-buffer pointer, providing an attacker-directed kernel overwrite with largely controlled contents. This can corrupt control data and plausibly achieve kernel code execution.\nA:H - The corrupted kernel pointer can immediately cause an oops or panic, while exploitation of the arbitrary overwrite can crash or hang the entire kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "5d9dc88bdf8897788b0eed57113e9eca7fd42ea9", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2f296974acc279f05f284441bfe3064074958d11", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e60e4873e9178da9f4f2674e4c2ff085d5a84f79", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "699dfb6917503b3cda4d5da6941cf79c3c1b4c8b", 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trigger due to INITIAL_JIFFIES).\n\nFix this by adding the missing return on timeout and waiting\nindefinitely when no timeout has been specified as intended.\n\nThis issue was (sort of) flagged by Sashiko when reviewing an unrelated\nchange to the driver."}], "id": "CVE-2026-64333", "lastModified": "2026-10-19T21:17:32.433", "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-2026-64333", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:39:14.688855Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:15.080", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1243f120790042c2ac92e84e797dacc75fff4366"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24ca1fea8f2753bf33e1d458ec1ae5d9b7796a65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f296974acc279f05f284441bfe3064074958d11"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d9dc88bdf8897788b0eed57113e9eca7fd42ea9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/699dfb6917503b3cda4d5da6941cf79c3c1b4c8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a274b3794fe1852c3d9fe6d900b94053c0b03410"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a3a13fdc53103b07335918e2cdeb465038a71725"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e60e4873e9178da9f4f2674e4c2ff085d5a84f79"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: USB: serial: digi_acceleport: fix write buffer corruption", "id": "2507072", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507072"}, "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"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's `digi_acceleport` USB serial driver. This vulnerability allows a local attacker with access to the affected USB serial device to corrupt the write buffer due to improper handling of write operations and timeouts. This could lead to arbitrary code execution, allowing the attacker to run malicious code, or cause system instability and denial of service (DoS)."], "name": "CVE-2026-64333", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "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": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64333\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64333\nhttps://lore.kernel.org/linux-cve-announce/2026072514-CVE-2026-64333-56ab@gregkh/T"], "threat_severity": "Moderate"}

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