CVE-2026-23021

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"https://git.kernel.org/stable/c/5397ea6d21c35a17707e201a60761bdee00bcc4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93f18eaa190374e0f2d253e3b1a65cee19a7abe6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a40af9a2904a1ab8ce61866ebe2a894ef30754ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac5d92d2826dec51e5d4c6854865bc5817277452"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/afa27621a28af317523e0836dad430bec551eb54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce6eef731aba23a988decea1df3b08cf978f7b01"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: usb: pegasus: fix memory leak in update_eth_regs_async()", "id": "2435665", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2435665"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: usb: pegasus: fix memory leak in update_eth_regs_async()\nWhen asynchronously writing to the device registers and if usb_submit_urb()\nfail, the code fail to release allocated to this point resources."], "name": "CVE-2026-23021", "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": "Under investigation", "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": "2026-01-31T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23021\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23021\nhttps://lore.kernel.org/linux-cve-announce/2026013136-CVE-2026-23021-8fc2@gregkh/T"], "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T00:57:23.134491+00:00", "value": {"mitigation_remediation": ["Apply the vendor\u2011supplied kernel patch that releases freed resources when usb_submit_urb() fails. Refer to the kernel commit at https://git.kernel.org/stable/c/471dfb97599eec74e0476046b3ef8e7037f27b34 for details", "If patching is not immediately possible, disable or block the Pegasus USB driver for untrusted devices, or use secure boot to restrict loading of unsigned kernel modules", "Monitor system memory usage and kernel logs for repeated URB failures; schedule a reboot or driver reload if memory consumption grows unbounded"], "summary": {"action": "Patch Update", "impact": "Memory Leak leading to Resource Exhaustion"}, "threat_synthesis": {"affected_systems": "Any Linux kernel system that includes the Pegasus USB driver, including mainstream releases and the 6.19 release candidates. The affected code is part of the USB networking subsystem of the Linux kernel, so any distribution shipping a kernel with that driver is potentially compromised.", "description_and_impact": "The vulnerability is a memory leak in the Pegasus USB device driver. When an asynchronous register write operation fails, the driver fails to release allocated resources, allowing the leak to accumulate. This can eventually exhaust system memory and degrade performance or cause a denial of service. The flaw is a classic memory management issue, classified as CWE\u2011401.", "risk_and_exploitability": "The CVSS score of 5.5 indicates moderate severity. The EPSS score of less than 1% suggests that exploitation is unlikely, and the vulnerability is not yet listed in the CISA KEV catalog. The attack vector appears to be local or requires elevated privileges, as the attacker must provoke a failed USB submit operation in the driver. Based on the description, it is inferred that the vulnerability requires some control over the USB device or kernel module interactions, making it an indirect yet realistic risk for systems that accept unmanaged USB devices."}}}}, "created": "2026-04-18T01:00:11.631055+00:00", "updated": "2026-04-18T01:00:11.631065+00:00", "vendors": []}