CVE-2026-64014: Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size
In the Linux kernel, the following vulnerability has been resolved:
Input: usbtouchscreen - clamp NEXIO datalen/xlen to URB buffer size
nexioreaddata() pulls datalen and xlen from a packed be16 header in the device's interrupt packet and then walks packet->data[0..xlen) and packet->data[xlen..datalen) comparing each byte against a threshold.
Both fields are 16-bit on the wire (max 65535). The existing adjustments shave at most 0x100 / 0x80 off, so the loop bound can still reach roughly 0xfeff. The URB transfer buffer for NEXIO is reptsize (1024) bytes from usballoccoherent(), with the first 7 occupied by the packed header — so packet->data[] has 1017 valid bytes. readdata() callbacks are not given urb->actuallength, and nothing else bounds the walk.
A device that lies about its length can get a ~64 KiB out-of-bounds read past the coherent DMA allocation. The first index whose byte exceeds NEXIOTHRESHOLD lands in beginx / beginy and from there into the reported touch coordinates, so adjacent kernel memory contents leak to userspace as ABSX / ABSY events. Far enough out, the read can also hit an unmapped page and fault.
Fix this all by clamping datalen to the buffer's data[] capacity and xlen to datalen.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1118.128+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.8.0-146.146 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.8.0-1070.78 - Upgrade
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ubuntu/linux-gcp-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-1011.11~24.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1065.73 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 6.8.0-1051.55 - Upgrade
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ubuntu/linux-hwe-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-28.28~24.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 6.8.0-1066.67 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-146.146.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1064.67 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1063.66 - Upgrade
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ubuntu/linux-oracle-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-1011.11~24.04.1 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.8.1-1061.62 - Upgrade
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1066.69+fips1 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1069.77+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-146.146+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1070.78+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-28.28 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1009.9 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 7.0.0-1010.10 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1008.8 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 7.0.0-1003.4 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 7.0.0-1010.10 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 7.0.0-1016.16 - Upgrade
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ubuntu/linux-nvidia-bosto a version that resolves this vulnerability.Fixed in 7.0.0-2016.16 - Upgrade
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ubuntu/linux-oem-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-1009.9 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 7.0.0-1008.8 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 7.0.0-1015.15 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 7.0.0-28.28.1 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-28.28.1 - Compensating control
In the Linux kernel Input: usbtouchscreen NEXIO handler, clamp data_len to the packet->data[] buffer capacity (1017 bytes for the 1024-byte URB buffer with a 7-byte header), then clamp x_len to data_len before walking the data buffer.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64014?
The severity of CVE-2026-64014 is rated at 57, indicating a moderate risk.
How do I fix CVE-2026-64014?
To fix CVE-2026-64014, update your Linux kernel to the latest version where this vulnerability is patched.
What does CVE-2026-64014 affect?
CVE-2026-64014 affects the usbtouchscreen driver within the Linux kernel.
What type of vulnerability is CVE-2026-64014?
CVE-2026-64014 is an input validation vulnerability that impacts data processing in the usbtouchscreen driver.
What could happen if CVE-2026-64014 is exploited?
If exploited, CVE-2026-64014 could lead to buffer overflow issues, potentially allowing for arbitrary code execution.