Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64014
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:41 UTC
Updated2026-07-19 16:17:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size nexio_read_data() pulls data_len and x_len from a packed __be16 header in the device's interrupt packet and then walks packet->data[0..x_len) and packet->data[x_len..data_len) 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 rept_size (1024) bytes from usb_alloc_coherent(), with the first 7 occupied by the packed header — so packet->data[] has 1017 valid bytes. read_data() callbacks are not given urb->actual_length, 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 NEXIO_THRESHOLD lands in begin_x / begin_y and from there into the reported touch coordinates, so adjacent kernel memory contents leak to userspace as ABS_X / ABS_Y events. Far enough out, the read can also hit an unmapped page and fault. Fix this all by clamping data_len to the buffer's data[] capacity and x_len to data_len.

Risk And Classification

EPSS: 0.001760000 probability, percentile 0.073880000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce 45c829e5eb3b974282bae50b7cca2cc891f74f0b git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce e7cdcb266ba06d8480809b78ab8bb2bf8ff51ccb git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce 95f47331dfde243f93e679ce70bd0c24b37c683d git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce d883312061ccde8c536595998aaf687ec070077c git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce 103d2de9f505f56da173e43f12dba62f92620278 git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce 0ca809ea8e0355299266c46e5f1755040aa8dcf3 git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce 7585b6aa55d8ac85ad22f522e1059f93507727b6 git Not specified
CNA Linux Linux affected 5197424cdcccd2b0b1922babb93969b2515c43ce 2905281cbda52ec9df540113b35b835feb5fafd3 git Not specified
CNA Linux Linux affected 2.6.34 Not specified
CNA Linux Linux unaffected 2.6.34 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2905281cbda52ec9df540113b35b835feb5fafd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45c829e5eb3b974282bae50b7cca2cc891f74f0b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ca809ea8e0355299266c46e5f1755040aa8dcf3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7585b6aa55d8ac85ad22f522e1059f93507727b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e7cdcb266ba06d8480809b78ab8bb2bf8ff51ccb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/95f47331dfde243f93e679ce70bd0c24b37c683d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/103d2de9f505f56da173e43f12dba62f92620278 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d883312061ccde8c536595998aaf687ec070077c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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