CVE-2026-63899

USB: serial: mxuport: fix memory corruption with small endpoint

HIGH

7.8

CVSS Score

Published: July 19, 2026 at 02:55 PM UTC

Updated: October 30, 2026 at 02:38 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

3.14 ≤ v < 5.10.2595.11 ≤ v < 5.15.2105.16 ≤ v < 6.1.1766.13 ≤ v < 6.18.356.19 ≤ v < 7.0.126.2 ≤ v < 6.6.1436.7 ≤ v < 6.12.933.14 7.1ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e

Vendor states this is fixed in 086b858b5f5125bc9d967ea2bd825f83d9f8f29d (fixed)

Vendor states this is fixed in 2f3661eb2446e1ef593da45e01a3b21a906768ec (fixed)

Vendor states this is fixed in 4085f0dbb1ce2251c9a5938d693de6593f0ab2bd (fixed)

Vendor states this is fixed in 6c0cf56f00f280d72180bb6ce79741bc787a6269 (fixed)

Vendor states this is fixed in b40166b4ef96067620a0f248e74ad9658c8f680c (fixed)

Vendor states this is fixed in be3a1ed4ae51fa8dde57383277d336ce834f2cd9 (fixed)

Vendor states this is fixed in ccbec56f2f9af008f1574335cc6a668f16603e47 (fixed)

Vendor states this is fixed in e906545641d34fb1a09a65b4b5cfdff40eb09681 (fixed)

Vendor states this is fixed in 3.14 (unaffected)

Vendor states this is fixed in 5.10.259 (unaffected)

Vendor states this is fixed in 5.15.210 (unaffected)

Vendor states this is fixed in 6.1.176 (unaffected)