CVE-2026-63898
Published Jul 19, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: mct_u232: fix memory corruption with small endpoint The driver overrides the maximum transfer size for a specific device which only accepts 16 byte packets for its 32 byte bulk-out endpoint. Make sure to never increase the maximum transfer size to prevent slab corruption should a malicious device report a smaller endpoint max packet size than expected.
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EPSS — Exploit Prediction
0.0021
Probability of exploitation
0.11%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/39e295a91e80f3b91f61c7ada2bde434dcaba20d
https://git.kernel.org/stable/c/57f332af1745014cd7e40414814ffaa6bc7d3b5b
https://git.kernel.org/stable/c/6cb48f8890f9b2051d7c34823057296a536a31c5
https://git.kernel.org/stable/c/90dbad14b109e5fdfb4934ff61e561d11ba3742d
https://git.kernel.org/stable/c/915b36d701950503c4ea0f6e314b10868e59fce3
https://git.kernel.org/stable/c/94edbbc5fe00d03cfe1d4e690d7d2cd36317a935
https://git.kernel.org/stable/c/bd2ddb3fe9052ad8703593bbec26ecc7ca92869e
https://git.kernel.org/stable/c/d8fdf33d6fcfb90cbec26299baf2352c84b2d768
Frequently Asked Questions
What is CVE-2026-63898? +
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: mct_u232: fix memory corruption with small endpoint
The driver overrides the maximum transfer size for a specific device
which only accepts 16 byte packets for its 32 byte bulk-out endpoint.
Make sure to never increase the maximum transfer size to prevent slab
corruption should a malicious device report a smaller endpoint max
packet size than expected.
How do I check if I'm vulnerable to CVE-2026-63898? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.