CVE-2026-63898

USB: serial: mct_u232: fix memory corruption with small endpoint

State: Published
Severity: Not scored
Published: Jul 19, 2026
Updated: Jul 19, 2026
Reserved: 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 94edbbc5fe00d03cfe1d4e690d7d2cd36317a935Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bd2ddb3fe9052ad8703593bbec26ecc7ca92869eAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 39e295a91e80f3b91f61c7ada2bde434dcaba20dAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 90dbad14b109e5fdfb4934ff61e561d11ba3742dAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6cb48f8890f9b2051d7c34823057296a536a31c5Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d8fdf33d6fcfb90cbec26299baf2352c84b2d768Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 57f332af1745014cd7e40414814ffaa6bc7d3b5bAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 915b36d701950503c4ea0f6e314b10868e59fce3Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.12 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 94edbbc5fe00d03cfe1d4e690d7d2cd36317a935Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bd2ddb3fe9052ad8703593bbec26ecc7ca92869eAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 39e295a91e80f3b91f61c7ada2bde434dcaba20dAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 90dbad14b109e5fdfb4934ff61e561d11ba3742dAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6cb48f8890f9b2051d7c34823057296a536a31c5Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d8fdf33d6fcfb90cbec26299baf2352c84b2d768Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 57f332af1745014cd7e40414814ffaa6bc7d3b5bAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 915b36d701950503c4ea0f6e314b10868e59fce3Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.12 through 7.0.*Not affected
7.1 and laterNot affected

References

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