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CVE-2026-63957: USB: serial: safe_serial: fix memory corruption with small endpoint

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-30
• Weakness: CWE-787

Description

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

Affected products

• Linux kernel: from 2.6.12.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35
• Linux kernel: 2.6.12 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.6.143; Linux kernel 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/161ea0e5236f5f051d2d85d6c54dd08ee9dc7ba4
• https://git.kernel.org/stable/c/438061ed1ad85e6743e2dce826671772d81089ec
• https://git.kernel.org/stable/c/857b3cc73f91871ae4433f8b97c4670b78f8dc96
• https://git.kernel.org/stable/c/9b3145b3001fb24de1da72d1deb0bea70e5a078b
• https://git.kernel.org/stable/c/a550ed2117ca4709d38f713933ff924a83942e41
• https://git.kernel.org/stable/c/c7336c0fba5c959249f3d793d33076b992ec3ee4
• https://git.kernel.org/stable/c/e3a1d6eee25dc96b1d2db0ecd9d8741e92056476
• https://git.kernel.org/stable/c/f793b67d41e5fab719c5a90baa77cbd2fe259517

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