In the Linux kernel, the following vulnerability has been resolved: USB: serial: safe_serial: fix memory corruption with small endpoint Make sure… (CVE-2026-63957)
A memory corruption vulnerability in the Linux kernel's USB serial safe_serial driver has been resolved. The issue occurs when a malicious USB device reports a bulk-out endpoint size smaller than eight bytes, potentially causing user-controlled slab corruption in safe mode. The fix ensures the bulk-out buffer size is at least eight bytes to prevent this condition.
AI Analysis
Technical Summary
This vulnerability in the Linux kernel affects the USB serial safe_serial driver. It arises from improper handling of small endpoint sizes, where the bulk-out buffer size was not validated to be at least eight bytes. This could lead to memory corruption controlled by a malicious USB device. The vulnerability has been addressed by enforcing a minimum buffer size requirement to avoid slab corruption in safe mode.
Potential Impact
The vulnerability could allow a malicious USB device to cause memory corruption within the kernel's USB serial driver. This may lead to system instability or potential escalation of privileges if exploited. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel by ensuring the bulk-out buffer size is at least eight bytes. Users should apply the official kernel updates that include this patch once available. Patch status is not yet confirmed in the provided data — check the vendor advisory for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: USB: serial: safe_serial: fix memory corruption with small endpoint Make sure… (CVE-2026-63957)
Description
A memory corruption vulnerability in the Linux kernel's USB serial safe_serial driver has been resolved. The issue occurs when a malicious USB device reports a bulk-out endpoint size smaller than eight bytes, potentially causing user-controlled slab corruption in safe mode. The fix ensures the bulk-out buffer size is at least eight bytes to prevent this condition.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in the Linux kernel affects the USB serial safe_serial driver. It arises from improper handling of small endpoint sizes, where the bulk-out buffer size was not validated to be at least eight bytes. This could lead to memory corruption controlled by a malicious USB device. The vulnerability has been addressed by enforcing a minimum buffer size requirement to avoid slab corruption in safe mode.
Potential Impact
The vulnerability could allow a malicious USB device to cause memory corruption within the kernel's USB serial driver. This may lead to system instability or potential escalation of privileges if exploited. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel by ensuring the bulk-out buffer size is at least eight bytes. Users should apply the official kernel updates that include this patch once available. Patch status is not yet confirmed in the provided data — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-6392-wc5j-gpp8
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63957"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ab2a4a8d598912eee4
Added to database: 07/19/2026, 19:38:19 UTC
Last enriched: 07/19/2026, 20:06:18 UTC
Last updated: 07/20/2026, 17:51:20 UTC
Views: 12
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