Bug 2502371 (CVE-2026-63957)

Summary: CVE-2026-63957 kernel: USB: serial: safe_serial: fix memory corruption with small endpoint
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel. A malicious Universal Serial Bus (USB) device can exploit a vulnerability in the `safe_serial` driver by reporting a bulk-out buffer size smaller than eight bytes. This can lead to user-controlled slab corruption, a form of memory corruption, when the driver operates in 'safe' mode.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-07-19 16:04:30 UTC
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.