Bug 2492787 (CVE-2026-53195)

Summary: CVE-2026-53195 kernel: USB: serial: io_ti: fix heap overflow in build_i2c_fw_hdr()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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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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A flaw was found in the `USB: serial: io_ti` module of the Linux kernel. The `build_i2c_fw_hdr()` function allocates a fixed-size buffer but copies data into it without properly validating the input length from the firmware header. This oversight allows an attacker to provide a crafted firmware image, leading to a heap overflow. A successful exploit could result in arbitrary code execution or a denial of service (DoS) on the affected system.
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Description OSIDB Bzimport 2026-06-25 10:05:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

USB: serial: io_ti: fix heap overflow in build_i2c_fw_hdr()

build_i2c_fw_hdr() allocates a fixed-size buffer of
(16*1024 - 512) + sizeof(struct ti_i2c_firmware_rec) bytes, then
copies le16_to_cpu(img_header->Length) bytes into it without
validating that Length fits within the available space after the
firmware record header.

img_header->Length is a __le16 from the firmware file and can be
up to 65535. check_fw_sanity() validates the total firmware size
but not img_header->Length specifically.

Fix by rejecting images where img_header->Length exceeds the
available destination space.
Comment 1 Keith Grant 2026-06-26 00:22:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062559-CVE-2026-53195-5300@gregkh/T