What’s Vulnerable › Vulnerabilities

CVE-2026-89878: media: s2255: check firmware size before reading trailing marker

• Severity: unknown
• 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: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: media: s2255: check firmware size before reading trailing marker s2255_probe() reads a 4-byte marker and version from the last 8 bytes of the firmware blob (fw->data[fw_size - 8] and [fw_size - 4]). If the firmware file is shorter than 8 bytes, fw_size - 8 underflows and the access reads out of bounds. Validate the firmware size before indexing.

Affected products

• Linux kernel: 2.6.28 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/330f2936ab768c7215322a476f033143e8891d28
• https://git.kernel.org/stable/c/342632a4d8ba3fafc1556deee0b7a48dd7860336
• https://git.kernel.org/stable/c/3e03f1209c1c8a45a7bc559f4ecd79d9b33f706d
• https://git.kernel.org/stable/c/5626785b0e4665326e4d96736c106161da09b2f0
• https://git.kernel.org/stable/c/6f6a5b0b0a84c2de0e152f2841e57bc226db924f
• https://git.kernel.org/stable/c/7d221859ba45d7228d0138c9a3e55bd3bb31e14e
• https://git.kernel.org/stable/c/8eca0f85eeb0789be40e637bcf9a21c4265b6c6f
• https://git.kernel.org/stable/c/ffc27411ea60b8a09f1fea3d664b65210fdeb454

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