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CVE-2023-54284: media: av7110: prevent underflow in write_ts_to_decoder()

• Severity: high (CVSS 7.1 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: 2025-12-30 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: media: av7110: prevent underflow in write_ts_to_decoder() The buf[4] value comes from the user via ts_play(). It is a value in the u8 range. The final length we pass to av7110_ipack_instant_repack() is "len - (buf[4] + 1) - 4" so add a check to ensure that the length is not negative. It's not clear that passing a negative len value does anything bad necessarily, but it's not best practice. With the new bounds checking the "if (!len)" condition is no longer possible or required so remove that.

Affected products

• Linux kernel: 2.6.31 — fixed in 6.4

How to fix

Upgrade to a fixed version: Linux kernel 6.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/423350af9e27f005611bd881b1df2cab66de943d
• https://git.kernel.org/stable/c/620b983589e0223876bf1463b01100a9c67b56ba
• https://git.kernel.org/stable/c/6606e2404ee9e20a3ae5b42fc3660d41b739ed3e
• https://git.kernel.org/stable/c/6680af5be9f08d830567e9118f76d3e64684db8f
• https://git.kernel.org/stable/c/77eeb4732135c18c2fdfab80839645b393f3e774
• https://git.kernel.org/stable/c/7b93ab60fe9ed04be0ff155bc30ad39dea23e22b
• https://git.kernel.org/stable/c/86ba65e5357bfbb6c082f68b265a292ee1bdde1d
• https://git.kernel.org/stable/c/ca4ce92e3ec9fd3c7c936b912b95c53331d5159c
• https://git.kernel.org/stable/c/eed9496a0501357aa326ddd6b71408189ed872eb

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