CVE-2026-98204

Description

In the Linux kernel, the following vulnerability has been resolved: Input: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block() When chunking writes into SMBus blocks in rmi_smb_write_block(), the loop calculates block_len using the original total length (len) instead of the remaining length (cur_len). If len is greater than 32 bytes (SMB_MAX_COUNT), block_len remains 32 for every iteration, even on the final partial chunk where fewer than 32 bytes remain. This causes smb_block_write() to read 32 bytes from the advanced data buffer pointer, reading past the end of the input buffer. Fix this by calculating block_len using cur_len and advancing the buffer and address pointers by block_len.

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EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/29fbcf5834f0a7f74bfd017c07da2411b35a4e2a https://git.kernel.org/stable/c/50dd585bee7669eb165e5defcc35d17f3822cfbb https://git.kernel.org/stable/c/51cfe54f815ae175c7d1126b983d4d7c89715004 https://git.kernel.org/stable/c/7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8 https://git.kernel.org/stable/c/9f0ce5e162eed8b68345abe839c59768bc60f99a https://git.kernel.org/stable/c/d01337c0892d1509500c727edf81380777c2dd0f https://git.kernel.org/stable/c/dc05ec97b8299e48e31367a9bc412c7e9c0e2b42 https://git.kernel.org/stable/c/e022538e13dd1c82af5ec25ac28f12ca0ab26160

Frequently Asked Questions

What is CVE-2026-98204? +

In the Linux kernel, the following vulnerability has been resolved: Input: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block() When chunking writes into SMBus blocks in rmi_smb_write_block(), the loop calculates block_len using the original total length (len) instead of the remaining length (cur_len). If len is greater than 32 bytes (SMB_MAX_COUNT), block_len remains 32 for every iteration, even on the final partial chunk where fewer than 32 bytes remain. This causes smb_block_write() to read 32 bytes from the advanced data buffer pointer, reading past the end of the input buffer. Fix this by calculating block_len using cur_len and advancing the buffer and address pointers by block_len.

How do I check if I'm vulnerable to CVE-2026-98204? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.