What’s Vulnerable › Vulnerabilities

CVE-2026-98204: Input: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block()

• 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: 2026-10-06 · updated 2026-10-19

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.

Affected products

• Linux kernel: 4.10 — 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/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

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