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CVE-2026-98204

Linux: Input: rmi_smbus - fix out-of-bounds read in rmi_smb_write_block()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8Also 29fbcf5834f0a7f74bfd017c07da2411b35a4e2a, 50dd585bee7669eb165e5defcc35d17f3822cfbb and 2 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8LinuxCVE List
  • 29fbcf5834f0a7f74bfd017c07da2411b35a4e2aLinuxCVE List
  • 50dd585bee7669eb165e5defcc35d17f3822cfbbLinuxCVE List
  • 9f0ce5e162eed8b68345abe839c59768bc60f99aLinuxCVE List
  • 51cfe54f815ae175c7d1126b983d4d7c89715004LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 18

  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before d01337c0892d1509500c727edf81380777c2dd0fCVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before 7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8CVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before 29fbcf5834f0a7f74bfd017c07da2411b35a4e2aCVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before 50dd585bee7669eb165e5defcc35d17f3822cfbbCVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before e022538e13dd1c82af5ec25ac28f12ca0ab26160CVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before dc05ec97b8299e48e31367a9bc412c7e9c0e2b42CVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before 9f0ce5e162eed8b68345abe839c59768bc60f99aCVE List
  • Linuxaffected: 82264d0cf7aef2247563c031ff2ab96579d5d0cc before 51cfe54f815ae175c7d1126b983d4d7c89715004CVE List
  • Linuxaffected: 4.10CVE List
  • Linuxunaffected: all versions before 4.10CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8