All vulnerabilities
CVE-2026-98207

Linux: mmc: spi: reset bytes_xfered before retrying CRC failures

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 in7d2f0ec16b300645f20435a6c3827b15e01419afAlso 0b8c8504593409954ed1a60db4e437d814e04023, 57f5e29db63f7c80f1805d89234a74dcdbf60231 and 3 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 7d2f0ec16b300645f20435a6c3827b15e01419afLinuxCVE List
  • 0b8c8504593409954ed1a60db4e437d814e04023LinuxCVE List
  • 57f5e29db63f7c80f1805d89234a74dcdbf60231LinuxCVE List
  • 4885e587f1afa9e1a573ab66f8c4d94d7b836d86LinuxCVE List
  • 3ae80c1fb7de4d3331427a955a44807745ac5a33LinuxCVE List
  • 8b0cc8707f65e0f51912e764e1b309b2559db1ecLinuxCVE 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:

mmc: spi: reset bytes_xfered before retrying CRC failures

mmc_spi_data_do() updates data->bytes_xfered after each block has been transferred successfully. If a later block in the same data request fails with a CRC error, data->bytes_xfered may therefore contain the number of bytes completed before the failing block.

mmc_spi_request() has a private recovery path for such CRC failures. It sends STOP_TRANSMISSION, clears data->error and jumps back to crc_recover to issue the same command and data request again. However, it does not clear data->bytes_xfered before the retry.

If the retry succeeds, the request is completed with the bytes from the failed attempt still included in data->bytes_xfered. For a multi-block request this can make the completed request report more bytes than were transferred by the successful retry, and can even exceed the request size when most blocks completed before the CRC error.

This is most likely to be observed on MMC-over-SPI systems where long multi-block transfers occasionally hit a data CRC error but the mmc_spi-internal retry succeeds. The data itself is retried, but the completion accounting is not.

Clear data->bytes_xfered together with data->error before repeating the request so the final completion reports only the bytes transferred by the successful attempt.

Text from CVE List

Affected versions 18

  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before 7d2f0ec16b300645f20435a6c3827b15e01419afCVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before d1acf4b9f6e9697406ce84ee9acfb92e094d5c7aCVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before 0b8c8504593409954ed1a60db4e437d814e04023CVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before da4929ee78ee701c3717543840798fedff66c430CVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before 57f5e29db63f7c80f1805d89234a74dcdbf60231CVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before 4885e587f1afa9e1a573ab66f8c4d94d7b836d86CVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before 3ae80c1fb7de4d3331427a955a44807745ac5a33CVE List
  • Linuxaffected: 061c6c847eeb11743e489a16e907b41c6f9042b6 before 8b0cc8707f65e0f51912e764e1b309b2559db1ecCVE List
  • Linuxaffected: 2.6.37CVE List
  • Linuxunaffected: all versions before 2.6.37CVE 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