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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98207

mmc: spi: reset bytes_xfered before retrying CRC failures

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < 7d2f0ec16b300645f20435a6c3827b15e01419afaffected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < d1acf4b9f6e9697406ce84ee9acfb92e094d5c7aaffected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < 0b8c8504593409954ed1a60db4e437d814e04023affected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < da4929ee78ee701c3717543840798fedff66c430affected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < 57f5e29db63f7c80f1805d89234a74dcdbf60231affected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < 4885e587f1afa9e1a573ab66f8c4d94d7b836d86affected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < 3ae80c1fb7de4d3331427a955a44807745ac5a33affected
  • 061c6c847eeb11743e489a16e907b41c6f9042b6 to < 8b0cc8707f65e0f51912e764e1b309b2559db1ecaffected

Linux Linux

Default version status: affected

  • 2.6.37affected
  • 0 to < 2.6.37unaffected
  • 5.10.271 to ≤ 5.10.*unaffected
  • 5.15.222 to ≤ 5.15.*unaffected
  • 6.1.189 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.54 to ≤ 6.18.*unaffected
  • 7.2.8 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References