CVE-2024-36477 tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer

2024-06-2111:18:46

Linux

www.cve.org

linux kernel

vulnerability

tpm_tis_spi

spi header

tpm

buffer

out-of-bounds

kasan

transfer mechanism

0.0004 Low

EPSS

Percentile

5.1%

JSON

In the Linux kernel, the following vulnerability has been resolved:

tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer

The TPM SPI transfer mechanism uses MAX_SPI_FRAMESIZE for computing the
maximum transfer length and the size of the transfer buffer. As such, it
does not account for the 4 bytes of header that prepends the SPI data
frame. This can result in out-of-bounds accesses and was confirmed with
KASAN.

Introduce SPI_HDRSIZE to account for the header and use to allocate the
transfer buffer.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/char/tpm/tpm_tis_spi_main.c"
    ],
    "versions": [
      {
        "version": "a86a42ac2bd6",
        "lessThan": "1547183852dc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a86a42ac2bd6",
        "lessThan": "de13c56f9947",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a86a42ac2bd6",
        "lessThan": "195aba96b854",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/char/tpm/tpm_tis_spi_main.c"
    ],
    "versions": [
      {
        "version": "6.6",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.6",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.33",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.4",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc2",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]