CVE-2024-42242 mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE

2024-08-0715:14:29

Linux

www.cve.org

linux kernel

vulnerability

cve-2024-42242

mmc

sdhci

maximum segment size.

EPSS

Percentile

9.5%

JSON

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

mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE

blk_queue_max_segment_size() ensured:

if (max_size &lt; PAGE_SIZE)
	max_size = PAGE_SIZE;

whereas:

blk_validate_limits() makes it an error:

if (WARN_ON_ONCE(lim-&gt;max_segment_size &lt; PAGE_SIZE))
	return -EINVAL;

The change from one to the other, exposed sdhci which was setting maximum
segment size too low in some circumstances.

Fix the maximum segment size when it is too low.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/mmc/host/sdhci.c"
    ],
    "versions": [
      {
        "version": "616f87661792",
        "lessThan": "bf78b1accef4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "616f87661792",
        "lessThan": "63d20a94f24f",
        "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/mmc/host/sdhci.c"
    ],
    "versions": [
      {
        "version": "6.9",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.9",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.10",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]