CVE-2022-48630 crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ

2024-03-0511:18:07

Linux

www.cve.org

linux kernel

qcom-rng

cryptography

vulnerability

infinite loop

qualcomm amberwing processor

word_sz

kcapi-rng

AI Score

7.5

Confidence

High

EPSS

Percentile

10.3%

JSON

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

crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ

The commit referenced in the Fixes tag removed the ‘break’ from the else
branch in qcom_rng_read(), causing an infinite loop whenever ‘max’ is
not a multiple of WORD_SZ. This can be reproduced e.g. by running:

kcapi-rng -b 67 &gt;/dev/null

There are many ways to fix this without adding back the ‘break’, but
they all seem more awkward than simply adding it back, so do just that.

Tested on a machine with Qualcomm Amberwing processor.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/crypto/qcom-rng.c"
    ],
    "versions": [
      {
        "version": "a8e32bbb96c2",
        "lessThan": "71a89789552b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "184f7bd08ce5",
        "lessThan": "8be06f62b426",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0f9b7b8df175",
        "lessThan": "233a3cc60e7a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ab9337c7cb6f",
        "lessThan": "8a06f25f5941",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a680b1832ced",
        "lessThan": "05d4d17475d8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a680b1832ced",
        "lessThan": "16287397ec5c",
        "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/crypto/qcom-rng.c"
    ],
    "versions": [
      {
        "version": "5.17",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.17",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.245",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.196",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.118",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.42",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.17.10",
        "lessThanOrEqual": "5.17.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.18",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]