CVE-2024-36931 s390/cio: Ensure the copied buf is NUL terminated

2024-05-3015:29:22

Linux

www.cve.org

linux kernel

vulnerability resolved

s390/cio

buffer allocation

oob read

memdup_user_nul

AI Score

6.4

Confidence

Low

EPSS

Percentile

15.5%

JSON

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

s390/cio: Ensure the copied buf is NUL terminated

Currently, we allocate a lbuf-sized kernel buffer and copy lbuf from
userspace to that buffer. Later, we use scanf on this buffer but we don’t
ensure that the string is terminated inside the buffer, this can lead to
OOB read when using scanf. Fix this issue by using memdup_user_nul instead.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/s390/cio/cio_inject.c"
    ],
    "versions": [
      {
        "version": "a4f17cc72671",
        "lessThan": "c9d48ce16330",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a4f17cc72671",
        "lessThan": "10452edd175f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a4f17cc72671",
        "lessThan": "84b38f488366",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a4f17cc72671",
        "lessThan": "06759ebaf75c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a4f17cc72671",
        "lessThan": "da7c622cddd4",
        "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/s390/cio/cio_inject.c"
    ],
    "versions": [
      {
        "version": "5.13",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.13",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.159",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.91",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.31",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.10",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]