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

2024-05-3015:29:22

Linux

github.com

linux kernel

vulnerability resolved

s390/cio

buffer

memdup_user_nul

oob read

scanf

AI Score

6.9

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

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"
      }
    ]
  }
]