CVE-2024-36957 octeontx2-af: avoid off-by-one read from userspace

2024-05-3015:35:50

Linux

github.com

linux kernel

vulnerability

off-by-one read

userspace

memdup_user

memdup_user_nul

nul terminated

cve-2024-36957

AI Score

6.9

Confidence

Low

EPSS

Percentile

10.3%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

octeontx2-af: avoid off-by-one read from userspace

We try to access count + 1 byte from userspace with memdup_user(buffer,
count + 1). However, the userspace only provides buffer of count bytes and
only these count bytes are verified to be okay to access. To ensure the
copied buffer is NUL terminated, we use memdup_user_nul instead.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "dae49384d0d7",
        "lessThan": "bcdac70adceb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a2eb515d136",
        "lessThan": "ec697fbd38cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a2eb515d136",
        "lessThan": "8f11fe3ea3fc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a2eb515d136",
        "lessThan": "0a0285cee11c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a2eb515d136",
        "lessThan": "fc3e0076c1f8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a2eb515d136",
        "lessThan": "f299ee709fb4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.12",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.10.217",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.159",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.91",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.31",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.10",
        "versionType": "custom",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c"
    ],
    "defaultStatus": "affected"
  }
]