CVE-2021-47186 tipc: check for null after calling kmemdup

2024-04-1018:56:26

Linux

github.com

linux kernel

vulnerability

cve-2021-47186

kmemdup

null pointer check

tipc.

AI Score

6.8

Confidence

Low

SSVC

Exploitation

none

Automatable

yes

Technical Impact

partial

JSON

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

tipc: check for null after calling kmemdup

kmemdup can return a null pointer so need to check for it, otherwise
the null key will be dereferenced later in tipc_crypto_key_xmit as
can be seen in the trace [1].

[1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a58

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "1da177e4c3f4",
        "lessThan": "a7d91625863d",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "1da177e4c3f4",
        "lessThan": "9404c4145542",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "1da177e4c3f4",
        "lessThan": "3e6db079751a",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.10.82",
        "versionType": "custom",
        "lessThanOrEqual": "5.11"
      },
      {
        "status": "unaffected",
        "version": "5.15.5",
        "versionType": "custom",
        "lessThanOrEqual": "5.16"
      },
      {
        "status": "unaffected",
        "version": "5.16"
      }
    ],
    "defaultStatus": "unknown"
  }
]