CVE-2019-11479

2019-06-1700:00:00

CWE-405

canonical

www.cve.org

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

7.3 High

AI Score

Confidence

High

0.974 High

EPSS

Percentile

99.9%

JSON

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

CNA Affected

[
  {
    "product": "Linux kernel",
    "vendor": "Linux",
    "versions": [
      {
        "lessThan": "4.4.182",
        "status": "affected",
        "version": "4.4",
        "versionType": "custom"
      },
      {
        "lessThan": "4.9.182",
        "status": "affected",
        "version": "4.9",
        "versionType": "custom"
      },
      {
        "lessThan": "4.14.127",
        "status": "affected",
        "version": "4.14",
        "versionType": "custom"
      },
      {
        "lessThan": "4.19.52",
        "status": "affected",
        "version": "4.19",
        "versionType": "custom"
      },
      {
        "lessThan": "5.1.11",
        "status": "affected",
        "version": "5.1",
        "versionType": "custom"
      }
    ]
  }
]