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cvelistCanonicalCVELIST:CVE-2019-11478
HistoryJun 17, 2019 - 12:00 a.m.

CVE-2019-11478 SACK can cause extensive memory use via fragmented resend queue

2019-06-1700:00:00
CWE-770
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

0.966 High

EPSS

Percentile

99.6%

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 commit f070ef2ac66716357066b683fb0baf55f8191a2e.

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"
      }
    ]
  }
]

References

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

0.966 High

EPSS

Percentile

99.6%