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

CVE-2019-11478

2019-06-1700:00:00
ubuntu.com
ubuntu.com
24

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.966

Percentile

99.6%

JSON

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.

Bugs

Notes

Author Note
tyhicks This vulnerability results in exhausted CPU resources on kernels < 4.15 This vulnerability results in exhausted kernel memory on kernels >= 4.15
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-52.56UNKNOWN
ubuntu18.10noarchlinux< 4.18.0-22.23UNKNOWN
ubuntu19.04noarchlinux< 5.0.0-17.18UNKNOWN
ubuntu14.04noarchlinux< 3.13.0-171.222UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-151.178UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1041.43UNKNOWN
ubuntu18.10noarchlinux-aws< 4.18.0-1018.20UNKNOWN
ubuntu19.04noarchlinux-aws< 5.0.0-1008.8UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1046.50UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1085.96UNKNOWN
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CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

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Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.966

Percentile

99.6%

JSON
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