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CVE-2019-11478

Publication date 17 June 2019

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

From the Ubuntu Security Team

Jonathan Looney discovered that the TCP retransmission queue implementation 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.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 19.04 disco
Fixed 5.0.0-17.18
18.10 cosmic
Fixed 4.18.0-22.23
18.04 LTS bionic
Fixed 4.15.0-52.56
16.04 LTS xenial
Fixed 4.4.0-151.178
14.04 LTS trusty
linux-aws 19.04 disco
Fixed 5.0.0-1008.8
18.10 cosmic
Fixed 4.18.0-1018.20
18.04 LTS bionic
Fixed 4.15.0-1041.43
16.04 LTS xenial
Fixed 4.4.0-1085.96
14.04 LTS trusty
linux-aws-hwe 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial
Fixed 4.15.0-1041.43~16.04.1
14.04 LTS trusty Not in release
linux-azure 19.04 disco
Fixed 5.0.0-1008.8
18.10 cosmic
Fixed 4.18.0-1020.20
18.04 LTS bionic
Fixed 4.18.0-1020.20~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1047.51
14.04 LTS trusty
linux-azure-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-1020.20~18.04.1
16.04 LTS xenial
Fixed 4.15.0-1047.51
14.04 LTS trusty Not in release
linux-euclid 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gcp 19.04 disco
Fixed 5.0.0-1008.8
18.10 cosmic
Fixed 4.18.0-1013.14
18.04 LTS bionic
Fixed 4.15.0-1034.36
16.04 LTS xenial
Fixed 4.15.0-1034.36~16.04.1
14.04 LTS trusty Not in release
linux-gcp-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-1013.14~18.04.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gke-4.15 19.04 disco Not in release
18.04 LTS bionic
Fixed 4.15.0-1034.36
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-gke-5.0 19.04 disco Not in release
18.04 LTS bionic
Not affected
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-goldfish 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-grouper 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.18.0-22.23~18.04.1
16.04 LTS xenial
Fixed 4.15.0-52.56~16.04.1
14.04 LTS trusty Not in release
linux-hwe-edge 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 5.0.0-17.18~18.04.1
16.04 LTS xenial
Fixed 4.15.0-52.56~16.04.1
14.04 LTS trusty Not in release
linux-kvm 19.04 disco
Fixed 5.0.0-1008.8
18.10 cosmic
Fixed 4.18.0-1014.14
18.04 LTS bionic
Fixed 4.15.0-1036.36
16.04 LTS xenial
Fixed 4.4.0-1048.55
14.04 LTS trusty Not in release
linux-lts-trusty 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-utopic 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-vivid 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-wily 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-xenial 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
linux-maguro 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-mako 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-manta 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oem 19.04 disco
Fixed 4.15.0-1043.48
18.10 cosmic
Fixed 4.15.0-1043.48
18.04 LTS bionic
Fixed 4.15.0-1043.48
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-oracle 19.04 disco
Fixed 4.15.0-1015.17
18.10 cosmic
Fixed 4.15.0-1015.17
18.04 LTS bionic
Fixed 4.15.0-1015.17
16.04 LTS xenial
Fixed 4.15.0-1015.17~16.04.1
14.04 LTS trusty Not in release
linux-raspi2 19.04 disco
Fixed 5.0.0-1010.10
18.10 cosmic
Fixed 4.18.0-1016.18
18.04 LTS bionic
Fixed 4.15.0-1038.40
16.04 LTS xenial
Fixed 4.4.0-1111.120
14.04 LTS trusty Not in release
linux-snapdragon 19.04 disco
Fixed 5.0.0-1014.14
18.10 cosmic Not in release
18.04 LTS bionic
Fixed 4.15.0-1055.59
16.04 LTS xenial
Fixed 4.4.0-1115.121
14.04 LTS trusty Not in release

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Notes

tyhicks

This vulnerability results in exhausted CPU resources on kernels < 4.15 This vulnerability results in exhausted kernel memory on kernels >= 4.15

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-4017-1
    • Linux kernel vulnerabilities
    • 17 June 2019
    • USN-4017-2
    • Linux kernel vulnerabilities
    • 17 June 2019

Other references