vulnerability
Red Hat OpenShift: CVE-2019-11479: kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:N/I:N/A:P) | Jun 19, 2019 | Dec 29, 2020 | Apr 11, 2025 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
Jun 19, 2019
Added
Dec 29, 2020
Modified
Apr 11, 2025
Description
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.
Solution
linuxrpm-upgrade-redhat-coreos
References
- CVE-2019-11479
- https://attackerkb.com/topics/CVE-2019-11479
- REDHAT-RHSA-2019:1479
- REDHAT-RHSA-2019:1480
- REDHAT-RHSA-2019:1481
- REDHAT-RHSA-2019:1482
- REDHAT-RHSA-2019:1483
- REDHAT-RHSA-2019:1484
- REDHAT-RHSA-2019:1485
- REDHAT-RHSA-2019:1486
- REDHAT-RHSA-2019:1487
- REDHAT-RHSA-2019:1488
- REDHAT-RHSA-2019:1489
- REDHAT-RHSA-2019:1490
- REDHAT-RHSA-2019:1594
- REDHAT-RHSA-2019:1602
- REDHAT-RHSA-2019:1699
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