Advisories ยป MGASA-2019-0195

Updated kernel packages fix security vulnerability

Publication date: 21 Jun 2019
Modification date: 17 Feb 2022
Type: security
Affected Mageia releases : 6
CVE: CVE-2019-5599 , CVE-2019-11477 , CVE-2019-11478 , CVE-2019-11479

Description

This kernel update is based on the upstream 4.14.127 and fixes at least
the following security issues:

Jonathan Looney discovered that it is possible to send a crafted sequence
of SACKs which will fragment the RACK send map. An attacker may be able to
further exploit the fragmented send map to cause an expensive linked-list
walk for subsequent SACKs received for that same TCP connection
(CVE-2019-5599).

Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value
was subject to an integer overflow in the Linux kernel when handling TCP
Selective Acknowledgments (SACKs). A remote attacker could use this to
cause a denial of service (CVE-2019-11477).

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 (CVE-2019-11478).

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 (CVE-2019-11479).

WireGuard has been updated to 0.0.20190601.

For other uptstream fixes in this update, see the referenced changelogs.

References

SRPMS

6/core