Red Hat Security Advisory: kernel security and bug fix update

Fixed packages 43

Vulnerabilities 4

• High 7.5
  CVE-2019-11477 Public exploit EPSS 99%

  Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs

  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. This has been fi…

  Linux linux_kernel linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jun 18, 2019
• Medium 5.3
  CVE-2019-11478 Public exploit EPSS 94%

  SACK can cause extensive memory use via fragmented resend queue

  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 serv…

  Linux linux_kernel linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jun 18, 2019
• Medium 5.3
  CVE-2019-11479 EPSS 91%

  Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fr…

  Linux linux_kernel linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jun 18, 2019
• Unscored —
  CVE-2019-9213 Public exploit

  In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which mak…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Mar 5, 2019

References

• article
  https://access.redhat.com/security/updates/classification/#important
• article
  https://access.redhat.com/security/vulnerabilities/tcpsack
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1686136
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1719123
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1719128
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1719129
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2019/rhsa-2019_1479.json
• report
  https://access.redhat.com/security/cve/CVE-2019-9213
• advisory
  https://www.cve.org/CVERecord?id=CVE-2019-9213
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2019-9213
• report
  https://access.redhat.com/security/cve/CVE-2019-11477
• advisory
  https://www.cve.org/CVERecord?id=CVE-2019-11477
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2019-11477
• article
  https://patchwork.ozlabs.org/project/netdev/list/?series=114310
• article
  https://www.openwall.com/lists/oss-security/2019/06/17/5
• report
  https://access.redhat.com/security/cve/CVE-2019-11478
• advisory
  https://www.cve.org/CVERecord?id=CVE-2019-11478
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2019-11478
• report
  https://access.redhat.com/security/cve/CVE-2019-11479
• advisory
  https://www.cve.org/CVERecord?id=CVE-2019-11479
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2019-11479