CVE-2019-11477

critical-risk
Published 2019-06-19

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 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 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.

Do I need to act?

!
74.3% chance of exploitation in next 30 days
EPSS score — higher than 26% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Redhat Linux F5 Canonical Pulsesecure Ivanti

References (58)

Third Party Advisory http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LS...
Third Party Advisory http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LS...
Third Party Advisory http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt
Third Party Advisory http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-...
Mailing List http://www.openwall.com/lists/oss-security/2019/06/20/3
Mailing List http://www.openwall.com/lists/oss-security/2019/06/28/2
Mailing List http://www.openwall.com/lists/oss-security/2019/07/06/3
Mailing List http://www.openwall.com/lists/oss-security/2019/07/06/4
Mailing List http://www.openwall.com/lists/oss-security/2019/10/24/1
Mailing List http://www.openwall.com/lists/oss-security/2019/10/29/3
Third Party Advisory http://www.vmware.com/security/advisories/VMSA-2019-0010.html
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1594
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1602
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1699
Third Party Advisory https://access.redhat.com/security/vulnerabilities/tcpsack
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=3b4929f...
Patch https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party...
Third Party Advisory https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
Third Party Advisory https://kc.mcafee.com/corporate/index?page=content&id=SB10287
and 38 more references
70
/ 100
critical-risk
Severity 26/34 · High
Exploitability 19/34 · Moderate
Exposure 25/34 · High