CVE-2019-18805

Name: CVE-2019-18805
Creator: NVD / NIST
Published: 2019-11-07T14:15:11.067+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.43%

Last modified Jun 17, 2026

CVE-2019-18805 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.. EPSS estimates a 3.43% chance of exploitation in the next 30 days.

Description

An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.43%

87.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	>= 4.4, < 4.4.180	—
Linux	Linux Kernel	>= 4.9, < 4.9.172	—
Linux	Linux Kernel	>= 4.14, < 4.14.115	—
Linux	Linux Kernel	>= 4.19, < 4.19.38	—
Linux	Linux Kernel	>= 5.0, < 5.0.11	—
Linux	Linux Kernel	5.1	Rc1
Opensuse	Leap	15.0	—
Opensuse	Leap	15.1	—
Redhat	Enterprise Linux	7.0	—
Netapp	Active Iq Unified Manager	All versions	—
Netapp	Data Availability Services	All versions	—
Netapp	E-Series Santricity Os Controller	>= 11.0.0, <= 11.60.3	—
Netapp	Hci Management Node	All versions	—
Netapp	Solidfire	All versions	—
Netapp	Steelstore Cloud Integrated Storage	All versions	—
Netapp	Hci Compute Node	All versions	—
Netapp	Hci Storage Node	All versions	—
Broadcom	Fabric Operating System	All versions	—
Netapp	Aff A700s Firmware	All versions	—
Netapp	Fas8300 Firmware	All versions	—
Netapp	Fas8700 Firmware	All versions	—
Netapp	Aff A400 Firmware	All versions	—
Netapp	H610s Firmware	All versions	—

References

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.htmlMailing List, Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0740Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11Mailing List, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78Mailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20191205-0001/Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.htmlMailing List, Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0740Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11Mailing List, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78Mailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20191205-0001/Third Party Advisory

Timeline

Published: Nov 7, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18805?

How severe is CVE-2019-18805?

CVE-2019-18805 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.43% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18805?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18805?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST