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Vulnerability record · CVE-2019-18805 · published 7 November 2019

CVE-2019-18805: Linux kernel integer overflow vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 3.4% · top 11.5% CWE-190 · Integer overflow
9.8CVSS 3.1 base score, v2 7.5
3.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

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

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.html Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2020:0740 Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11 Mailing ListPatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20191205-0001/ Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.html Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2020:0740 Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11 Mailing ListPatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20191205-0001/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-18805), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.