critical
CVE-2019-18805
kernel: integer overflow in tcp_ack_update_rtt in net/ipv4/tcp_input.c
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat7.3CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, Photon OS. Rated lower by Oracle (high), Red Hat (medium), Ubuntu (low).
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.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| Photon OS 1.0 | linux, linux-esx | 4.4.180-2.ph1 |
| Photon OS 2.0 | linux, linux-aws, linux-esx and 1 more | 4.9.173-2.ph2 |
| Photon OS 3.0 | linux, linux-aws, linux-esx and 1 more | 4.19.40-2.ph3 |
| debian 10 | linux | 4.19.67-1 |
| debian 11 | linux | 5.2.6-1 |
| debian 12 | linux | 5.2.6-1 |
| debian 13 | linux | 5.2.6-1 |
| debian 14 | linux | 5.2.6-1 |
| debian 9 | linux | 4.9.184-1 |
| echo | linux | 5.2.6-1 |
| Oracle Linux 8 | bpftool, kernel, kernel-abi-whitelists and 17 more | 4.18.0-193.el8 |
| root.io debian 11 | rootio-linux | 5.2.6-1 |
Show all 86 entries from 21 sources
| Source | Package | Fixed in |
|---|---|---|
| Photon OS 1.0 | linux | 4.4.180-2.ph1 |
| Photon OS 1.0 | linux-esx | 4.4.180-2.ph1 |
| Photon OS 2.0 | linux | 4.9.173-2.ph2 |
| Photon OS 2.0 | linux-aws | 4.9.173-2.ph2 |
| Photon OS 2.0 | linux-esx | 4.9.173-2.ph2 |
| Photon OS 2.0 | linux-secure | 4.9.173-2.ph2 |
| Photon OS 3.0 | linux | 4.19.40-2.ph3 |
| Photon OS 3.0 | linux-aws | 4.19.40-2.ph3 |
| Photon OS 3.0 | linux-esx | 4.19.40-2.ph3 |
| Photon OS 3.0 | linux-secure | 4.19.40-2.ph3 |
| debian 10 | linux | 4.19.67-1 |
| debian 11 | linux | 5.2.6-1 |
| debian 12 | linux | 5.2.6-1 |
| debian 13 | linux | 5.2.6-1 |
| debian 14 | linux | 5.2.6-1 |
| debian 9 | linux | 4.9.184-1 |
| echo | linux | 5.2.6-1 |
| Oracle Linux 8 | bpftool | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-abi-whitelists | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-core | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-cross-headers | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-debug | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-debug-core | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-debug-devel | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-debug-modules | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-debug-modules-extra | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-devel | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-doc | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-headers | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-modules | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-modules-extra | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-tools | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-tools-libs | 4.18.0-193.el8 |
| Oracle Linux 8 | kernel-tools-libs-devel | 4.18.0-193.el8 |
| Oracle Linux 8 | perf | 4.18.0-193.el8 |
| Oracle Linux 8 | python3-perf | 4.18.0-193.el8 |
| root.io debian 11 | rootio-linux | 5.2.6-1 |
| root.io debian 12 | rootio-linux | 5.2.6-1 |
| root.io debian 13 | rootio-linux | 5.2.6-1 |
| ubuntu 14.04-ESM | linux-aws | 4.4.0-1054.58 |
| ubuntu 14.04-ESM | linux-azure | 4.15.0-1059.64~14.04.1 |
| ubuntu 14.04-ESM | linux-lts-xenial | 4.4.0-164.192~14.04.1 |
| ubuntu 16.04 | linux | 4.4.0-157.185 |
| ubuntu 16.04 | linux-aws | 4.4.0-1090.101 |
| ubuntu 16.04 | linux-aws-hwe | 4.15.0-1047.49~16.04.1 |
| ubuntu 16.04 | linux-azure | 4.15.0-1056.61 |
| ubuntu 16.04 | linux-gcp | 4.15.0-1041.43 |
| ubuntu 16.04 | linux-hwe | 4.15.0-60.67~16.04.1 |
| ubuntu 16.04 | linux-kvm | 4.4.0-1052.59 |
| ubuntu 16.04 | linux-oracle | 4.15.0-1022.25~16.04.1 |
| ubuntu 16.04 | linux-raspi2 | 4.4.0-1117.126 |
| ubuntu 16.04 | linux-snapdragon | 4.4.0-1121.127 |
| ubuntu 16.04-ESM | linux | 4.4.0-157.185 |
| ubuntu 16.04-ESM | linux-aws | 4.4.0-1090.101 |
| ubuntu 16.04-ESM | linux-aws-hwe | 4.15.0-1047.49~16.04.1 |
| ubuntu 16.04-ESM | linux-azure | 4.15.0-1056.61 |
| ubuntu 16.04-ESM | linux-gcp | 4.15.0-1041.43 |
| ubuntu 16.04-ESM | linux-hwe | 4.15.0-60.67~16.04.1 |
| ubuntu 16.04-ESM | linux-kvm | 4.4.0-1052.59 |
| ubuntu 16.04-ESM | linux-oracle | 4.15.0-1022.25~16.04.1 |
| ubuntu 18.04 | linux | 4.15.0-60.67 |
| ubuntu 18.04 | linux-aws | 4.15.0-1047.49 |
| ubuntu 18.04 | linux-azure | 5.0.0-1014.14~18.04.1 |
| ubuntu 18.04 | linux-gcp | 4.15.0-1042.45 |
| ubuntu 18.04 | linux-gke-4.15 | 4.15.0-1041.43 |
| ubuntu 18.04 | linux-hwe | 5.0.0-23.24~18.04.1 |
| ubuntu 18.04 | linux-kvm | 4.15.0-1043.43 |
| ubuntu 18.04 | linux-oem | 4.15.0-1056.65 |
| ubuntu 18.04 | linux-oem-osp1 | 5.0.0-1015.16 |
| ubuntu 18.04 | linux-oracle | 4.15.0-1022.25 |
| ubuntu 18.04 | linux-raspi2 | 4.15.0-1044.47 |
| ubuntu 18.04 | linux-snapdragon | 4.15.0-1062.69 |
| ubuntu 18.04-ESM | linux | 4.15.0-60.67 |
| ubuntu 18.04-ESM | linux-aws | 4.15.0-1047.49 |
| ubuntu 18.04-ESM | linux-azure | 5.0.0-1014.14~18.04.1 |
| ubuntu 18.04-ESM | linux-gcp | 4.15.0-1042.45 |
| ubuntu 18.04-ESM | linux-gke-4.15 | 4.15.0-1041.43 |
| ubuntu 18.04-ESM | linux-hwe | 5.0.0-23.24~18.04.1 |
| ubuntu 18.04-ESM | linux-kvm | 4.15.0-1043.43 |
| ubuntu 18.04-ESM | linux-oem | 4.15.0-1056.65 |
| ubuntu 18.04-ESM | linux-oracle | 4.15.0-1022.25 |
| ubuntu 19.04 | linux | 5.0.0-21.22 |
| ubuntu 19.04 | linux-azure | 5.0.0-1012.12 |
| ubuntu 19.10 | linux-oem | 4.15.0-1059.68 |
| ubuntu 19.10 | linux-oem-osp1 | 5.0.0-1018.20 |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.html
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.html
- https://access.redhat.com/errata/RHSA-2020:0740
- https://access.redhat.com/security/cve/CVE-2019-18805
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78
- https://linux.oracle.com/cve/CVE-2019-18805.html
- https://linux.oracle.com/errata/ELSA-2020-1769.html