CVE-2019-18805
CRITICALCVSS 9.8/10EPSS 3.43%
Last modified
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
Weakness Enumeration
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
- https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.htmlMailing List, Third Party Advisory
- https://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
- https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.htmlMailing List, Third Party Advisory
- https://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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-18805?
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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2019
- CVE-2019-18799LibSass before 3.6.3 allows a NULL pointer dereference in Sa…6.5
- CVE-2019-1880A vulnerability in the BIOS upgrade utility of Cisco Unified…4.4
- CVE-2019-18800Viber through 11.7.0.5 allows a remote attacker who can capt…8.8
- CVE-2019-18801An issue was discovered in Envoy 1.12.0. An untrusted remote…9.8
- CVE-2019-18802An issue was discovered in Envoy 1.12.0. An untrusted remote…9.8
- CVE-2019-18804DjVuLibre 3.5.27 has a NULL pointer dereference in the funct…7.5
- CVE-2019-18806A memory leak in the ql_alloc_large_buffers() function in dr…5.5
- CVE-2019-18807Two memory leaks in the sja1105_static_config_upload() funct…7.5
- CVE-2019-18808A memory leak in the ccp_run_sha_cmd() function in drivers/c…5.5
- CVE-2019-18809A memory leak in the af9005_identify_state() function in dri…4.6
- CVE-2019-1881A vulnerability in the web-based management interface of Cis…4.7
- CVE-2019-18810A memory leak in the komeda_wb_connector_add() function in d…7.5
Are you affected by CVE-2019-18805?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST