CVE-2019-18805

high-risk
Published 2019-11-07

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.

Do I need to act?

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0.57% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Redhat Linux Broadcom Netapp Opensuse

References (12)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.html
Third Party Advisory https://access.redhat.com/errata/RHSA-2020:0740
Mailing List https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19...
Third Party Advisory https://security.netapp.com/advisory/ntap-20191205-0001/
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.html
Third Party Advisory https://access.redhat.com/errata/RHSA-2020:0740
Mailing List https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19...
Third Party Advisory https://security.netapp.com/advisory/ntap-20191205-0001/
55
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 2/34 · Minimal
Exposure 21/34 · High