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Fencer Intel
high 7.5

CVE-2019-18680 json

An issue was discovered in the Linux kernel 4.4.x before 4.4.195.

published 7y ago modified 4mo ago also EUVD-2019-8396

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

An issue was discovered in the Linux kernel 4.4.x before 4.4.195. There is a NULL pointer dereference in rds_tcp_kill_sock() in net/rds/tcp.c that will cause denial of service, aka CID-91573ae4aed0.

Patch / fix

  • linux linux_kernel 4.4.195
  • linux Ubuntu 16.04 LTS 4.4.0-168.197
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1098.109
  • linux-kvm Ubuntu 16.04 LTS 4.4.0-1062.69
  • linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1125.134
  • linux-snapdragon Ubuntu 16.04 LTS 4.4.0-1129.137
  • linux-aws Ubuntu Pro 14.04 LTS 4.4.0-1058.62
  • linux-fips Ubuntu Pro FIPS-updates 16.04 LTS 4.4.0-1025.30
  • linux-lts-xenial Ubuntu Pro 14.04 LTS 4.4.0-168.197~14.04.1

ubuntu advisories UBUNTU-CVE-2019-18680

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-syms SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.113.1
  • kernel-source SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.113.1
  • kernel-default SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +5 more 4.4.180-94.113.1
  • kgraft-patch-SLE12-SP3_Update_30 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, OpenStack Cloud Crowbar 8 +3 more 1-4.5.1
  • kernel-syms SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.125.1
  • kernel-source SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.125.1
  • kernel-default SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.121-92.125.1
  • kgraft-patch-SLE12-SP2_Update_33 SLES for SAP 12 SP2, SLES 12 SP2-LTSS, OpenStack Cloud 7 1-3.5.1

suse advisories SUSE-SU-2020:2497-1SUSE-SU-2020:2491-1SUSE-SU-2019:3379-1SUSE-SU-2019:2984-1

Is CVE-2019-18680 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-18680 updated cvss 7.5

kernel: NULL pointer dereference in rds_tcp_kill_sock() in net/rds/tcp.c

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.64% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • cdn.kernel.org https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.195 referenced PoC, tagged "exploit" by a source, unverified
  • lkml.org https://lkml.org/lkml/2019/9/18/337 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.