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Fencer Vulns
high 7.5

CVE-2019-10639 json

The Linux kernel 4.x (starting from 4.1) and 5.x before 5.0.8 allows Information Exposure (partial kernel address disclosure), leading to a…

published 2019-07-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-2443

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

The Linux kernel 4.x (starting from 4.1) and 5.x before 5.0.8 allows Information Exposure (partial kernel address disclosure), leading to a KASLR bypass. Specifically, it is possible to extract the KASLR kernel image offset using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). This key contains enough bits from a kernel address (of a static variable) so when the key is extracted (via enumeration), the offset of the kernel image is exposed. This attack can be carried out remotely, by the attacker forcing the target device to send UDP or ICMP (or certain other) traffic to attacker-controlled IP addresses. Forcing a server to send UDP traffic is trivial if the server is a DNS server. ICMP traffic is trivial if the server answers ICMP Echo requests (ping). For client targets, if the target visits the attacker's web page, then WebRTC or gQUIC can be used to force UDP traffic to attacker-controlled IP addresses. NOTE: this attack against KASLR became viable in 4.1 because IP ID generation was changed to have a dependency on an address associated with a network namespace.

Patch / fix

  • linux linux_kernel 5.0.8
  • linux Debian 14, Debian 13, Debian 12 4.19.37-1

debian advisories DEBIAN-CVE-2019-10639

  • linux Ubuntu 16.04 LTS 4.4.0-150.176
  • linux Ubuntu 18.04 LTS 4.15.0-60.67
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1084.94
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1047.49
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1041.43
  • linux-gcp Ubuntu 18.04 LTS 4.15.0-1042.45
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-60.67~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.0.0-23.24~18.04.1

ubuntu advisories UBUNTU-CVE-2019-10639

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 RHEL 7 3.10.0-1127.el7
  • perf RHEL 7 3.10.0-1127.el7
  • bpftool RHEL 7 3.10.0-1127.el7
  • python-perf RHEL 7 3.10.0-1127.el7
  • kernel-kdump RHEL 7 3.10.0-1127.el7
  • kernel-tools RHEL 7 3.10.0-1127.el7
  • kernel-tools-libs RHEL 7 3.10.0-1127.el7
  • kernel-bootwrapper RHEL 7 3.10.0-1127.el7

red hat advisories RHSA-2020:1016RHSA-2020:1567RHSA-2020:1769RHSA-2020:2522RHSA-2020:1070

  • kernel-rt SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-syms-rt SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-rt_debug SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-source-rt SLE Real Time 12 SP4 4.12.14-8.3.1
  • kernel-source-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.8.1

suse advisories SUSE-SU-2019:2450-1SUSE-SU-2019:2430-1SUSE-SU-2019:2069-1SUSE-SU-2019:1855-1SUSE-SU-2019:1854-1SUSE-SU-2019:1852-1

  • kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.10.1
  • kernel-syms openSUSE Leap 15.0 4.12.14-lp150.12.67.1

opensuse advisories openSUSE-SU-2019:1757-1openSUSE-SU-2019:1716-1

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-2019-10639 updated cvss 3.7

Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR

  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.el8, kernel-debuginfo-common-aarch64 4.18.0-193.el8, kernel-debuginfo-common-ppc64le 4.18.0-193.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.el8, kernel 4.18.0-193.el8, bpftool 4.18.0-193.el8, kernel-core 4.18.0-193.el8, kernel-tools 4.18.0-193.el8, python3-perf 4.18.0-193.el8, +15 more
    fixed: vendor fix RHSA-2020:1769
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, kernel-tools-libs 3.10.0-1127.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1127.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, kernel-tools-libs 3.10.0-1127.el7, +2 more
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) perf 3.10.0-1062.26.1.el7, kernel 3.10.0-1062.26.1.el7, bpftool 3.10.0-1062.26.1.el7, python-perf 3.10.0-1062.26.1.el7, kernel-tools 3.10.0-1062.26.1.el7, kernel-tools-libs 3.10.0-1062.26.1.el7, +2 more
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1127.el7
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.26.1.el7
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1127.rt56.1093.el7, kernel-rt-trace 3.10.0-1127.rt56.1093.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1127.rt56.1093.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1127.rt56.1093.el7, kernel-rt-kvm 3.10.0-1127.rt56.1093.el7, kernel-rt-trace 3.10.0-1127.rt56.1093.el7, kernel-rt-debug-kvm 3.10.0-1127.rt56.1093.el7, kernel-rt-trace-kvm 3.10.0-1127.rt56.1093.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1127.rt56.1093.el7
    fixed: vendor fix RHSA-2020:1070
show 7 more
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-193.rt13.51.el8, kernel-rt-core 4.18.0-193.rt13.51.el8, kernel-rt-modules 4.18.0-193.rt13.51.el8, kernel-rt-debug-core 4.18.0-193.rt13.51.el8, kernel-rt-debug-modules 4.18.0-193.rt13.51.el8, kernel-rt-modules-extra 4.18.0-193.rt13.51.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-193.rt13.51.el8, kernel-rt-kvm 4.18.0-193.rt13.51.el8, kernel-rt-core 4.18.0-193.rt13.51.el8, kernel-rt-modules 4.18.0-193.rt13.51.el8, kernel-rt-debug-kvm 4.18.0-193.rt13.51.el8, kernel-rt-debug-core 4.18.0-193.rt13.51.el8, +4 more
    fixed: vendor fix RHSA-2020:1567
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-kdump 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, +7 more
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux Server EUS (v. 7.7) perf 3.10.0-1062.26.1.el7, kernel 3.10.0-1062.26.1.el7, bpftool 3.10.0-1062.26.1.el7, python-perf 3.10.0-1062.26.1.el7, kernel-kdump 3.10.0-1062.26.1.el7, kernel-tools 3.10.0-1062.26.1.el7, +7 more
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1127.el7, kernel-debuginfo-common-x86_64 3.10.0-1127.el7, kernel-debuginfo-common-ppc64le 3.10.0-1127.el7
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) kernel-debuginfo-common-ppc64 3.10.0-1062.26.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1062.26.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.26.1.el7
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, kernel-tools-libs 3.10.0-1127.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1127.el7
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    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

3.16% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-326 Inadequate Encryption Strength
Technology feeds

References

Sources

Fencer Vulns 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.