CVE-2020-16166
published 2020-07-30CVE-2020-16166: The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network…
PriorityP422low3.7CVSS 3.1
AVNACHPRNUINSUCLINAN
EPSS
5.27%
91.6th percentile
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.
Affected
24 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | debian_linux | — | — |
| debian | linux | < linux 5.7.17-1 (bookworm) | linux 5.7.17-1 (bookworm) |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| linux | linux_kernel | <= 5.7.11 | — |
| linux | linux_kernel | >= 0 < 5.7.17-1 | 5.7.17-1 |
| linux | linux_kernel | >= 0 < 5.7.17-1 | 5.7.17-1 |
| linux | linux_kernel | >= 0 < 5.7.17-1 | 5.7.17-1 |
| linux | linux_kernel | >= 0 < 5.7.17-1 | 5.7.17-1 |
| linux | linux_kernel | >= 0 < 4.15.0-118.119 | 4.15.0-118.119 |
| linux | linux_kernel | >= 0 < 5.4.0-48.52 | 5.4.0-48.52 |
| msrc | cbl_mariner_1.0_arm | — | — |
| msrc | cbl_mariner_1.0_x64 | — | — |
| msrc | cm1_kernel_5.4.91-3_on_cbl_mariner_1.0 | — | — |
| netapp | active_iq_unified_manager | >= 9.5 | — |
| netapp | e-series_santricity_os_controller | 11.0.0 – 11.60.3 | — |
| netapp | storagegrid | <= 9.0.4 | — |
| opensuse | leap | — | — |
| opensuse | leap | — | — |
| oracle | sd-wan_edge | — | — |
CVSS provenance
nvdv3.13.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:P/I:N/A:N
osv5.5MEDIUM
vendor_ubuntu5.5MEDIUM
vendor_debian3.7LOW
vendor_msrc3.7LOW
vendor_redhat3.7LOW
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GHSA
GHSA-6c68-84gq-j9gr: The Linux kernel through 5
ghsa_unreviewed·2022-05-24
CVE-2020-16166 [MEDIUM] CWE-200 GHSA-6c68-84gq-j9gr: The Linux kernel through 5
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.
OSV
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
osv·2020-09-24·CVSS 5.5
CVE-2019-18808 [MEDIUM] linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)
It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)
It was discovered that the VFIO PCI driver in the Linux kernel did not
properly handle attempts to access disabled
OSV
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
osv·2020-09-23·CVSS 5.5
CVE-2019-18808 [MEDIUM] linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)
It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)
It was discovered that the ADIS16400 IIO IMU Driver for the Linux kernel
did not properly deallocate memor
OSV
CVE-2020-16166: The Linux kernel through 5
osv·2020-07-30·CVSS 3.7
CVE-2020-16166 [LOW] CVE-2020-16166: The Linux kernel through 5
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2020-09-24·CVSS 5.5
CVE-2019-18808 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)
It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)
It was discovered that the VFIO PCI driver in the Linux kernel did not
properly handle attempts to access disabled memory spaces. A local attacker
could use this to cause a denial of service (system crash)
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2020-09-23·CVSS 5.5
CVE-2019-18808 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)
It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)
It was discovered that the ADIS16400 IIO IMU Driver for the Linux kernel
did not properly deallocate memory in certain error conditions. A local
attacker could use this to cause a denial of service (memory
Red Hat
kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
vendor_redhat·2020-07-29·CVSS 3.7
CVE-2020-16166 [LOW] CWE-200 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.
A flaw was found in the Linux kernel. The generation of the device ID from the network RNG internal state is predictable. The highest threat from this vulnerability is to data confidentiality.
Mitigation: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Package: kernel (Red Hat Ent
Microsoft
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG aka CID-f227e3ec3b5c. This is related
vendor_msrc·2020-07-14·CVSS 3.7
CVE-2020-16166 [LOW] CWE-330 The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG aka CID-f227e3ec3b5c. This is related
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to add
Debian
CVE-2020-16166: linux - The Linux kernel through 5.7.11 allows remote attackers to make observations tha...
vendor_debian·2020·CVSS 3.7
CVE-2020-16166 [LOW] CVE-2020-16166: linux - The Linux kernel through 5.7.11 allows remote attackers to make observations tha...
The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.
Scope: local
bookworm: resolved (fixed in 5.7.17-1)
bullseye: resolved (fixed in 5.7.17-1)
forky: resolved (fixed in 5.7.17-1)
sid: resolved (fixed in 5.7.17-1)
trixie: resolved (fixed in 5.7.17-1)
No detection rules found.
No public exploits indexed.
arXiv
Cross Layer Attacks and How to Use Them (for DNS Cache Poisoning, Device Tracking and More)
arxiv_fulltext·2020-12-14
Cross Layer Attacks and How to Use Them (for DNS Cache Poisoning, Device Tracking and More)
Cross Layer Attacks and How to Use Them (for DNS Cache Poisoning, Device Tracking and More)
Amit Klein
Bar-Ilan University, Israel
[email protected]
## Abstract
We analyze the prandom pseudo random number generator (PRNG) in use in the Linux kernel (which is the kernel of the Linux operating system, as well as of Android) and demonstrate that this PRNG is weak. The prandom PRNG is in use by many ``consumers'' in the Linux kernel. We focused on three consumers at the network level -- the UDP source port generation algorithm, the IPv6 flow label generation algorithm and the IPv4 ID generation algorithm. The flawed prandom PRNG is shared by all these consumers, which enables us to mount ``cross layer attacks'' against the Linux kernel. In these attacks, we infer the internal state of t
Bugzilla
CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c [fedora-all]
bugzilla·2020-08-04·CVSS 3.7
CVE-2020-16166 [LOW] CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c [fedora-all]
CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects
Bugzilla
CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
bugzilla·2020-08-04·CVSS 3.7
CVE-2020-16166 [LOW] CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
A flaw was found in the way the Linux kernel derived the network RNG's internal state making the device ID predictable. Adding net_rand_state (randomness) on interrupt and CPU activity makes speculation complicated by a remote observer.
This modifies the first 32 bits out of the 128 bits of a random CPU's net_rand_state on interrupt or CPU activity to complicate remote observations that could lead to guessing the network RNG's internal state.
In addition, with NOHZ some CPUs might not even get timer interrupts, leaving their local state rarely updated, while they are running networked processes making use of the random state. For this reason, we also perform this update in update_process_times()
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00047.htmlhttps://arxiv.org/pdf/2012.07432.pdfhttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f227e3ec3b5cad859ad15666874405e8c1bbc1d4https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c51f8f88d705e06bd696d7510aff22b33eb8e638https://github.com/torvalds/linux/commit/f227e3ec3b5cad859ad15666874405e8c1bbc1d4https://lists.debian.org/debian-lts-announce/2020/09/msg00025.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAPTLPAEKVAJYJ4LHN7VH4CN2W75R2YW/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFBCLQWJI5I4G25TVJNLXLAXJ4MERQNW/https://security.netapp.com/advisory/ntap-20200814-0004/https://usn.ubuntu.com/4525-1/https://usn.ubuntu.com/4526-1/https://www.oracle.com/security-alerts/cpuApr2021.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00047.htmlhttps://arxiv.org/pdf/2012.07432.pdfhttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f227e3ec3b5cad859ad15666874405e8c1bbc1d4https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c51f8f88d705e06bd696d7510aff22b33eb8e638https://github.com/torvalds/linux/commit/f227e3ec3b5cad859ad15666874405e8c1bbc1d4https://lists.debian.org/debian-lts-announce/2020/09/msg00025.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAPTLPAEKVAJYJ4LHN7VH4CN2W75R2YW/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFBCLQWJI5I4G25TVJNLXLAXJ4MERQNW/https://security.netapp.com/advisory/ntap-20200814-0004/https://usn.ubuntu.com/4525-1/https://usn.ubuntu.com/4526-1/https://www.oracle.com/security-alerts/cpuApr2021.html
2020-07-30
Published