kernel: The flow_dissector feature allows device tracking
Published Jan 16, 2020
5.3
MEDIUMCVSS 3.1
EPSS 2.60%
Description
The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.
Affected products
No data.
Configuration 1
- ≥ 4.3 · ≤ 5.3.10
Configuration 2
- 8.0
Configuration 3
- n/a
Configuration 4
- n/a
Configuration 5
- n/a
Configuration 6
- n/a
Configuration 7
- n/a
Configuration 8
- n/a
- n/a
- n/a
- ≥ 11.0.0 · ≤ 11.70.1
- n/a
- n/a
- n/a
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-1160.11.1.el7
Fixed · RHSA-2020:5437
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7
Fixed · RHSA-2020:5441
Red Hat Enterprise Linux 8
kernel-0:4.18.0-193.el8
Fixed · RHSA-2020:1769
Red Hat Enterprise Linux 8
kernel-rt-0:4.18.0-193.rt13.51.el8
Fixed · RHSA-2020:1567
Red Hat Enterprise Linux 5
kernel
Out of support scope
Red Hat Enterprise Linux 6
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel-alt
Will not fix
Red Hat Enterprise MRG 2
kernel-rt
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-1160.11.1.el7 | Fixed | RHSA-2020:5437 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7 | Fixed | RHSA-2020:5441 |
| Red Hat Enterprise Linux 8 | kernel-0:4.18.0-193.el8 | Fixed | RHSA-2020:1769 |
| Red Hat Enterprise Linux 8 | kernel-rt-0:4.18.0-193.rt13.51.el8 | Fixed | RHSA-2020:1567 |
| Red Hat Enterprise Linux 5 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Will not fix | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat 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.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.60% (0.02605) | 84.83th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.60% (0.02605) | 83.31th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.53% (0.00530) | 65.24th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.25% (0.00246) | 65.20th | v3 (v2023.03.01) |
| May 11, 2024 | 0.25% (0.00246) | 64.48th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.35% (0.00350) | 71.03th | v3 (v2023.03.01) |
| Nov 20, 2023 | 0.35% (0.00350) | 68.73th | v3 (v2023.03.01) |
| Nov 5, 2023 | 0.36% (0.00361) | 69.23th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.30% (0.00302) | 64.77th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.18% (0.07176) | 80.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.36% (0.05363) | 79.74th | v1 |
| Jan 6, 2022 | 5.36% (0.05363) | 79.54th | v1 |
| Sep 1, 2021 | 1.25% (0.01247) | 68.62th | v1 |
| Apr 14, 2021 | 1.25% (0.01247) | 0.00th | v1 |
References (9)
- https://access.redhat.com/security/cve/CVE-2019-18282 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1796360 Issue Tracking
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10 x_refsource_MISCMailing ListVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2 x_refsource_CONFIRMMailing ListPatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-18282
- https://security.netapp.com/advisory/ntap-20200204-0002/ x_refsource_CONFIRMThird Party Advisory
- https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-18282
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-18282 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1796360 | Issue Tracking | |
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10 | x_refsource_MISCMailing ListVendor Advisory | |
| https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2 | x_refsource_CONFIRMMailing ListPatchVendor Advisory | |
| https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-18282 | ||
| https://security.netapp.com/advisory/ntap-20200204-0002/ | x_refsource_CONFIRMThird Party Advisory | |
| https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o | x_refsource_MISCThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-18282 |
Change history (0)
No recorded changes yet.