Description
In the Linux kernel before 5.1.7, a device can be tracked by an attacker 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). An attack may be conducted by hosting a crafted web page that uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP addresses.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.2.6-1 | — |
| Debian 13 | linux | 5.2.6-1 | — |
| Debian 12 | linux | 5.2.6-1 | — |
| Debian 10 | linux | 4.19.37-5+deb10u2 | DSA-4495-1 |
| Debian 9 | linux | 4.9.168-1+deb9u5 | DSA-4497-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | linux | 3.16.72-1 | DLA-1884-1 |
| Debian 8 | linux-4.9 | 4.9.168-1+deb9u5~deb8u1 | DLA-1885-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-60.67 | USN-4115-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1047.49 | USN-4118-1 |
| Ubuntu 18.04 LTS | linux-azure | 5.0.0-1018.19~18.04.1 | USN-4114-1 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1042.45 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1041.43 | USN-4115-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1015.15~18.04.1 | USN-4114-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.0.0-27.28~18.04.1 | USN-4114-1 |
| Ubuntu 18.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1043.43 | USN-4115-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1056.65 | — |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1020.22 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1022.25 | USN-4115-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1044.47 | USN-4115-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1062.69 | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-161.189 | USN-4116-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1092.103 | USN-4116-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1047.49~16.04.1 | USN-4118-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1056.61 | USN-4115-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1041.43 | USN-4115-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-60.67~16.04.1 | USN-4115-1 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1056.63 | USN-4116-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1022.25~16.04.1 | USN-4115-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1120.129 | USN-4116-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1124.130 | USN-4116-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1019.24 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1054.58 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1059.64~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-164.192~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-147.rt24.93.el8 | RHSA-2019:3309 |
| RHEL 8 | perf +26 | 4.18.0-147.el8 | RHSA-2019:3517 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1127.rt56.1093.el7 | RHSA-2020:1070 |
| RHEL 7 | perf +18 | 3.10.0-1127.el7 | RHSA-2020:1016 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.13.1 | SUSE-SU-2019:2069-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.10.1 | SUSE-SU-2019:1854-1 |
| SLES 15 | kernel-azure +2 | 4.12.14-5.33.1 | SUSE-SU-2019:1829-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.27.1 | SUSE-SU-2019:1855-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.24.1 | SUSE-SU-2019:1851-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.100.1 | SUSE-SU-2019:1852-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_27 | 1-4.3.1 | SUSE-SU-2019:1852-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.117.1 | SUSE-SU-2019:1823-2, SUSE-SU-2019:1823-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_31 | 1-3.3.1 | SUSE-SU-2019:1823-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.24.1 | SUSE-SU-2019:1851-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.100.1 | SUSE-SU-2019:1852-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_27 | 1-4.3.1 | SUSE-SU-2019:1852-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.117.1 | SUSE-SU-2019:1823-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_31 | 1-3.3.1 | SUSE-SU-2019:1823-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.3.1 | SUSE-SU-2019:2450-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.10.1 | SUSE-SU-2019:1854-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_3 | 1-3.3.1 | SUSE-SU-2019:1854-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.27.1 | SUSE-SU-2019:1855-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_12 | 1-1.5.1 | SUSE-SU-2019:1855-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_6 | 1-6.5.1 | SUSE-SU-2019:1851-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.8.1 | SUSE-SU-2019:2430-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.100.1 | SUSE-SU-2019:1852-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_27 | 1-4.3.1 | SUSE-SU-2019:1852-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.117.1 | SUSE-SU-2019:1823-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_31 | 1-3.3.1 | SUSE-SU-2019:1823-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.100.1 | SUSE-SU-2019:1852-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_27 | 1-4.3.1 | SUSE-SU-2019:1852-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.117.1 | SUSE-SU-2019:1823-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_31 | 1-3.3.1 | SUSE-SU-2019:1823-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | kernel-docs +8 | 4.12.14-lp151.28.10.1 | openSUSE-SU-2019:1757-1 |
| openSUSE Leap 15.0 | kernel-docs +8 | 4.12.14-lp150.12.67.1 | openSUSE-SU-2019:1716-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | hyperv-daemons | 6.6.35.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-147.el8 | ELSA-2019-3517 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.42.3.el7uek | ELSA-2020-5845, ELSA-2020-5837 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-1902.306.2.el7uek | ELSA-2020-5845 |
| Oracle Linux 7 | perf +12 | 3.10.0-1127.el7 | ELSA-2020-5845, ELSA-2020-1016 |
Advisories 28
- USN-4115-1 linux, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-4114-1 linux, linux-azure, linux-gcp, linux-gke-5.0, linux-hwe, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-4118-1 linux-aws vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-4116-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- RHSA-2019:3517 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:1070 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:1016 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:3309 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-4497-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4495-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1885-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1884-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:1823-2 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1855-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1851-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2450-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1852-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1829-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1757-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2069-1 Security update for the Linux Kernel for Azure SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2430-1 Security update for kernel-source-rt SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1823-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1716-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1854-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2020-5845 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 11, 2020
- ELSA-2020-5837 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 3, 2020
- ELSA-2020-1016 Moderate: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 6, 2020
- ELSA-2019-3517 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
References
- 109092 vdb-entry
- openSUSE-SU-2019:1716 vendor-advisory
- openSUSE-SU-2019:1757 vendor-advisory
- DSA-4495 vendor-advisory
- 20190812 [SECURITY] [DSA 4495-1] linux security update mailing-list
- 20190813 [SECURITY] [DSA 4497-1] linux security update mailing-list
- DSA-4497 vendor-advisory
- [debian-lts-announce] 20190814 [SECURITY] [DLA 1884-1] linux security update mailing-list
- [debian-lts-announce] 20190814 [SECURITY] [DLA 1885-1] linux-4.9 security update mailing-list
- USN-4117-1 vendor-advisory
- USN-4114-1 vendor-advisory
- USN-4115-1 vendor-advisory
- USN-4116-1 vendor-advisory
- USN-4118-1 vendor-advisory
- RHSA-2019:3309 vendor-advisory
- RHSA-2019:3517 vendor-advisory
- 20191108 [slackware-security] Slackware 14.2 kernel (SSA:2019-311-01) mailing-list
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8
- https://github.com/torvalds/linux/commit/355b98553789b646ed97ad801a619ff898471b92
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=355b98553789b646ed97ad801a619ff898471b92
- https://arxiv.org/pdf/1906.10478.pdf
- https://github.com/torvalds/linux/commit/55f0fc7a02de8f12757f4937143d8d5091b2e40b
- https://github.com/torvalds/linux/commit/df453700e8d81b1bdafdf684365ee2b9431fb702
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=df453700e8d81b1bdafdf684365ee2b9431fb702
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.7
- https://security.netapp.com/advisory/ntap-20190806-0001/
- http://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html