Description
An issue was discovered in the Linux kernel before 5.4.7. The prb_calc_retire_blk_tmo() function in net/packet/af_packet.c can result in a denial of service (CPU consumption and soft lockup) in a certain failure case involving TPACKET_V3, aka CID-b43d1f9f7067.
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 | 5.4.8-1 | — |
| Debian 13 | linux | 5.4.8-1 | — |
| Debian 12 | linux | 5.4.8-1 | — |
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 | 4.15.0-88.88 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1060.62 | — |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1013.14~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1012.13~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1052.55 | — |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1030.31 | — |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-40.32~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1053.53 | — |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1073.83 | — |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1039.44 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1033.36 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1055.59 | — |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1018.20~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1072.79 | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-173.203 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1101.112 | — |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1060.62~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1071.76 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1055.59 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-88.88~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1065.72 | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1033.36~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1128.137 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1132.140 | — |
Show 5 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 | 4.4.0-1028.33 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1061.65 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1071.76~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-173.203~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | perf +26 | 4.18.0-240.el8 | RHSA-2020:4431 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.5.1 | SUSE-SU-2020:2027-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.9.1.9.2.6 | SUSE-SU-2020:2105-1 |
| SLES 15 SP2 | kernel-docs | 5.3.18-24.9.2 | SUSE-SU-2020:2105-1 |
| SLES 15 SP2 | kernel-syms +4 | 5.3.18-24.9.1 | SUSE-SU-2020:2105-1 |
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.33.1 | SUSE-SU-2020:1604-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.45.1 | SUSE-SU-2020:1599-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.16.1 | SUSE-SU-2020:1587-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.23.1 | SUSE-SU-2020:1602-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.43.1 | SUSE-SU-2020:1603-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.54.1 | SUSE-SU-2020:1605-1 |
Show 21 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.127.1 | SUSE-SU-2020:2152-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_34 | 1-4.3.1 | SUSE-SU-2020:2152-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.138.1 | SUSE-SU-2020:2134-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_36 | 1-3.3.1 | SUSE-SU-2020:2134-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.16.1 | SUSE-SU-2020:1587-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.23.1 | SUSE-SU-2020:1602-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.43.1 | SUSE-SU-2020:1603-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.54.1 | SUSE-SU-2020:1605-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.127.1 | SUSE-SU-2020:2152-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_34 | 1-4.3.1 | SUSE-SU-2020:2152-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.138.1 | SUSE-SU-2020:2134-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_36 | 1-3.3.1 | SUSE-SU-2020:2134-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.13.1 | SUSE-SU-2020:2478-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.23.1 | SUSE-SU-2020:2156-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.9.1 | SUSE-SU-2020:2105-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_1 | 1-5.3.6 | SUSE-SU-2020:2105-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.45.1 | SUSE-SU-2020:1599-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_12 | 1-3.5.1 | SUSE-SU-2020:1599-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_18 | 1-1.5.1 | SUSE-SU-2020:1663-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.23.1 | SUSE-SU-2020:1602-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_5 | 1-8.3.1 | SUSE-SU-2020:1602-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.54.1 | SUSE-SU-2020:1605-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_14 | 1-6.3.1 | SUSE-SU-2020:1605-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.28.1 | SUSE-SU-2020:2487-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.127.1 | SUSE-SU-2020:2152-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_34 | 1-4.3.1 | SUSE-SU-2020:2152-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.127.1 | SUSE-SU-2020:2152-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_34 | 1-4.3.1 | SUSE-SU-2020:2152-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.138.1 | SUSE-SU-2020:2134-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_36 | 1-3.3.1 | SUSE-SU-2020:2134-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.127.1 | SUSE-SU-2020:2152-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_34 | 1-4.3.1 | SUSE-SU-2020:2152-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.127.1 | SUSE-SU-2020:2152-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_34 | 1-4.3.1 | SUSE-SU-2020:2152-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.26.2.lp152.8.2.2 | openSUSE-SU-2020:0935-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.26.2 | openSUSE-SU-2020:0935-1 |
| openSUSE Leap 15.2 | kernel-rt +3 | 5.3.18-lp152.3.5.1 | openSUSE-SU-2021:0242-1 |
| openSUSE Leap 15.1 | kernel-docs | 4.12.14-lp151.28.52.2 | openSUSE-SU-2020:0801-1 |
| openSUSE Leap 15.1 | kernel-obs-qa +1 | 4.12.14-lp151.28.52.3 | openSUSE-SU-2020:0801-1 |
| openSUSE Leap 15.1 | kernel-syms +5 | 4.12.14-lp151.28.52.1 | openSUSE-SU-2020:0801-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.49.1.el6uek | 0.4.5-3.el6 | ELSA-2020-5841 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.49.1.el7uek | 0.4.5-3.el7 | ELSA-2020-5841 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.49.1.el7uek | ELSA-2020-5866, ELSA-2020-5845, ELSA-2020-5841 |
| Oracle Linux 7 | perf +5 | 4.14.35-1902.306.2.el7uek | ELSA-2020-5845 |
Advisories 22
- RHSA-2020:4431 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- SUSE-SU-2020:2105-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0801-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0242-1 Security update for RT kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2156-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2487-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0935-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1603-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2478-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1663-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2134-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1587-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2152-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1604-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1602-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1599-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2027-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1605-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2022-2387 Google Android Patchday Dezember 2020 BSI CERT-Bund (WID) · May 30, 2023
- ELSA-2020-5866 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-5845 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 11, 2020
- ELSA-2020-5841 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 10, 2020
References
- openSUSE-SU-2020:0801 vendor-advisory
- openSUSE-SU-2020:0935 vendor-advisory
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b43d1f9f7067c6759b1051e8ecb84e82cef569fe
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.7