Description
In the Linux kernel before 5.4.16, a race condition in tty->disc_data handling in the slip and slcan line discipline could lead to a use-after-free, aka CID-0ace17d56824. This affects drivers/net/slip/slip.c and drivers/net/can/slcan.c.
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 | 5.4.19-1 | — |
| Debian 13 | linux | 5.4.19-1 | — |
| Debian 12 | linux | 5.4.19-1 | — |
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 | 4.15.0-91.92 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1063.67 | — |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1016.17~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1014.15~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1055.58 | — |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1032.33 | — |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-42.34~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1056.57 | — |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1076.86 | — |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1043.48 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1035.39 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1057.61 | — |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1019.21~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1074.81 | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-176.206 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1104.115 | — |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1063.67~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1075.80 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1058.62 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-91.92~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1068.75 | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1035.38~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1130.139 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1134.142 | — |
Show 8 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 | 4.4.0-1031.36 | — |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-45.49 | LSN-0069-1 |
| Ubuntu Pro 20.04 LTS | linux-aws +1 | 5.4.0-1022.22 | LSN-0069-1 |
| Ubuntu Pro 20.04 LTS | linux-azure | 5.4.0-1023.23 | LSN-0069-1 |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-112.113 | LSN-0069-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1079.83 | LSN-0069-1 |
| Ubuntu Pro 18.04 LTS | linux-oem | 4.15.0-1093.103 | LSN-0069-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-184.214 | LSN-0069-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1109.120 | LSN-0069-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1064.68 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1074.79~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-176.206~14.04.1 | — |
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 | 4.12.14-8.38.1 | SUSE-SU-2020:2103-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.48.1 | SUSE-SU-2020:2107-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.55.1 | SUSE-SU-2020:2106-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.22.1 | SUSE-SU-2020:2119-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.29.1 | SUSE-SU-2020:2122-1 |
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.57.1 | SUSE-SU-2020:2121-1 |
Show 24 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 11 SP4 | kernel-ec2 +8 | 3.0.101-108.117.1 | SUSE-SU-2020:14442-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.55.1 | SUSE-SU-2020:2106-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.22.1 | SUSE-SU-2020:2119-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.29.1 | SUSE-SU-2020:2122-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.57.1 | SUSE-SU-2020:2121-1 |
| 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 | 4.12.14-197.48.1 | SUSE-SU-2020:2107-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_13 | 1-3.3.1 | SUSE-SU-2020:2107-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.55.1 | SUSE-SU-2020:2106-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_19 | 1-1.3.1 | SUSE-SU-2020:2106-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.29.1 | SUSE-SU-2020:2122-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_7 | 1-8.3.1 | SUSE-SU-2020:2122-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.57.1 | SUSE-SU-2020:2121-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_15 | 1-6.3.1 | SUSE-SU-2020:2121-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.55.1 | SUSE-SU-2020:2106-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.28.1 | SUSE-SU-2020:2487-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.57.1 | SUSE-SU-2020:2121-1 |
| 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 9 | kernel-syms +2 | 4.12.14-95.57.1 | SUSE-SU-2020:2121-1 |
| 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 +8 | 4.12.14-lp151.28.59.1 | openSUSE-SU-2020:1153-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.41.4.el7uek | ELSA-2020-5801 |
Advisories 19
- LSN-0069-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- SUSE-SU-2020:2105-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1153-1 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-2020:2119-1 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
- SUSE-SU-2020:2107-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2121-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14442-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2122-1 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-2020:2478-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2103-1 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-2020:2152-1 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-2020:2106-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2020-5801 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 6, 2020
References
- https://bugzilla.suse.com/show_bug.cgi?id=1162002
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ace17d56824165c7f4c68785d6b58971db954dd
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.16
- openSUSE-SU-2020:0935 vendor-advisory
- openSUSE-SU-2020:1153 vendor-advisory