Description
An issue was discovered in slc_bump in drivers/net/can/slcan.c in the Linux kernel 3.16 through 5.6.2. It allows attackers to read uninitialized can_frame data, potentially containing sensitive information from kernel stack memory, if the configuration lacks CONFIG_INIT_STACK_ALL, aka CID-b9258a2cece4.
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 | 5.5.17-1 | — |
| Debian 13 | linux | 5.5.17-1 | — |
| Debian 12 | linux | 5.5.17-1 | — |
| Debian 9 | linux | 4.9.210-1+deb9u1 | DSA-4698-1 |
| Debian 8 | linux | 3.16.84-1 | DLA-2241-1 |
| Debian 8 | linux-4.9 | 4.9.210-1+deb9u1~deb8u1 | DLA-2242-1 |
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 20.04 LTS | linux-oem-5.6 | 5.6.0-1008.8 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1011.11 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-101.102 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1067.71 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-aws-5.3 | 5.3.0-1019.21~18.04.1 | USN-4369-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1083.93 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1022.23~18.04.1 | USN-4369-1 |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1020.22~18.04.1 | USN-4369-1 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1059.62 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1037.38 | USN-4368-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-53.47~18.04.1 | USN-4369-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1060.61 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1081.91 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1052.57 | USN-4368-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1039.43 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.3 | 5.3.0-1018.20~18.04.1 | USN-4369-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1062.66 | USN-4363-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1026.28~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1079.86 | USN-4363-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-179.209 | USN-4364-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1107.118 | USN-4364-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1067.71~16.04.1 | USN-4363-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1083.93~16.04.1 | USN-4363-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1071.81~16.04.1 | USN-4363-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-101.102~16.04.1 | USN-4363-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1071.78 | USN-4364-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1039.43~16.04.1 | USN-4363-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1133.142 | USN-4364-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1137.145 | USN-4364-1 |
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 18.04 LTS | linux-fips | 4.15.0-1029.34 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1034.39 | — |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-51.56 | LSN-0072-1 |
| Ubuntu Pro 20.04 LTS | linux-aws +1 | 5.4.0-1028.29 | LSN-0072-1 |
| Ubuntu Pro 20.04 LTS | linux-azure | 5.4.0-1031.32 | LSN-0072-1 |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-101.102 | LSN-0072-1, LSN-0068-1, LSN-0067-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1067.71 | LSN-0072-1, LSN-0068-1, LSN-0067-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp +1 | No fix yet | LSN-0067-1 |
| Ubuntu Pro 18.04 LTS | linux-oem | 4.15.0-1081.91 | LSN-0072-1, LSN-0068-1, LSN-0067-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-179.209 | LSN-0072-1, LSN-0068-1, LSN-0067-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1107.118 | LSN-0072-1, LSN-0068-1, LSN-0067-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1067.71 | USN-4364-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1083.93~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-179.209~14.04.1 | USN-4364-1, LSN-0072-1, LSN-0068-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.30.1 | SUSE-SU-2020:1087-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.40.1 | SUSE-SU-2020:1146-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.13.1 | SUSE-SU-2020:1118-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.20.1 | SUSE-SU-2020:1142-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.40.1 | SUSE-SU-2020:1119-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.51.1 | SUSE-SU-2020:1141-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| 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 | 4.12.14-16.13.1 | SUSE-SU-2020:1118-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.20.1 | SUSE-SU-2020:1142-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.40.1 | SUSE-SU-2020:1119-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.51.1 | SUSE-SU-2020:1141-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.8.1 | SUSE-SU-2020:1084-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.18.1 | SUSE-SU-2020:1085-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.40.1 | SUSE-SU-2020:1146-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_11 | 1-3.3.1 | SUSE-SU-2020:1146-1 |
| 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 | 4.12.14-122.20.1 | SUSE-SU-2020:1142-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_4 | 1-8.3.1 | SUSE-SU-2020:1142-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.51.1 | SUSE-SU-2020:1141-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_13 | 1-6.3.1 | SUSE-SU-2020:1141-1 |
| 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 | 4.12.14-14.23.1 | SUSE-SU-2020:1123-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | kernel-docs +8 | 4.12.14-lp151.28.48.1 | openSUSE-SU-2020:0543-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.39.1.el7uek | ELSA-2020-5676, ELSA-2020-5670, ELSA-2020-5663 |
| Oracle Linux 7 | perf +5 | 4.14.35-1902.302.2.el7uek | ELSA-2020-5676, ELSA-2020-5663 |
Advisories 26
- LSN-0068-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4368-1 linux-gke-5.0, linux-oem-osp1 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4369-1 linux, linux-aws, linux-aws-5.3, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4364-1 linux, linux-aws, linux-kvm, linux-lts-xenial, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4363-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- LSN-0072-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- LSN-0067-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-4698-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2242-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2241-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:1255-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1087-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1118-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0543-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1123-1 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-2020:1084-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1142-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1141-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1146-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1119-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1085-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:1275-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2020-5676 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 11, 2020
- ELSA-2020-5670 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 6, 2020
- ELSA-2020-5663 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 27, 2020
References
- https://github.com/torvalds/linux/commit/b9258a2cece4ec1f020715fe3554bc2e360f6264
- openSUSE-SU-2020:0543 vendor-advisory
- https://security.netapp.com/advisory/ntap-20200430-0004/
- USN-4364-1 vendor-advisory
- USN-4368-1 vendor-advisory
- USN-4363-1 vendor-advisory
- USN-4369-1 vendor-advisory
- [debian-lts-announce] 20200609 [SECURITY] [DLA 2241-1] linux security update mailing-list
- [debian-lts-announce] 20200610 [SECURITY] [DLA 2242-1] linux-4.9 security update mailing-list
- [debian-lts-announce] 20200610 [SECURITY] [DLA 2241-2] linux security update mailing-list
- DSA-4698 vendor-advisory
- http://packetstormsecurity.com/files/159565/Kernel-Live-Patch-Security-Notice-LSN-0072-1.html
- https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=08fadc32ce6239dc75fd5e869590e29bc62bbc28