Description
net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.
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 | 5.10.46-1 | — |
| Debian 13 | linux | 5.10.46-1 | — |
| Debian 12 | linux | 5.10.46-1 | — |
| Debian 10 | linux | 4.19.194-3 | DSA-4941-1 |
| Debian 9 | linux | 4.9.272-2 | DLA-2713-1 |
| Debian 9 | linux-4.19 | 4.19.194-3~deb9u1 | DLA-2714-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-81.91 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1055.58 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-aws-5.11 +1 | 5.11.0-1017.18~20.04.1 | USN-5070-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1056.58 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-azure-5.11 | 5.11.0-1015.16~20.04.1 | USN-5070-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1019.22 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1051.55 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.11 | 5.11.0-1018.20~20.04.2 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1051.54 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1022.23 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.11 | 5.11.0-34.36~20.04.1 | USN-5070-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1045.47 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1038.40 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1053.57 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1042.46 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-riscv +8 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.11 | 5.11.0-1018.19~20.04.2 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-156.163 | USN-5073-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1111.118 | USN-5073-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1055.58~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1123.136 | USN-5073-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1056.58~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1027.32 | USN-5073-1 |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1108.122 | USN-5073-2 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1051.55~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1051.54~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1022.23~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-81.91~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1099.101 | USN-5073-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1080.88 | USN-5073-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1053.57~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1042.46~18.04.3 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1095.101 | USN-5073-3 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1112.121 | USN-5073-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1032.37 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2053.55 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2035.39 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1069.78 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2018.20 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1069.75 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-219.252 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1135.149 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1111.118~16.04.1 | USN-5073-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1123.136~16.04.1 | USN-5073-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1108.122~16.04.1 | USN-5073-2 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-156.163~16.04.1 | USN-5073-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1100.109 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1080.88~16.04.1 | USN-5073-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1099.104 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1123.136~14.04.1 | USN-5073-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-219.252~14.04.1 | USN-5343-1, USN-5299-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-59.13.1 | SUSE-SU-2021:2352-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-38.11.1 | SUSE-SU-2021:2305-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.13.1.18.6.1 | SUSE-SU-2021:2352-1 |
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.53.1 | SUSE-SU-2021:2303-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.70.1.9.32.1 | SUSE-SU-2021:2325-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.70.1 | SUSE-SU-2021:2325-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.75.1 | SUSE-SU-2021:2421-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.62.1 | SUSE-SU-2021:2321-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.77.1 | SUSE-SU-2021:2324-1 |
Show 29 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.80.1 | SUSE-SU-2021:2422-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.147.1 | SUSE-SU-2021:2451-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_40 | 1-4.3.1 | SUSE-SU-2021:2451-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.158.1 | SUSE-SU-2021:2406-1 |
| SLES 11 SP4 | kernel-ec2 +8 | 3.0.101-108.129.1 | SUSE-SU-2021:14764-1 |
| SLES for SAP 15 SP1 | kernel-docs +4 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.75.1 | SUSE-SU-2021:2421-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.62.1 | SUSE-SU-2021:2321-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.77.1 | SUSE-SU-2021:2324-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.80.1 | SUSE-SU-2021:2422-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.147.1 | SUSE-SU-2021:2451-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_40 | 1-4.3.1 | SUSE-SU-2021:2451-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.49.1 | SUSE-SU-2021:2349-1 |
| SLE Micro 5.0 | kernel-default | 5.3.18-24.70.1 | SUSE-SU-2021:2325-1 |
| SLE Micro 5.0 | kernel-default-base | 5.3.18-24.70.1.9.32.1 | SUSE-SU-2021:2325-1 |
| SLE Micro 5.0 | kernel-rt | 4.12.14-10.49.1 | SUSE-SU-2021:2349-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.13.1 | SUSE-SU-2021:2352-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_3 | 1-7.3.1 | SUSE-SU-2021:2352-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.70.1 | SUSE-SU-2021:2325-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_16 | 1-5.3.1 | SUSE-SU-2021:2325-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_26 | 1-3.3.3 | SUSE-SU-2021:2427-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.75.1 | SUSE-SU-2021:2421-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_25 | 1-1.3.1 | SUSE-SU-2021:2421-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.77.1 | SUSE-SU-2021:2324-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_20 | 1-8.3.1 | SUSE-SU-2021:2324-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.80.1 | SUSE-SU-2021:2422-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_22 | 1-6.3.1 | SUSE-SU-2021:2422-1 |
| SLE HPC 15 SP1 | kernel-docs +4 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.75.1 | SUSE-SU-2021:2421-1 |
| SUSE Real Time Module 15 SP2 | kernel-rt +1 | 5.3.18-42.2 | SUSE-SU-2021:2426-1 |
| SUSE Real Time Module 15 SP2 | kernel-syms-rt +1 | 5.3.18-42.1 | SUSE-SU-2021:2426-1 |
| SUSE Real Time Module 15 SP2 | lttng-modules | 2.10.10-1.5.1 | SUSE-SU-2021:2426-1 |
| SUSE Real Time Module 15 SP2 | oracleasm | 2.0.8-1.3.1 | SUSE-SU-2021:2426-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.80.1 | SUSE-SU-2021:2422-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.147.1 | SUSE-SU-2021:2451-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_40 | 1-4.3.1 | SUSE-SU-2021:2451-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.80.1 | SUSE-SU-2021:2422-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.147.1 | SUSE-SU-2021:2451-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_40 | 1-4.3.1 | SUSE-SU-2021:2451-1 |
| SUSE Manager Server 4.0 | kernel-docs +5 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-docs +4 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SUSE Manager Proxy 4.0 | kernel-docs +4 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.147.1 | SUSE-SU-2021:2451-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_40 | 1-4.3.1 | SUSE-SU-2021:2451-1 |
| SUSE Enterprise Storage 6 | kernel-docs +4 | 4.12.14-197.99.1 | SUSE-SU-2021:2427-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | kernel-64kb +6 | 5.3.18-59.13.1 | openSUSE-SU-2021:2352-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-38.11.1 | openSUSE-SU-2021:2305-1 |
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-197.99.1 | openSUSE-SU-2021:2427-1, openSUSE-SU-2021:2352-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.13.1.18.6.1 | openSUSE-SU-2021:2352-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.10.78.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.54.6.el7uek | ELSA-2021-9452, ELSA-2021-9442 |
| Oracle Linux 7 | kernel-uek-container | 4.14.35-2047.507.7.4.el7 | ELSA-2021-9453 |
| Oracle Linux 7 | perf +5 | 4.14.35-2047.507.7.4.el7uek | ELSA-2021-9452 |
Advisories 30
- USN-5299-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5343-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5073-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-hwe, linux-kvm, linux-oracle, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5073-2 linux-gcp, linux-gcp-4.15 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5070-1 linux, linux-aws, linux-aws-5.11, linux-azure, linux-azure-5.11, linux-gcp, linux-hwe-5.11, linux-kvm, linux-oracle, linux-oracle-5.11, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-5045-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-5073-3 linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-4941-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2714-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2713-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:2451-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2426-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2422-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2325-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2305-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2421-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2349-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2352-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2321-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2305-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2324-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2303-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2427-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2406-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2427-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2352-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14764-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2021-9453 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 21, 2021
- ELSA-2021-9452 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 21, 2021
- ELSA-2021-9442 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 8, 2021
References
- https://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/
- [oss-security] 20210615 CVE-2021-34693: Infoleak in CAN BCM protocol in Linux kernel mailing-list
- [debian-lts-announce] 20210720 [SECURITY] [DLA 2713-2] linux security update mailing-list
- [debian-lts-announce] 20210720 [SECURITY] [DLA 2713-1] linux security update mailing-list
- [debian-lts-announce] 20210720 [SECURITY] [DLA 2714-1] linux-4.19 security update mailing-list
- DSA-4941 vendor-advisory
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc