Description
A race condition was discovered in get_old_root in fs/btrfs/ctree.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (BUG) because of a lack of locking on an extent buffer before a cloning operation, aka CID-dbcc7d57bffc.
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 | 5.10.26-1 | — |
| Debian 13 | linux | 5.10.26-1 | — |
| Debian 12 | linux | 5.10.26-1 | — |
| Debian 9 | linux | 4.9.272-1 | DLA-2689-1 |
| Debian 9 | linux-4.19 | 4.19.194-1~deb9u1 | DLA-2690-1 |
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 | 5.4.0-74.83 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1049.51 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1048.50 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1012.15 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1044.47 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1044.46 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1016.17 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-55.62~20.04.1 | USN-4984-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1040.41 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1025.26 | USN-4948-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1046.50 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1036.39 | USN-4982-1 |
| Ubuntu 20.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.8 | 5.8.0-26.28~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-144.148 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1103.110 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1049.51~18.04.1 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1115.128 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1048.50~18.04.1 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1022.26 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1100.113 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1044.47~18.04.2 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1044.46~18.04.1 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1016.17~18.04.1 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-74.83~18.04.1 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1092.94 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1072.80 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1046.50~18.04.2 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1036.39~18.04.1 | USN-4982-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1086.91 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1103.112 | USN-4979-1 |
| 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-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2045.47 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2027.30 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1060.68 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1073.79 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-223.256 | USN-5361-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1139.153 | USN-5361-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1103.110~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1115.128~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1100.113~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-144.148~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1104.113 | USN-5361-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1072.80~16.04.1 | USN-4979-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1103.108 | USN-5361-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1115.128~14.04.1 | USN-4979-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-223.256~14.04.1 | USN-5361-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +5 | 5.3.18-59.5.2 | SUSE-SU-2021:1977-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-38.3.1 | SUSE-SU-2021:1975-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.5.2.18.2.2 | SUSE-SU-2021:1977-1 |
| SLES 15 SP3 | kernel-syms +1 | 5.3.18-59.5.1 | SUSE-SU-2021:1977-1 |
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.41.1 | SUSE-SU-2021:1177-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.61.1.9.26.4 | SUSE-SU-2021:1238-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.61.1 | SUSE-SU-2021:1238-1 |
| SLES 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLES 15 SP1 | kernel-syms +4 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLES 15 | kernel-docs | 4.12.14-150.72.2 | SUSE-SU-2021:1573-1 |
| SLES 15 | kernel-syms +5 | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.50.1 | SUSE-SU-2021:1175-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.66.2 | SUSE-SU-2021:1210-1 |
Show 22 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SLES for SAP 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLES for SAP 15 SP1 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLES for SAP 15 | kernel-docs | 4.12.14-150.72.2 | SUSE-SU-2021:1573-1 |
| SLES for SAP 15 | kernel-syms +4 | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.50.1 | SUSE-SU-2021:1175-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.66.2 | SUSE-SU-2021:1210-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.37.1 | SUSE-SU-2021:1176-1 |
| SLE Micro 5.0 | kernel-default | 5.3.18-24.61.1 | SUSE-SU-2021:1238-1 |
| SLE Micro 5.0 | kernel-default-base | 5.3.18-24.61.1.9.26.4 | SUSE-SU-2021:1238-1 |
| SLE Micro 5.0 | kernel-rt | 5.3.18-8.7.1 | SUSE-SU-2021:1625-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.5.2 | SUSE-SU-2021:1977-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_1 | 1-7.5.1 | SUSE-SU-2021:1977-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.61.1 | SUSE-SU-2021:1238-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_12 | 1-5.3.4 | SUSE-SU-2021:1238-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_24 | 1-3.3.2 | SUSE-SU-2021:1624-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_24 | 1-1.3.1 | SUSE-SU-2021:1573-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.66.2 | SUSE-SU-2021:1210-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_17 | 1-8.3.2 | SUSE-SU-2021:1210-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_20 | 1-6.3.1 | SUSE-SU-2021:1596-1 |
| SLE HPC 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLE HPC 15 SP1 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLE HPC 15 | kernel-docs | 4.12.14-150.72.2 | SUSE-SU-2021:1573-1 |
| SLE HPC 15 | kernel-syms +4 | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SUSE Real Time Module 15 SP2 | kernel-rt +3 | 5.3.18-33.1 | SUSE-SU-2021:1211-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SUSE Manager Server 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Server 4.0 | kernel-syms +4 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Manager Proxy 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Proxy 4.0 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Enterprise Storage 6 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Enterprise Storage 6 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | kernel-64kb +7 | 5.3.18-59.5.2 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-38.3.1 | openSUSE-SU-2021:1975-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.5.2.18.2.2 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.3 | kernel-syms +2 | 5.3.18-59.5.1 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.69.1.lp152.8.28.1 | openSUSE-SU-2021:0532-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.69.1 | openSUSE-SU-2021:0532-1 |
| openSUSE Leap 15.2 | kernel-rt +3 | 5.3.18-lp152.3.8.1 | openSUSE-SU-2021:0758-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.231-173.360 | 1.0-0.amzn2 | ALAS2-2021-1627 |
| Amazon Linux 2 | perf +8 | 4.14.231-173.360.amzn2 | ALAS2-2021-1627 |
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 | 4.1.12-124.50.2.el7uek | ELSA-2021-9222, ELSA-2021-9220, ELSA-2021-9215 |
| Oracle Linux 7 | kernel-uek-container | 4.14.35-2047.503.1.el7 | ELSA-2021-9223, ELSA-2021-9221 |
| Oracle Linux 7 | kernel-uek-container-debug | 5.4.17-2102.201.3.el8 | ELSA-2021-9221 |
| Oracle Linux 7 | perf +5 | 4.14.35-2047.503.1.el7uek | ELSA-2021-9222, ELSA-2021-9220 |
Advisories 29
- USN-5361-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-4979-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-4984-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4948-1 linux-oem-5.10 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4982-1 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
- DLA-2689-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2690-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1238-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1573-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1211-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1210-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1975-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1625-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1596-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1177-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1175-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0758-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1624-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0532-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1176-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1975-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2021:1977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2021-1627 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 15, 2021
- ELSA-2021-9221 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 1, 2021
- ELSA-2021-9220 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 10, 2021
- ELSA-2021-9223 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 10, 2021
- ELSA-2021-9222 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 10, 2021
- ELSA-2021-9215 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 6, 2021
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbcc7d57bffc0c8cac9dac11bec548597d59a6a5
- FEDORA-2021-e636ce53df vendor-advisory
- FEDORA-2021-68b0dd2373 vendor-advisory
- FEDORA-2021-9503fffad9 vendor-advisory
- https://security.netapp.com/advisory/ntap-20210430-0003/
- [debian-lts-announce] 20210623 [SECURITY] [DLA 2689-1] linux security update mailing-list
- [debian-lts-announce] 20210623 [SECURITY] [DLA 2690-1] linux-4.19 security update mailing-list