Description
An issue was discovered in the Linux kernel through 4.17.10. There is an invalid pointer dereference in __del_reloc_root() in fs/btrfs/relocation.c when mounting a crafted btrfs image, related to removing reloc rb_trees when reloc control has not been initialized.
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 | 4.18.8-1 | — |
| Debian 13 | linux | 4.18.8-1 | — |
| Debian 12 | linux | 4.18.8-1 | — |
| Debian 9 | linux | 4.9.110-3+deb9u5 | DSA-4308-1 |
| Debian 8 | linux | 3.16.59-1 | DLA-1529-1 |
| Debian 8 | linux-4.9 | 4.9.110-3+deb9u5~deb8u1 | DLA-1531-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | linux-vmware | No fix yet | — |
| 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 +3 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-58.64 | USN-4094-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1047.49 | USN-4118-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.18.0-1011.11~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +1 | 4.15.0-1040.42 | USN-4094-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1042.42 | USN-4094-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1050.57 | USN-4094-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1021.23 | USN-4094-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1043.46 | USN-4094-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1060.66 | USN-4094-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux | 4.4.0-139.165 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1072.82 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1047.49~16.04.1 | USN-4118-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1055.60 | USN-4094-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1040.42~16.04.1 | USN-4094-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-58.64~16.04.1 | USN-4094-1 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1037.43 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1021.23~16.04.1 | USN-4094-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1100.108 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1104.109 | USN-3821-1 |
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1034.37 | USN-3821-2 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-139.165~14.04.1 | USN-3821-2 |
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | 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 | 4.4.0-1008.10 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1059.64~14.04.1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.30.1.el6uek | 0.4.5-3.el6 | ELSA-2019-4532 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.30.1.el7uek | 0.4.5-3.el7 | ELSA-2019-4532 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.30.1.el7uek | ELSA-2019-4570, ELSA-2019-4532 |
| Oracle Linux 7 | perf +5 | 4.14.35-1844.3.2.el7uek | ELSA-2019-4570 |
Advisories 9
- USN-4094-1 linux, linux-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-4118-1 linux-aws vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-3821-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3821-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-4308-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1529-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1531-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ELSA-2019-4570 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 12, 2019
- ELSA-2019-4532 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 6, 2019
References
- USN-3821-1 vendor-advisory
- 104917 vdb-entry
- [debian-lts-announce] 20181003 [SECURITY] [DLA 1531-1] linux-4.9 security update mailing-list
- https://patchwork.kernel.org/patch/10500521/
- USN-3821-2 vendor-advisory
- DSA-4308 vendor-advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=199833
- USN-4094-1 vendor-advisory
- USN-4118-1 vendor-advisory