Description
In the Linux kernel 5.0.21, mounting a crafted f2fs filesystem image can lead to slab-out-of-bounds read access in f2fs_build_segment_manager in fs/f2fs/segment.c, related to init_min_max_mtime in fs/f2fs/segment.c (because the second argument to get_seg_entry is not validated).
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 | No fix yet | — |
| Debian 13 | linux | No fix yet | — |
| Debian 12 | linux | No fix yet | — |
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 | 5.4.0-90.101 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1059.62 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1063.66 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-azure-5.8 | 5.8.0-1043.46~20.04.1 | USN-5120-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1021.24 | USN-5137-2 |
| Ubuntu 20.04 LTS | linux-gcp +1 | 5.4.0-1057.61 | USN-5137-2, USN-5137-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1055.58 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1026.27 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1007.8 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1049.51 | USN-5137-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1046.50 | USN-5137-2 |
| Ubuntu 20.04 LTS | linux-riscv +7 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-162.170 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1115.122 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1059.62~18.04.1 | USN-5137-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1126.139 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1063.66~18.04.1 | USN-5137-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1030.35 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1111.125 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 +1 | 5.4.0-1057.61~18.04.1 | USN-5137-2, USN-5137-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1055.58~18.04.1 | USN-5137-2 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1026.27~18.04.1 | USN-5137-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-90.101~18.04.1 | USN-5137-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1102.104 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1083.91 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1046.50~18.04.1 | USN-5137-2 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1098.104 | USN-5136-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1115.124 | USN-5136-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 9 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 | 5.4.0-1036.42 | — |
| 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 | 4.15.0-2056.58 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2038.42 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1072.81 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2021.23 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1072.78 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-222.255 | USN-5343-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1138.152 | USN-5343-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1115.122~16.04.1 | USN-5136-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1126.139~16.04.1 | USN-5136-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1111.125~16.04.1 | USN-5136-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-162.170~16.04.1 | USN-5136-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1103.112 | USN-5343-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1083.91~16.04.1 | USN-5136-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1102.107 | USN-5343-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1126.139~14.04.1 | USN-5136-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-222.255~14.04.1 | USN-5343-1 |
Advisories 5
- USN-5136-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5137-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-ibm, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5137-2 linux-bluefield, linux-gke-5.4, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5120-1 linux-azure-5.8 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5343-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026