Description
An issue was discovered in fs/io_uring.c in the Linux kernel before 5.6. It unsafely handles the root directory during path lookups, and thus a process inside a mount namespace can escape to unintended filesystem locations, aka CID-ff002b30181d.
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 | 5.6.7-1 | — |
| Debian 13 | linux | 5.6.7-1 | — |
| Debian 12 | linux | 5.6.7-1 | — |
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 +4 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gke-5.3 | 5.3.0-1018.19~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1023.25~18.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.32.1 | SUSE-SU-2021:0096-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.46.1.9.19.1 | SUSE-SU-2021:0117-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.46.1 | SUSE-SU-2021:0117-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.46.1 | SUSE-SU-2021:0117-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_0 | 7-5.2 | SUSE-SU-2021:0367-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_1 | 6-2.1 | SUSE-SU-2021:0367-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_10 | 2-2.2 | SUSE-SU-2021:0869-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_2 +2 | 5-2.1 | SUSE-SU-2021:0367-1, SUSE-SU-2021:0362-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_5 +2 | 3-2.1 | SUSE-SU-2021:0362-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_8 | 2-2.1 | SUSE-SU-2021:0362-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_9 | 1-5.3.1 | SUSE-SU-2021:0359-1, SUSE-SU-2021:0117-1 |
| SUSE Real Time Module 15 SP2 | kernel-rt +3 | 5.3.18-22.1 | SUSE-SU-2021:0108-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.60.1 | openSUSE-SU-2021:0060-1 |
| openSUSE Leap 15.2 | kernel-rt +3 | 5.3.18-lp152.3.5.1 | openSUSE-SU-2021:0242-1 |
Advisories 9
- SUSE-SU-2021:0367-1 Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0108-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0242-1 Security update for RT kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0359-1 Security update for the Linux Kernel (Live Patch 9 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0096-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0117-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0362-1 Security update for the Linux Kernel (Live Patch 4 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0869-1 Security update for the Linux Kernel (Live Patch 10 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0060-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026