Description
In the Linux kernel before 4.15, fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tree during read operations in DIRECT mode, which allows local users to cause a denial of service (BUG) by modifying a certain e_cpos field.
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 | 4.15.4-1 | — |
| Debian 13 | linux | 4.15.4-1 | — |
| Debian 12 | linux | 4.15.4-1 | — |
| Debian 9 | linux | 4.9.88-1 | DSA-4188-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1013.13~16.04.2 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1014.14~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-24.26~16.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | kernel-azure +2 | 4.12.14-5.16.1 | SUSE-SU-2018:3961-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-25.25.1 | SUSE-SU-2018:3589-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.3.1 | SUSE-SU-2018:3934-1 |
| SLES 12 SP4 | kernel-docs +3 | 4.12.14-95.3.1 | SUSE-SU-2018:4069-1 |
| SLES 12 SP4 | kernel-obs-build | 4.12.14-95.3.2 | SUSE-SU-2018:4069-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.3.1 | SUSE-SU-2018:3934-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.3.1 | SUSE-SU-2018:4069-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-25.25.1 | SUSE-SU-2018:3593-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_7 | 1-1.3.1 | SUSE-SU-2018:3593-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_1 | 1-7.1 | SUSE-SU-2018:4072-1 |
Advisories 8
- DSA-4188-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:3593-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3589-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3961-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:4072-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3934-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0532 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 11, 2025
- SUSE-SU-2018:4069-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025