Description
The acpi_ns_evaluate() function in drivers/acpi/acpica/nseval.c in the Linux kernel through 4.12.9 does not flush the operand cache and causes a kernel stack dump, which allows local users to obtain sensitive information from kernel memory and bypass the KASLR protection mechanism (in the kernel through 4.9) via a crafted ACPI table.
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 | acpica-unix | 20180209-1 | — |
| Debian 14 | linux | 4.17.3-1 | — |
| Debian 13 | acpica-unix | 20180209-1 | — |
| Debian 13 | linux | 4.17.3-1 | — |
| Debian 12 | acpica-unix | 20180209-1 | — |
| Debian 12 | linux | 4.17.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | 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 | 4.15.0-34.37 | USN-3762-1 |
| Ubuntu 18.04 LTS | linux-aws +1 | 4.15.0-1021.21 | USN-3762-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1023.24 | USN-3762-1 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1019.20 | USN-3762-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1018.21 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1022.24 | USN-3762-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1053.57 | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-130.156 | USN-3696-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1062.71 | USN-3696-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1023.24~16.04.1 | USN-3762-2 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1019.20~16.04.1 | USN-3762-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-34.37~16.04.1 | USN-3762-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1029.34 | USN-3696-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1092.100 | USN-3696-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1095.100 | USN-3696-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1024.25 | USN-3696-2 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-130.156~14.04.1 | USN-3696-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1008.10 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150000.150.92.2 | SUSE-SU-2022:2103-1 |
| SLES 12 SP3 | kernel-default | 4.4.180-94.164.3 | SUSE-SU-2022:2082-1 |
| SLES 12 SP3 | kernel-syms +1 | 4.4.180-94.164.2 | SUSE-SU-2022:2082-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_45 | 1-4.3.2 | SUSE-SU-2022:2082-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.175.2 | SUSE-SU-2022:2077-1 |
| SLES 11 SP4 | kernel-ec2 +5 | 3.0.101-108.138.1 | SUSE-SU-2023:0416-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | kernel-docs +4 | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150000.150.92.2 | SUSE-SU-2022:2103-1 |
| SLES for SAP 12 SP3 | kernel-default | 4.4.180-94.164.3 | SUSE-SU-2022:2082-1 |
| SLES for SAP 12 SP3 | kernel-syms +1 | 4.4.180-94.164.2 | SUSE-SU-2022:2082-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_45 | 1-4.3.2 | SUSE-SU-2022:2082-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_31 | 1-150100.3.3.2 | SUSE-SU-2022:2111-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150000.150.92.2 | SUSE-SU-2022:2103-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_30 | 1-150000.1.3.2 | SUSE-SU-2022:2103-1 |
| SLE HPC 15 SP1 | kernel-docs +4 | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150000.150.92.2 | SUSE-SU-2022:2103-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-default | 4.4.180-94.164.3 | SUSE-SU-2022:2082-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +1 | 4.4.180-94.164.2 | SUSE-SU-2022:2082-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_45 | 1-4.3.2 | SUSE-SU-2022:2082-1 |
| SUSE OpenStack Cloud 8 | kernel-default | 4.4.180-94.164.3 | SUSE-SU-2022:2082-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +1 | 4.4.180-94.164.2 | SUSE-SU-2022:2082-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_45 | 1-4.3.2 | SUSE-SU-2022:2082-1 |
| SUSE HPE Helion OpenStack 8 | kernel-default | 4.4.180-94.164.3 | SUSE-SU-2022:2082-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +1 | 4.4.180-94.164.2 | SUSE-SU-2022:2082-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_45 | 1-4.3.2 | SUSE-SU-2022:2082-1 |
| SUSE Enterprise Storage 6 | kernel-docs +4 | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | kernel-debug +4 | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-150100.197.114.2 | SUSE-SU-2022:2111-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.25.1.el6uek | 0.4.5-3.el6 | ELSA-2018-4245 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.25.1.el7uek | 0.4.5-3.el7 | ELSA-2018-4245 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.25.1.el7uek | ELSA-2018-4245, ELSA-2018-4242, ELSA-2018-4227 |
| Oracle Linux 7 | perf +5 | 4.14.35-1818.3.3.el7uek | ELSA-2018-4242 |
Advisories 13
- USN-3762-1 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3696-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3762-2 linux-hwe, linux-azure, linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3696-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2022:2111-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2103-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2077-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2082-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0416-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0308 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 2, 2025
- ELSA-2018-4242 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 10, 2018
- ELSA-2018-4245 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 10, 2018
- ELSA-2018-4227 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 26, 2018
References
- USN-3696-1 vendor-advisory
- USN-3762-1 vendor-advisory
- 100497 vdb-entry
- USN-3762-2 vendor-advisory
- USN-3696-2 vendor-advisory
- https://github.com/acpica/acpica/pull/296/commits/37f2c716f2c6ab14c3ba557a539c3ee3224931b5
- https://patchwork.kernel.org/patch/9850567/