Description
The spectre_v2_select_mitigation function in arch/x86/kernel/cpu/bugs.c in the Linux kernel before 4.18.1 does not always fill RSB upon a context switch, which makes it easier for attackers to conduct userspace-userspace spectreRSB attacks.
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 | 4.17.15-1 | — |
| Debian 13 | linux | 4.17.15-1 | — |
| Debian 12 | linux | 4.17.15-1 | — |
| 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 18.04 LTS | linux | 4.15.0-36.39 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-aws +1 | 4.15.0-1023.23 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1025.26 | USN-3777-3 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1021.22 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1021.24 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1024.26 | USN-3777-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-137.163 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1069.79 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1025.26~16.04.1 | USN-3777-3 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1021.22~16.04.1 | USN-3777-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-36.39~16.04.1 | USN-3777-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1035.41 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1098.106 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1102.107 | USN-3776-1 |
| Ubuntu 14.04 LTS | linux | 3.13.0-160.210 | USN-3775-1 |
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1031.34 | USN-3776-2 |
| Ubuntu 14.04 LTS | linux-azure | 4.15.0-1030.31~14.04.1 | — |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-137.163~14.04.1 | USN-3776-2 |
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 | 4.12.14-25.16.1 | SUSE-SU-2018:2539-1 |
| SLES 15 | lttng-modules | 2.10.0-5.6.1 | SUSE-SU-2018:2539-1 |
| SLES 12 SP3 | kernel-azure +3 | 4.4.155-4.16.1 | SUSE-SU-2018:2858-1 |
| SLES 12 SP3 | kernel-docs +4 | 4.4.155-94.50.1 | SUSE-SU-2018:2776-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SLES 12 SP2 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_33 | 1-2.3.1 | SUSE-SU-2019:1289-1 |
| SLES 12 SP1 | lttng-modules | 2.7.0-4.4.1 | SUSE-SU-2019:1289-1 |
| SLES 12 | kernel-ec2 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | kernel-ec2 +9 | 3.0.101-108.71.1 | SUSE-SU-2018:2879-1 |
| SLES 11 SP3 | kernel-ec2 +7 | 3.0.101-0.47.106.50.1 | SUSE-SU-2018:2907-1 |
| SLES for SAP 12 SP3 | kernel-azure +2 | 4.4.155-4.16.1 | SUSE-SU-2018:2858-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.155-94.50.1 | SUSE-SU-2018:2776-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SLES for SAP 12 SP2 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_33 | 1-2.3.1 | SUSE-SU-2019:1289-1 |
| SLES for SAP 12 SP1 | lttng-modules | 2.7.0-4.4.1 | SUSE-SU-2019:1289-1 |
| SLES for SAP 11 SP4 | kernel-ec2 +8 | 3.0.101-108.71.1 | SUSE-SU-2018:2879-1 |
| SLE Real Time 12 SP3 | kernel-rt +3 | 4.4.155-3.23.1 | SUSE-SU-2018:2862-1 |
| SLE Real Time 11 SP4 | kernel-rt +3 | 3.0.101.rt130-69.36.1 | SUSE-SU-2018:3088-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-25.16.1 | SUSE-SU-2018:2538-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_4 | 1-1.3.1 | SUSE-SU-2018:2538-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_17 | 1-4.3.1 | SUSE-SU-2018:2775-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SUSE OpenStack Cloud 7 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | kernel-ec2 +6 | 3.0.101-0.47.106.50.1 | SUSE-SU-2018:2907-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SUSE Enterprise Storage 4 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.20.7.el7uek | ELSA-2018-4270, ELSA-2018-4261 |
| Oracle Linux 7 | perf +5 | 4.14.35-1818.4.5.el7uek | ELSA-2018-4270 |
Advisories 24
- WID-SEC-2026-3896 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 13, 2026
- USN-3777-3 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3777-1 linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3776-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3775-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 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
- USN-3777-2 linux-hwe, linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3776-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:2907-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2775-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3084-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1289-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3088-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2539-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2879-1 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-2018:2858-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2776-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2862-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2018:2538-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2018-4270 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 8, 2018
- ELSA-2018-4261 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 24, 2018
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fdf82a7856b32d905c39afc85e34364491e46346
- USN-3776-1 vendor-advisory
- USN-3776-2 vendor-advisory
- USN-3777-1 vendor-advisory
- https://github.com/torvalds/linux/commit/fdf82a7856b32d905c39afc85e34364491e46346
- USN-3775-1 vendor-advisory
- [debian-lts-announce] 20181003 [SECURITY] [DLA 1531-1] linux-4.9 security update mailing-list
- DSA-4308 vendor-advisory
- USN-3775-2 vendor-advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1
- USN-3777-2 vendor-advisory
- USN-3777-3 vendor-advisory