Description
In the Linux kernel, the following vulnerability has been resolved:
x86/speculation: Fill RSB on vmexit for IBRS
Prevent RSB underflow/poisoning attacks with RSB. While at it, add a
bunch of comments to attempt to document the current state of tribal
knowledge about RSB attacks and what exactly is being mitigated.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 4.14.14 – < 4.14.297, 3.2.101 – < 3.3, 3.16.56 – < 3.17, 4.4.113 – < 4.5, 4.9.77 – < 4.10, 4.15 | 4.14.297 |
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 | 5.18.14-1 | — |
| Debian 13 | linux | 5.18.14-1 | — |
| Debian 12 | linux | 5.18.14-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-46.49 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1017.21 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1017.20 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1016.21 | — |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1014.17 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1002.4 | — |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1012.14 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1013.17 | — |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1016.19 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1016.20 | — |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1013.15 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-132.148 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1089.97 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1017.21~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1095.101 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1017.20~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1050.56 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1093.102 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1016.21~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-46.49~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1037.42 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1015.20~20.04.2 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1006.8 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1079.85 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1087.96 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1016.20~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1074.85 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1017.19~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-204.215 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1150.163 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1089.97~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1161.176 | — |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1095.101~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1145.161 | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1093.102~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-132.148~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-ibm-5.4 | 5.4.0-1037.42~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1135.140 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1114.125 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1087.96~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1074.85~18.04.1 | — |
| 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 Realtime 22.04 LTS | linux-realtime | 5.15.0-1019.19 | — |
| 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 | 5.4.0-1089.97+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1095.101+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1065.74 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1093.102+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2089.95 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2070.76 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1107.118 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2054.59 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1090.97 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-242.276 | — |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1158.173 | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1151.164~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1162.177~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1146.162~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-206.217~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1121.131 | — |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1115.126~16.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1120.126 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1162.177~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-242.276~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | perf +26 | 4.18.0-372.32.1.el8_6 | RHSA-2022:7683, RHSA-2022:7110 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhev Hypervisor 4 | perf +2 | 4.18.0-372.32.1.el8_6 | RHSA-2022:7110 |
| RHEL 9.0 EUS | perf +29 | 5.14.0-70.36.1.el9_0 | RHSA-2022:8973 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLES 12 SP5 | kernel-syms +2 | 4.12.14-122.255.1 | SUSE-SU-2025:1293-1 |
Show 18 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLES for SAP 15 SP3 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLES for SAP 15 SP3 | kernel-docs +5 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.91.1 | SUSE-SU-2025:1176-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.115.1 | SUSE-SU-2025:1183-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.115.1 | SUSE-SU-2025:1183-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.2 | kernel-rt +1 | 5.3.18-150300.205.1 | SUSE-SU-2025:1194-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.1 | kernel-rt +1 | 5.3.18-150300.205.1 | SUSE-SU-2025:1194-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_25 | 1-150500.11.3.1 | SUSE-SU-2025:1241-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_38 | 1-150400.9.3.1 | SUSE-SU-2025:1027-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_56 | 1-150300.7.3.1 | SUSE-SU-2025:1263-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.255.1 | SUSE-SU-2025:1293-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_67 | 1-8.5.1 | SUSE-SU-2025:1293-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLE HPC 15 SP3 | kernel-64kb +6 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE HPC 15 SP3 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SUSE Manager Server 4.3 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SUSE Manager Server 4.3 | kernel-syms +3 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SUSE Manager Proxy 4.3 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SUSE Manager Proxy 4.3 | kernel-syms +2 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SUSE Enterprise Storage 7.1 | kernel-64kb +6 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SUSE Enterprise Storage 7.1 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.291-218.527 | 1.0-0.amzn2 | ALAS2-2022-1838 |
| Amazon Linux 2 | perf +8 | 4.14.291-218.527.amzn2 | ALAS2-2022-1838 |
Advisories 11
- RHSA-2022:7683 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2022:8973 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:7110 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 11, 2026
- SUSE-SU-2025:1194-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1176-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1241-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1027-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1183-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1293-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2022-1838 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 26, 2025
- SUSE-SU-2025:1263-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Apr 16, 2025
References
- https://git.kernel.org/stable/c/3d323b99ff5c8c57005184056d65f6af5b0479d8
- https://git.kernel.org/stable/c/f744b88dfc201bf8092833ec70b23c720188b527
- https://git.kernel.org/stable/c/17a9fc4a7b91f8599223631bb6ae6416bc0de1c0
- https://git.kernel.org/stable/c/4d7f72b6e1bc630bec7e4cd51814bc2b092bf153
- https://git.kernel.org/stable/c/8d5cff499a6d740c91ff37963907e0e983c37f0f
- https://git.kernel.org/stable/c/8c38306e2e9257af4af2819aa287a4711ff36329
- https://git.kernel.org/stable/c/9756bba28470722dacb79ffce554336dd1f6a6cd