Description
A known cache speculation vulnerability, known as Branch History Injection (BHI) or Spectre-BHB, becomes actual again for the new hw AmpereOne. Spectre-BHB is similar to Spectre v2, except that malicious code uses the shared branch history (stored in the CPU Branch History Buffer, or BHB) to influence mispredicted branches within the victim's hardware context. Once that occurs, speculation caused by the mispredicted branches can cause cache allocation. This issue leads to obtaining information that should not be accessible.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Kernel | Linux Kernel 6.1-rc1 | — |
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 | 6.0.7-1 | — |
| Debian 13 | linux | 6.0.7-1 | — |
| Debian 12 | linux | 6.0.7-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1014.16 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-60.66 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1030.34 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1033.40 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1033.40.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1029.36 | — |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1027.32 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1015.19 | — |
| Ubuntu 22.04 LTS | linux-hwe-5.19 | 5.19.0-32.33~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1025.28 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1025.30 | — |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1028.33 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1017.17 | — |
| Ubuntu 22.04 LTS | linux-oem-6.0 | 6.0.0-1008.8 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1029.35 | — |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1024.26 | — |
| Ubuntu 22.04 LTS | linux-riscv +9 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-169.187 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1116.126 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1030.34~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1121.128 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1033.40~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1076.82 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1120.129 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1029.36~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +25 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1027.32~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1083.87 | USN-6548-4 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1015.19~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-60.66~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1063.68 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1025.30~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1028.29 | USN-6548-5 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1104.111 | USN-6548-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1115.124 | USN-6548-3 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1029.35~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1100.112 | USN-6548-2 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1029.33~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1035.39 | USN-6548-1 |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2105.111 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2084.90 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1121.132 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2068.73 | — |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-223.235 | USN-6701-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1166.179 | USN-6701-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1116.126~18.04.1 | USN-6548-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1175.190 | USN-6701-3 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1121.128~18.04.1 | USN-6548-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1160.177 | USN-6701-2 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1120.129~18.04.1 | USN-6548-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-169.187~18.04.1 | USN-6548-1 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1063.68~18.04.1 | USN-6548-1 |
| Ubuntu Pro 18.04 LTS | linux-kvm | 4.15.0-1150.155 | USN-6701-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1129.140 | USN-6701-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1115.124~18.04.1 | USN-6548-2 |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1100.112~18.04.1 | USN-6548-2 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1166.179~16.04.1 | USN-6701-3 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1175.190~16.04.1 | USN-6701-3 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1160.177~16.04.1 | USN-6701-2 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-223.235~16.04.1 | USN-6701-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1129.140~16.04.1 | USN-6701-3 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1175.190~14.04.1 | USN-6701-4 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhev Hypervisor 4 | perf +2 | 4.18.0-372.105.1.el8_6 | RHSA-2024:3462 |
| RHEL 8.6 EUS | perf +26 | 4.18.0-372.105.1.el8_6 | RHSA-2024:3462 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.7.1 | SUSE-SU-2023:2871-1 |
| SLES 15 SP5 | kernel-azure +2 | 5.14.21-150500.33.3.1 | SUSE-SU-2023:2646-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.7.1.150500.6.2.5 | SUSE-SU-2023:2871-1 |
| SLES 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.66.1 | SUSE-SU-2023:2653-1 |
| SLES 15 SP4 | kernel-azure +2 | 5.14.21-150400.14.52.1 | SUSE-SU-2023:2500-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.66.1.150400.24.29.1 | SUSE-SU-2023:2653-1 |
| SLES 15 SP4 | kernel-docs | 5.14.21-150400.24.66.2 | SUSE-SU-2023:2653-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.66.1 | SUSE-SU-2023:2653-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.66.1.150400.24.29.1 | SUSE-SU-2023:2653-1 |
| SLE Micro 5.4 | kernel-rt | 5.14.21-150400.15.37.2 | SUSE-SU-2023:2782-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.66.1 | SUSE-SU-2023:2653-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.66.1.150400.24.29.1 | SUSE-SU-2023:2653-1 |
| SLE Micro 5.3 | kernel-rt | 5.14.21-150400.15.37.2 | SUSE-SU-2023:2782-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.7.1 | SUSE-SU-2023:2871-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5-RT_Update_1 | 1-150500.11.5.1 | SUSE-SU-2023:2809-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_1 | 1-150500.11.7.1 | SUSE-SU-2023:2871-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.66.1 | SUSE-SU-2023:2653-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_8 | 1-150400.1.9.2 | SUSE-SU-2023:2782-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_13 | 1-150400.9.3.1 | SUSE-SU-2023:2653-1 |
| SUSE Real Time Module 15 SP5 | kernel-rt +3 | 5.14.21-150500.13.5.1 | SUSE-SU-2023:2809-1 |
| SUSE Real Time Module 15 SP4 | kernel-rt +1 | 5.14.21-150400.15.37.2 | SUSE-SU-2023:2782-1 |
| SUSE Real Time Module 15 SP4 | kernel-syms-rt +1 | 5.14.21-150400.15.37.1 | SUSE-SU-2023:2782-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.5 | dtb-aarch64 +10 | 5.14.21-150500.55.7.1 | SUSE-SU-2023:2871-1 |
| openSUSE Leap 15.5 | kernel-azure +2 | 5.14.21-150500.33.3.1 | SUSE-SU-2023:2646-1 |
| openSUSE Leap 15.5 | kernel-default-base | 5.14.21-150500.55.7.1.150500.6.2.5 | SUSE-SU-2023:2871-1 |
| openSUSE Leap 15.5 | kernel-rt +3 | 5.14.21-150500.13.5.1 | SUSE-SU-2023:2809-1 |
| openSUSE Leap 15.4 | dtb-aarch64 +9 | 5.14.21-150400.24.66.1 | SUSE-SU-2023:2653-1 |
| openSUSE Leap 15.4 | kernel-azure +2 | 5.14.21-150400.14.52.1 | SUSE-SU-2023:2500-1 |
| openSUSE Leap 15.4 | kernel-default-base | 5.14.21-150400.24.66.1.150400.24.29.1 | SUSE-SU-2023:2653-1 |
| openSUSE Leap 15.4 | kernel-docs | 5.14.21-150400.24.66.2 | SUSE-SU-2023:2653-1 |
| openSUSE Leap 15.4 | kernel-rt +1 | 5.14.21-150400.15.37.2 | SUSE-SU-2023:2782-1 |
| openSUSE Leap 15.4 | kernel-syms-rt +1 | 5.14.21-150400.15.37.1 | SUSE-SU-2023:2782-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | kernel-default | 5.14.21-150400.24.66.1 | SUSE-SU-2023:2653-1 |
| openSUSE Leap Micro 5.3 | kernel-default-base | 5.14.21-150400.24.66.1.150400.24.29.1 | SUSE-SU-2023:2653-1 |
| openSUSE Leap Micro 5.3 | kernel-rt | 5.14.21-150400.15.37.2 | SUSE-SU-2023:2782-1 |
Advisories 19
- USN-6701-2 linux-gcp, linux-gcp-4.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6701-3 linux-aws-hwe, linux-azure, linux-azure-4.15, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6701-4 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6548-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-bluefield, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6548-2 linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6548-3 linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6548-4 linux-gkeop vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6548-5 linux-iot vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6701-1 linux, linux-aws, linux-hwe, linux-kvm, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- RHSA-2024:3462 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- SUSE-SU-2023:2646-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2871-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2653-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2782-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2500-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2809-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1339 Linux Kernel: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · May 28, 2024
- ICSA-24-046-11 Siemens SCALANCE XCM-/XRM-300 CISA ICS & IT advisories · Feb 13, 2024
- SSA-806742 SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4 Siemens ProductCERT · Feb 13, 2024