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Unscored CVE-2025-37929 EUVD-2025-15920GHSA-76f4-m3p8-6hm8

arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays

Published May 20, 2025 · Updated May 23, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.14 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.19 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.14 Package: linux-oem-6.5 Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.5 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.5 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays

Commit a5951389e58d ("arm64: errata: Add newer ARM cores to the
spectre_bhb_loop_affected() lists") added some additional CPUs to the
Spectre-BHB workaround, including some new arrays for designs that
require new 'k' values for the workaround to be effective.

Unfortunately, the new arrays omitted the sentinel entry and so
is_midr_in_range_list() will walk off the end when it doesn't find a
match. With UBSAN enabled, this leads to a crash during boot when
is_midr_in_range_list() is inlined (which was more common prior to
c8c2647e69be ("arm64: Make  _midr_in_range_list() an exported
function")):

| Internal error: aarch64 BRK: 00000000f2000001 [#1] PREEMPT SMP
| pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
| pc : spectre_bhb_loop_affected+0x28/0x30
| lr : is_spectre_bhb_affected+0x170/0x190
| [...]
| Call trace:
| spectre_bhb_loop_affected+0x28/0x30
| update_cpu_capabilities+0xc0/0x184
| init_cpu_features+0x188/0x1a4
| cpuinfo_store_boot_cpu+0x4c/0x60
| smp_prepare_boot_cpu+0x38/0x54
| start_kernel+0x8c/0x478
| __primary_switched+0xc8/0xd4
| Code: 6b09011f 54000061 52801080 d65f03c0 (d4200020)
| ---[ end trace 0000000000000000 ]---
| Kernel panic - not syncing: aarch64 BRK: Fatal exception

Add the missing sentinel entries.

Affected products

VendorProductAffectedFixed
Linux Linux 6.13.12 – < 6.14, 5.15.181 – < 5.15.182, 6.1.135 – < 6.1.138, 6.6.88 – < 6.6.90, 6.12.24 – < 6.12.28, 6.14.3 – < 6.14.6 6.14

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 ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 6.12.29-1 —
Debian 13 linux 6.12.29-1 —
Debian 12 linux 6.1.140-1 DSA-5925-1
Debian 11 linux-6.1 6.1.140-1~deb11u1 DLA-4271-1

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 25.04 linux 6.14.0-24.24 USN-7649-1
Ubuntu 25.04 linux-aws +2 6.14.0-1009.9 USN-7665-1, USN-7649-2, USN-7649-1
Ubuntu 25.04 linux-azure 6.14.0-1010.10 USN-7721-1
Ubuntu 25.04 linux-gcp 6.14.0-1011.11 USN-7649-1
Ubuntu 25.04 linux-realtime 6.14.0-1006.6 USN-7649-1
Ubuntu 24.04 LTS linux-aws-6.14 +1 6.14.0-1009.9~24.04.1 USN-7665-2
Ubuntu 24.04 LTS linux-gcp-6.14 6.14.0-1011.11~24.04.1 —
Ubuntu 24.04 LTS linux-oem-6.14 6.14.0-1007.7 USN-7650-1
Ubuntu 24.04 LTS linux-realtime +1 No fix yet —
Ubuntu 24.04 LTS linux-riscv-6.14 6.14.0-24.24.1~24.04.1 —
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 6.14.0-1010.10~24.04.1 —

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.6.1 SUSE-SU-2025:02307-1
SLES 15 SP7 kernel-azure +2 6.4.0-150700.20.6.1 SUSE-SU-2025:02254-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.6.1.150700.17.6.1 SUSE-SU-2025:02307-1
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.53.1 SUSE-SU-2025:02000-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.40.1 SUSE-SU-2025:01965-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.28.coco15sp6.1 SUSE-SU-2025:02923-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.53.1.150600.12.24.1 SUSE-SU-2025:02000-1
Show 6 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.1 kernel-default-base 6.4.0-30.1.21.8 SUSE-SU-2025:20419-1
SLE Micro 6.1 kernel-rt +1 6.4.0-33.1 SUSE-SU-2025:20421-1
SLE Micro 6.1 kernel-source +2 6.4.0-30.1 SUSE-SU-2025:20419-1
SLE Micro 6.0 kernel-default-base 6.4.0-30.1.21.8 SUSE-SU-2025:20408-1
SLE Micro 6.0 kernel-rt +1 6.4.0-33.1 SUSE-SU-2025:20413-1
SLE Micro 6.0 kernel-source +2 6.4.0-30.1 SUSE-SU-2025:20408-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.6.1 SUSE-SU-2025:02307-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_2 1-150700.1.5.1 SUSE-SU-2025:02333-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_2 1-150700.15.3.1 SUSE-SU-2025:02307-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.53.1 SUSE-SU-2025:02000-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_11 1-150600.1.3.2 SUSE-SU-2025:01964-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_12 1-150600.13.3.1 SUSE-SU-2025:02000-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.8.1 SUSE-SU-2025:02333-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.39.1 SUSE-SU-2025:01964-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +10 6.4.0-150600.23.53.1 SUSE-SU-2025:02000-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.40.1 SUSE-SU-2025:01965-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.53.1.150600.12.24.1 SUSE-SU-2025:02000-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.39.1 SUSE-SU-2025:01964-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 bpftool +14 6.12.29-33.102.amzn2023 ALAS2023-2025-994
Amazon Linux 2023 kernel-livepatch-6.12.29-33.102 1.0-0.amzn2023 ALAS2023-2025-994

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 kernel-uek +34 6.12.0-101.33.4.3.el10uek ELSA-2026-50232, ELSA-2026-50160, ELSA-2025-20530
Oracle Linux 8 bpftool +18 5.15.0-310.184.5.2.el9uek ELSA-2025-20470

Advisories 26

References