arm64: errata: Add missing sentinels to Spectre-BHB MIDR arr… (CVE-2025-37929)

Summary

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

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.181"},{"fixed":"5.15.182"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.135"},{"fixed":"6.1.138"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.6.88"},{"fixed":"6.6.90"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.12.24"},{"fixed":"6.12.28"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.14.3"},{"fixed":"6.14.6"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2025-37929 linux-lts Fixed in: 6.1.140-r0
Debian DEBIAN-CVE-2025-37929 linux Fixed in: 6.1.140-1

Summary

Original description

Affected packages

Fix status by distribution

References