CVE-2025-37929

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux4a2f3d8260a996bc43dcc1ce49ac594db54f4b3e < e68da90ac00d8b681561aeb8f5d6c47af3a04861affected
LinuxLinux46e22de65eb45a67a68ddfe9301f79b0c3821ca8 < 6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3affected
LinuxLinuxa53b3599d9bf9375f9033f2aa1fa92714fb1d0f0 < 446289b8b36b2ee98dabf6388acbddcc33ed41beaffected
LinuxLinux4117975672c4743cffaf32b6fd018cfacd1b420e < 3821cae9bd5a99a42d3d0be1b58e41f072cd4c4caffected
LinuxLinux9ca4fe357464bbdad0db67985275f2694df8dab5 < 090c8714efe1c3c470301cc2f794c1ee2a57746caffected
LinuxLinuxe060dbb7393ed7bdfba6b5ea7566f9ef87381cfb < 333579202f09e260e8116321df4c55f80a19b160affected
LinuxLinuxa5951389e58d2e816eed3dbec5877de9327fd881 < fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72affected
LinuxLinuxed681e90fb244aa883b918c4d8be2614e816c6dfaffected
LinuxLinux6.13.12 < 6.14affected
LinuxLinux5.15.181 < 5.15.182affected
LinuxLinux6.1.135 < 6.1.138affected
LinuxLinux6.6.88 < 6.6.90affected
LinuxLinux6.12.24 < 6.12.28affected
LinuxLinux6.14.3 < 6.14.6affected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References