3.2 KiB
CVE-2025-37929
Description
In the Linux kernel, the following vulnerability has been resolved:arm64: errata: Add missing sentinels to Spectre-BHB MIDR arraysCommit a5951389e58d ("arm64: errata: Add newer ARM cores to thespectre_bhb_loop_affected() lists") added some additional CPUs to theSpectre-BHB workaround, including some new arrays for designs thatrequire new 'k' values for the workaround to be effective.Unfortunately, the new arrays omitted the sentinel entry and sois_midr_in_range_list() will walk off the end when it doesn't find amatch. With UBSAN enabled, this leads to a crash during boot whenis_midr_in_range_list() is inlined (which was more common prior toc8c2647e69be ("arm64: Make _midr_in_range_list() an exportedfunction")): | 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 exceptionAdd the missing sentinel entries.
POC
Reference
No PoCs from references.