CVE-2025-37929

MEDIUM EPSS 5.7%
Published May 20, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 20, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥6.1.135  –  <6.1.138
linuxlinux_kernel*≥6.6.88  –  <6.6.90
linuxlinux_kernel*≥6.12.24  –  <6.12.28
linuxlinux_kernel*≥6.13.12  –  <6.14
linuxlinux_kernel*≥6.14.3  –  <6.14.6
linuxlinux_kernel5.15.181any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
debiandebian_linux11.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/090c8714efe1c3c470301cc2f794c1ee2a57746c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/333579202f09e260e8116321df4c55f80a19b160
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/446289b8b36b2ee98dabf6388acbddcc33ed41be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e68da90ac00d8b681561aeb8f5d6c47af3a04861
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/090c8714efe1c3c470301cc2f794c1ee2a57746c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/333579202f09e260e8116321df4c55f80a19b160
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/446289b8b36b2ee98dabf6388acbddcc33ed41be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e68da90ac00d8b681561aeb8f5d6c47af3a04861
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72
    Patch