Linux Kernel up to ed681e90fb244aa883b918c4d8be2614e816c6df arm64 spectre_bhb_loop_affected denial of service

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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to ed681e90fb244aa883b918c4d8be2614e816c6df. Affected is the function spectre_bhb_loop_affected of the component arm64. Such manipulation leads to denial of service. This vulnerability is traded as CVE-2025-37929. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to ed681e90fb244aa883b918c4d8be2614e816c6df and classified as critical. Affected by this issue is the function spectre_bhb_loop_affected of the component arm64. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-37929 since 04/16/2025. The exploitation is known to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 237223 (Debian dsa-5925 : affs-modules-6.1.0-33-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15-rc1 or 6.15-rc5 eliminates this vulnerability. Applying the patch 6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3/446289b8b36b2ee98dabf6388acbddcc33ed41be/3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c/090c8714efe1c3c470301cc2f794c1ee2a57746c/333579202f09e260e8116321df4c55f80a19b160/fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (237223) and CERT Bund (WID-SEC-2025-1114). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Dell Avamar
  • Open Source Linux Kernel
  • Dell NetWorker
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 237223
Nessus Name: Debian dsa-5925 : affs-modules-6.1.0-33-4kc-malta-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.15.182/6.1.138/6.6.90/6.12.28/6.14.6/6.15-rc1/6.15-rc5
Patch: 6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3/446289b8b36b2ee98dabf6388acbddcc33ed41be/3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c/090c8714efe1c3c470301cc2f794c1ee2a57746c/333579202f09e260e8116321df4c55f80a19b160/fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72

Timelineinfo

04/16/2025 🔍
05/20/2025 +34 days 🔍
05/20/2025 +0 days 🔍
12/14/2025 +208 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-37929 (🔍)
GCVE (CVE): GCVE-0-2025-37929
GCVE (VulDB): GCVE-100-309704
CERT Bund: WID-SEC-2025-1114 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/20/2025 17:58
Updated: 12/14/2025 15:26
Changes: 05/20/2025 17:58 (59), 05/25/2025 03:47 (2), 06/27/2025 13:56 (1), 08/10/2025 19:53 (7), 09/28/2025 02:20 (1), 11/11/2025 00:33 (11), 12/14/2025 15:26 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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