5.5

CVE-2025-37929: arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays

Analyzed
AliasesUBUNTU-CVE-2025-37929DEBIAN-CVE-2025-37929
Published 20-05-2025Last modified 23-05-2026

Vulnerability summary

CVE-2025-37929 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 10.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.20%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 21 · Related 17
DLA-4271-1DSA-5925-1MGASA-2025-0182MGASA-2025-0183SUSE-SU-2025:01964-1SUSE-SU-2025:01965-1

Timeline

  1. 20-05-2025
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.19% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu83 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 4a2f3d8260a996bc43dcc1ce49ac594db54f4b3e, < e68da90ac00d8b681561aeb8f5d6c47af3a04861 | ≥ 46e22de65eb45a67a68ddfe9301f79b0c3821ca8, < 6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3 | ≥ a53b3599d9bf9375f9033f2aa1fa92714fb1d0f0, < 446289b8b36b2ee98dabf6388acbddcc33ed41be | ≥ 4117975672c4743cffaf32b6fd018cfacd1b420e, < 3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c | ≥ 9ca4fe357464bbdad0db67985275f2694df8dab5, < 090c8714efe1c3c470301cc2f794c1ee2a57746c | ≥ e060dbb7393ed7bdfba6b5ea7566f9ef87381cfb, < 333579202f09e260e8116321df4c55f80a19b160 | ≥ a5951389e58d2e816eed3dbec5877de9327fd881, < fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72 | ed681e90fb244aa883b918c4d8be2614e816c6df | ≥ 6.13.12, < 6.14 | ≥ 5.15.181, < 5.15.182 | ≥ 6.1.135, < 6.1.138 | ≥ 6.6.88, < 6.6.90 | ≥ 6.12.24, < 6.12.28 | ≥ 6.14.3, < 6.14.6
  • linux_kernel≥ 6.1.135, < 6.1.138 | ≥ 6.6.88, < 6.6.90 | ≥ 6.12.24, < 6.12.28 | ≥ 6.13.12, < 6.14 | ≥ 6.14.3, < 6.14.6 | 5.15.181 | 6.15:rc1 | 6.15:rc2 | 6.15:rc3 | 6.15:rc4

3 vendors · 87 products

References

18 links
Show all 18 references