CVE-2025-37929 (GCVE-0-2025-37929)

Vulnerability from cvelistv5 – Published: 2025-05-20 15:21 – Updated: 2026-05-23 15:58
VLAI
Title
arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4a2f3d8260a996bc43dcc1ce49ac594db54f4b3e , < e68da90ac00d8b681561aeb8f5d6c47af3a04861 (git)
Affected: 46e22de65eb45a67a68ddfe9301f79b0c3821ca8 , < 6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3 (git)
Affected: a53b3599d9bf9375f9033f2aa1fa92714fb1d0f0 , < 446289b8b36b2ee98dabf6388acbddcc33ed41be (git)
Affected: 4117975672c4743cffaf32b6fd018cfacd1b420e , < 3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c (git)
Affected: 9ca4fe357464bbdad0db67985275f2694df8dab5 , < 090c8714efe1c3c470301cc2f794c1ee2a57746c (git)
Affected: e060dbb7393ed7bdfba6b5ea7566f9ef87381cfb , < 333579202f09e260e8116321df4c55f80a19b160 (git)
Affected: a5951389e58d2e816eed3dbec5877de9327fd881 , < fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72 (git)
Affected: ed681e90fb244aa883b918c4d8be2614e816c6df (git)
Affected: 6.13.12 , < 6.14 (semver)
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Linux Linux Affected: 5.15.181 , < 5.15.182 (semver)
Affected: 6.1.135 , < 6.1.138 (semver)
Affected: 6.6.88 , < 6.6.90 (semver)
Affected: 6.12.24 , < 6.12.28 (semver)
Affected: 6.14.3 , < 6.14.6 (semver)
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: errata: A\u00f1adir centinelas faltantes a las matrices MIDR de Spectre-BHB. El commit a5951389e58d (\"arm64: errata: A\u00f1adir nuevos n\u00facleos ARM a las listas spectre_bhb_loop_affected()\") a\u00f1adi\u00f3 CPU adicionales a la soluci\u00f3n alternativa de Spectre-BHB, incluyendo nuevas matrices para dise\u00f1os que requieren nuevos valores \u0027k\u0027 para que la soluci\u00f3n sea efectiva. Desafortunadamente, las nuevas matrices omitieron la entrada de centinela, por lo que is_midr_in_range_list() se desviar\u00e1 al final si no encuentra una coincidencia. Con UBSAN habilitado, esto provoca un fallo durante el arranque cuando is_midr_in_range_list() est\u00e1 en l\u00ednea (lo cual era m\u00e1s com\u00fan antes de c8c2647e69be (\"arm64: Convertir _midr_in_range_list() en una funci\u00f3n exportada\")): | Error interno: 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 | [...] | Rastreo de llamadas: | 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 | C\u00f3digo: 6b09011f 54000061 52801080 d65f03c0 (d4200020) | ---[ fin del seguimiento 000000000000000 ]--- | P\u00e1nico del kernel - no sincroniza: aarch64 BRK: Excepci\u00f3n fatal Agregue las entradas centinela faltantes."
          }
        ],
        "id": "CVE-2025-37929",
        "lastModified": "2026-06-17T09:15:43.090",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-20T16:15:29.483",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/090c8714efe1c3c470301cc2f794c1ee2a57746c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/333579202f09e260e8116321df4c55f80a19b160"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3821cae9bd5a99a42d3d0be1b58e41f072cd4c4c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/446289b8b36b2ee98dabf6388acbddcc33ed41be"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6266b3509b2c6ebf2f9daf2239ff8eb60c5f5bd3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e68da90ac00d8b681561aeb8f5d6c47af3a04861"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fee4d171451c1ad9e8aaf65fc0ab7d143a33bd72"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:25:15+00:00",
      "cve": "CVE-2025-37929",
      "id": "CVE-2025-37929",
      "initial_release_date": "2025-05-20T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arm64: errata: Add missing sentinels to Spectre-BHB MIDR arrays",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37929.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T16:50:31Z",
      "cve": "CVE-2025-37929",
      "id": "CVE-2025-37929",
      "initial_release_date": "2025-05-21T00:46:54Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "427",
      "product_status:recommended": "396",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-37929",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-37929.json",
      "version": "47"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.