CVE-2026-77696 affecting package cloud-hypervisor 52.0.152-1

{
  "id": "a5b645af2eab55344c97e41621906cf05bbcb9957974adddc4a02965ae3440aa",
  "url": "https://osv.dev/vulnerability/AZL-105465",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-77696 affecting package cloud-hypervisor 52.0.152-1",
    "summary": "Issue summary: SM2 signature generation uses non-constant-time arithmetic on secret values, forming a timing side-channel. Impact summary: An attacker able to measure SM2 signing times may learn information about the per-signature secret nonce, which over many signatures can, via a lattice / Hidden Number Problem attack, lead to recovery of the private key. CWE: CWE-208: Observable Timing Discrepancy Description: SM2 signature generation computes the signature value using variable-time BIGNUM operations on the secret nonce and the private key, so the time taken to produce an SM2 signature depends on these secret values, forming a timing side-channel. Applications performing SM2 signature generation are affected on all platforms. FIPS Impact: no SM2 is not a FIPS algorithm.",
    "evidence": "osv:AZL-105465",
    "products": [
      {
        "name": {
          "value": "cloud-hypervisor",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-105465",
      "aliases": [
        "AZL-105465"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "52.0.152-1"
                }
              ]
            }
          ],
          "package": {
            "name": "cloud-hypervisor",
            "purl": "pkg:rpm/azure-linux/cloud-hypervisor",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-105465.json"
          }
        }
      ],
      "modified": "2026-10-15T05:37:09Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-77696"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-77696"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-77696",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 321313,
  "published_at": "2026-09-29T16:17:11+00:00"
}