CVE-2026-64018 (GCVE-0-2026-64018)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38
VLAI
Title
net: mana: validate rx_req_idx to prevent out-of-bounds array access
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.
Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 5ddc715324badd7f2641bc177db1d027b402adae (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < ff1d5af207bcea857d45fe81505f1bc4b29eaef0 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 01f7f893d5e1baae995beeb86cd0f3e6bb2a3b01 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 763a372d344fb12fae566d36ddb46e92454ad58c (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < fa627a5eaa83fc0261f44ef3769693b886ca6e27 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 355e9f2b2a7887ca38100127989af3e422ba71d0 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < b809d0409991b75a6cff846a5ac27c3062953f84 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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        }
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            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:L - The bug is reached via MSI-driven hardware completion processing in the MANA HWC control path (not netdev packet receive), triggered when the Azure hypervisor/host tampers with guest-visible DMA-coherent WQE memory on the same physical compute node.\nAC:L - A malicious host or NIC firmware that can modify shared unencrypted DMA buffers controls both the forged sge-\u003eaddress and the timing of HWC RX completions, allowing reliable out-of-bounds indexing without winning a race or depending on guest state.\nPR:N - Exploitation requires no privileges on the victim guest VM; the attacker operates from the Azure hypervisor/host side by modifying DMA-coherent memory that the guest kernel trusts during HWC response handling.\nUI:N - No victim user action is required; exploitation occurs automatically when the driver processes a hardware completion event on the HWC receive queue.\nS:C - In Confidential VMs the guest relies on host isolation guarantees, but shared unencrypted DMA memory lets a hostile hypervisor cross that CVM security boundary to corrupt guest kernel memory and confidentiality.\nC:H - An out-of-bounds rx_req_idx yields a corrupted hwc_work_request whose buf_va is dereferenced and copied via memcpy in mana_hwc_handle_resp(), enabling arbitrary kernel memory disclosure.\nI:H - The out-of-bounds hwc_work_request supplies attacker-controlled pointers and SGE fields used to repost RX WQEs via mana_hwc_post_rx_wqe(), enabling kernel heap corruption and exploitable memory writes.\nA:H - Indexing reqs[] out of bounds with attacker-controlled values can dereference invalid kernel pointers and corrupt adjacent heap objects, causing kernel oops/panic and denial of service."
            }
          ]
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    "datePublished": "2026-07-19T15:39:12.704Z",
    "dateReserved": "2026-07-19T07:54:57.027Z",
    "dateUpdated": "2026-08-05T12:38:15.556Z",
    "state": "PUBLISHED"
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        "lastModified": "2026-07-30T14:59:47.950",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
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        "vulnStatus": "Awaiting Analysis"
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    "redhat_vex": {
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      "current_release_date": "2026-09-16T19:19:06+00:00",
      "cve": "CVE-2026-64018",
      "id": "CVE-2026-64018",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64018.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:44:41Z",
      "cve": "CVE-2026-64018",
      "id": "CVE-2026-64018",
      "initial_release_date": "2026-07-21T13:01:26Z",
      "product_status:first_fixed": "33",
      "product_status:known_affected": "579",
      "product_status:known_not_affected": "159",
      "product_status:recommended": "355",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64018",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64018.json",
      "version": "15"
    }
  }
}



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