Vulnerability-Lookup

GHSA-78H9-C595-34HG

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

net: devmem: prevent net-iov / page mixing

We should either have net_iov or page backed frags in a single skb, otherwise it blows up down the stack. Don't allow mixing in zerocopy_fill_skb_from_devmem().

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74627"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:35Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: prevent net-iov / page mixing\n\nWe should either have net_iov or page backed frags in a single skb,\notherwise it blows up down the stack. Don\u0027t allow mixing in\nzerocopy_fill_skb_from_devmem().",
  "id": "GHSA-78h9-c595-34hg",
  "modified": "2026-08-25T06:31:23Z",
  "published": "2026-08-22T18:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74627"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53a43508ee332d8bffe40590c3d189c92a551f9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9bfe12b1d04c34c6fedcba21d9709b65c08aa33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed08011ae0be88f16cceae190535d6c790c83b0c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74627 (GCVE-0-2026-74627)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:40

Title

net: devmem: prevent net-iov / page mixing

Summary

In the Linux kernel, the following vulnerability has been resolved: net: devmem: prevent net-iov / page mixing We should either have net_iov or page backed frags in a single skb, otherwise it blows up down the stack. Don't allow mixing in zerocopy_fill_skb_from_devmem().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e9bfe12b1d04c34c6…
https://git.kernel.org/stable/c/ed08011ae0be88f16…
https://git.kernel.org/stable/c/53a43508ee332d8bf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bd61848900bff597764238f3a8ec67c815cd316e , < e9bfe12b1d04c34c6fedcba21d9709b65c08aa33 (git) Affected: bd61848900bff597764238f3a8ec67c815cd316e , < ed08011ae0be88f16cceae190535d6c790c83b0c (git) Affected: bd61848900bff597764238f3a8ec67c815cd316e , < 53a43508ee332d8bffe40590c3d189c92a551f9f (git)
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/datagram.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9bfe12b1d04c34c6fedcba21d9709b65c08aa33",
              "status": "affected",
              "version": "bd61848900bff597764238f3a8ec67c815cd316e",
              "versionType": "git"
            },
            {
              "lessThan": "ed08011ae0be88f16cceae190535d6c790c83b0c",
              "status": "affected",
              "version": "bd61848900bff597764238f3a8ec67c815cd316e",
              "versionType": "git"
            },
            {
              "lessThan": "53a43508ee332d8bffe40590c3d189c92a551f9f",
              "status": "affected",
              "version": "bd61848900bff597764238f3a8ec67c815cd316e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/datagram.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: prevent net-iov / page mixing\n\nWe should either have net_iov or page backed frags in a single skb,\notherwise it blows up down the stack. Don\u0027t allow mixing in\nzerocopy_fill_skb_from_devmem()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in zerocopy_fill_skb_from_devmem() reached only via local sendmsg() on TCP sockets (tcp_sendmsg_locked -\u003e skb_zerocopy_iter_stream -\u003e __zerocopy_sg_from_iter); remote peers cannot invoke this skb construction path without local process cooperation.\nAC:L - An attacker reliably triggers mixing by partially filling the TCP write-queue tail skb with page-backed zerocopy or copy data, then issuing MSG_ZEROCOPY+SCM_DEVMEM_DMABUF sendmsg on the same skb; no race or uncontrollable layout is required.\nPR:L - Exploitation requires SOCK_ZEROCOPY, netdev-genl NETDEV_CMD_BIND_TX dmabuf binding, and a netmem_tx-capable NIC; CAP_NET_ADMIN for netdev/dmabuf setup is obtainable inside user/network namespaces via unshare without init-namespace root.\nUI:N - No victim file open, mount, or interactive action is needed; the attacker configures devmem TX binding and drives the crafted sendmsg sequence on their own TCP socket.\nS:U - Impact is kernel frag-type confusion and faults during local TX processing on the same host; it does not cross VM, container, or IOMMU security boundaries to a different authority.\nC:H - Mixing page-backed and net_iov frags violates skb unreadability invariants; downstream frag walkers that assume uniform backing can dereference invalid pages via skb_frag_foreach_page, enabling kernel memory disclosure primitives.\nI:H - Creating an skb with both page and net_iov fragments is explicit frag-type confusion; the stack cannot safely manage mixed backing types, and corrupted skb metadata/refcounts can be leveraged for arbitrary kernel writes or control-flow hijacking.\nA:H - The fix commit states mixed frags blow up down the stack; malformed skbs reaching TX, checksum, GSO, or frag-unref paths can trigger kernel oops/panic on netmem_tx deployments (cloud/HPC mlx5, bnxt, gve hosts)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:50.784Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e9bfe12b1d04c34c6fedcba21d9709b65c08aa33"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed08011ae0be88f16cceae190535d6c790c83b0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/53a43508ee332d8bffe40590c3d189c92a551f9f"
        }
      ],
      "title": "net: devmem: prevent net-iov / page mixing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74627",
    "datePublished": "2026-08-22T15:32:09.405Z",
    "dateReserved": "2026-08-15T05:44:03.921Z",
    "dateUpdated": "2026-08-25T05:40:50.784Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-78H9-C595-34HG

CVE-2026-74627 (GCVE-0-2026-74627)

Tags

Sightings

Nomenclature