GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:40
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd61848900bff597764238f3a8ec67c815cd316e , < e9bfe12b1d04c34c6fedcba21d9709b65c08aa33 (git)
Affected: bd61848900bff597764238f3a8ec67c815cd316e , < ed08011ae0be88f16cceae190535d6c790c83b0c (git)
Affected: bd61848900bff597764238f3a8ec67c815cd316e , < 53a43508ee332d8bffe40590c3d189c92a551f9f (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74627",
      "date": "2026-09-17",
      "epss": "0.00127",
      "percentile": "0.02728"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74627\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:35.630\",\"lastModified\":\"2026-08-25T06:18:41.313\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/datagram.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bd61848900bff597764238f3a8ec67c815cd316e\",\"lessThan\":\"e9bfe12b1d04c34c6fedcba21d9709b65c08aa33\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd61848900bff597764238f3a8ec67c815cd316e\",\"lessThan\":\"ed08011ae0be88f16cceae190535d6c790c83b0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd61848900bff597764238f3a8ec67c815cd316e\",\"lessThan\":\"53a43508ee332d8bffe40590c3d189c92a551f9f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/datagram.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/53a43508ee332d8bffe40590c3d189c92a551f9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9bfe12b1d04c34c6fedcba21d9709b65c08aa33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed08011ae0be88f16cceae190535d6c790c83b0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:51:32+00:00",
      "cve": "CVE-2026-74627",
      "id": "CVE-2026-74627",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: devmem: prevent net-iov / page mixing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74627.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:05:58Z",
      "cve": "CVE-2026-74627",
      "id": "CVE-2026-74627",
      "initial_release_date": "2026-09-03T00:05:58Z",
      "product_status:known_not_affected": "357",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74627",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74627.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.

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.


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.