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CVE-2026-74741 (GCVE-0-2026-74741)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:36 – Updated: 2026-08-27 05:01
VLAI
Title
net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling In non-MSI-X mode (such as legacy INTx or single MSI), wx->msix_entry is not allocated or initialized. Calling NGBE_INTR_MISC(wx) dereferences wx->msix_entry->entry, leading to a NULL pointer dereference crash. This issue was introduced by fixing the IRQ vector when the number of VFs is 7. Fix the issue by explicitly checking `pdev->msix_enabled` to determine the correct vector index. Additionally, as a side fix, set the interrupt mask to BIT(0) for the non-MSI-X fallback. In MSI/INTx mode, the MISC and queue interrupts share vector 0, and the WX_PX_MISC_IVAR register is only valid in the MSI-X case. Thus, BIT(0) is the correct mask for the miscellaneous cause when MSI-X is disabled.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4174c0c331a2aa3322d3b3be532808deb041b37d , < cef4c5b9aca24651d069adf9462b221df6a2a669 (git)
Affected: 4174c0c331a2aa3322d3b3be532808deb041b37d , < 0ab482b2195edc000262f0eae1cdcb416b8f335d (git)
Affected: 4174c0c331a2aa3322d3b3be532808deb041b37d , < 5f3a13e0bb5ebcc1ca2dfda42ea40b9f3c2be6ea (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/wangxun/ngbe/ngbe_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "cef4c5b9aca24651d069adf9462b221df6a2a669",
              "status": "affected",
              "version": "4174c0c331a2aa3322d3b3be532808deb041b37d",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "4174c0c331a2aa3322d3b3be532808deb041b37d",
              "versionType": "git"
            },
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              "status": "affected",
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.16"
            },
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              "status": "unaffected",
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              "version": "6.18.46",
              "versionType": "semver"
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      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
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                },
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling\n\nIn non-MSI-X mode (such as legacy INTx or single MSI), wx-\u003emsix_entry is\nnot allocated or initialized. Calling NGBE_INTR_MISC(wx) dereferences\nwx-\u003emsix_entry-\u003eentry, leading to a NULL pointer dereference crash.\n\nThis issue was introduced by fixing the IRQ vector when the number of\nVFs is 7. Fix the issue by explicitly checking `pdev-\u003emsix_enabled` to\ndetermine the correct vector index.\n\nAdditionally, as a side fix, set the interrupt mask to BIT(0) for the\nnon-MSI-X fallback. In MSI/INTx mode, the MISC and queue interrupts\nshare vector 0, and the WX_PX_MISC_IVAR register is only valid in the\nMSI-X case. Thus, BIT(0) is the correct mask for the miscellaneous cause\nwhen MSI-X is disabled."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The NULL dereference is in ngbe_intr(), the MSI/INTx hard-IRQ handler reached when the Wangxun ngbe NIC raises an interrupt from wire activity (RX/TX completion, link, or misc events); a remote peer sending traffic to an up interface drives this path with no local access.\nAC:L - After the 4174c0c regression every non-MSI-X interrupt that reaches ngbe_irq_enable(wx,false) deterministically dereferences NULL msix_entry; MSI/INTx fallback is automatic on MSI-X allocation failure, VMs, and pci=nomsi, and each packet reliably retriggers the fault.\nPR:N - No credentials or capabilities are needed on the target once the netdev is up; received frames are handled in hardirq before any socket, netfilter, or authentication gate, so any host that can send packets to the interface can trigger the crash.\nUI:N - Interrupt delivery and the faulty re-enable run automatically in hardirq context on normal NIC operation; no administrator or end-user action beyond the interface already being configured up at boot is required.\nS:U - The oops is confined to kernel hardirq context within the same security authority; it is not a VM escape, hypervisor bypass, IOMMU violation, or sandbox boundary crossing.\nC:N - The fault is a NULL read of wx-\u003emsix_entry-\u003eentry while computing an interrupt mask; execution aborts immediately with no out-of-bounds read, use-after-free, or data returned to the attacker.\nI:N - This is a pure NULL pointer read, not memory corruption; no attacker-controlled write, heap spray, or control-flow hijack primitive exists before the kernel faults.\nA:H - The NULL dereference occurs in hardirq context and causes a kernel oops or panic, fully denying availability; on internet-facing servers with ngbe in MSI/INTx mode an unauthenticated remote attacker can repeat the crash on every interrupt."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:01:01.751Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cef4c5b9aca24651d069adf9462b221df6a2a669"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ab482b2195edc000262f0eae1cdcb416b8f335d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f3a13e0bb5ebcc1ca2dfda42ea40b9f3c2be6ea"
        }
      ],
      "title": "net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74741",
    "datePublished": "2026-08-26T14:36:52.937Z",
    "dateReserved": "2026-08-15T05:44:03.930Z",
    "dateUpdated": "2026-08-27T05:01:01.751Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74741",
      "date": "2026-09-16",
      "epss": "0.00451",
      "percentile": "0.38299"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T11:20:23+00:00",
      "cve": "CVE-2026-74741",
      "id": "CVE-2026-74741",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74741.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:05:39Z",
      "cve": "CVE-2026-74741",
      "id": "CVE-2026-74741",
      "initial_release_date": "2026-08-27T16:50:46Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74741",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74741.json",
      "version": "3"
    }
  }
}



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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.

Sightings

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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.