Vulnerability-Lookup

GHSA-2VC2-FJ43-9QHC

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-27 15:31

Details

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

NTB: ntb_netdev: Preserve RX queue depth on allocation failure

ntb_netdev_rx_handler() hands the received skb to the network stack before allocating its replacement. If the allocation fails, nothing is reposted. Every failure therefore takes one buffer out of the RX queue while the interface remains up, and enough failures eventually stall reception.

A retry path could refill the queue later, but ntb_netdev has none. Allocate the replacement first instead. If that fails, drop the packet and repost the same skb. This keeps the queue full and lets packet delivery resume as soon as memory is available again.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74626"
  ],
  "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\nNTB: ntb_netdev: Preserve RX queue depth on allocation failure\n\nntb_netdev_rx_handler() hands the received skb to the network stack\nbefore allocating its replacement. If the allocation fails, nothing is\nreposted. Every failure therefore takes one buffer out of the RX queue\nwhile the interface remains up, and enough failures eventually stall\nreception.\n\nA retry path could refill the queue later, but ntb_netdev has none.\nAllocate the replacement first instead. If that fails, drop the packet\nand repost the same skb. This keeps the queue full and lets packet\ndelivery resume as soon as memory is available again.",
  "id": "GHSA-2vc2-fj43-9qhc",
  "modified": "2026-08-27T15:31:29Z",
  "published": "2026-08-22T18:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74626"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/272df0fbe6f3e04e22bc67fbdd9ac24586b942f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f2a15f33f86f7bd5b920669fd40c06725d72a1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d7f8a23c130d768c0976c2578b214353674e18f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/755fd7843f300d724caceabdf9bb13adc8701540"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4e340971fe8ccd245d206db4d43b2a0eec240bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2121faf133ac3bf9531b53a7e21273649a08517"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcaf8ba7e56bb73319ac107a63b907d59536192c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74626 (GCVE-0-2026-74626)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-27 12:39

Title

NTB: ntb_netdev: Preserve RX queue depth on allocation failure

Summary

In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_netdev: Preserve RX queue depth on allocation failure ntb_netdev_rx_handler() hands the received skb to the network stack before allocating its replacement. If the allocation fails, nothing is reposted. Every failure therefore takes one buffer out of the RX queue while the interface remains up, and enough failures eventually stall reception. A retry path could refill the queue later, but ntb_netdev has none. Allocate the replacement first instead. If that fails, drop the packet and repost the same skb. This keeps the queue full and lets packet delivery resume as soon as memory is available again.

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/6d7f8a23c130d768c…
https://git.kernel.org/stable/c/18781cc0bfb5c7f2a…
https://git.kernel.org/stable/c/272df0fbe6f3e04e2…
https://git.kernel.org/stable/c/fcaf8ba7e56bb7331…
https://git.kernel.org/stable/c/3f2a15f33f86f7bd5…
https://git.kernel.org/stable/c/a4e340971fe8ccd24…
https://git.kernel.org/stable/c/755fd7843f300d724…
https://git.kernel.org/stable/c/d2121faf133ac3bf9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 6d7f8a23c130d768c0976c2578b214353674e18f (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5 (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4 (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < fcaf8ba7e56bb73319ac107a63b907d59536192c (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 3f2a15f33f86f7bd5b920669fd40c06725d72a1e (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < a4e340971fe8ccd245d206db4d43b2a0eec240bd (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 755fd7843f300d724caceabdf9bb13adc8701540 (git) Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < d2121faf133ac3bf9531b53a7e21273649a08517 (git)
Linux	Linux	Affected: 3.9 Unaffected: 0 , < 3.9 (semver) Unaffected: 5.10.267 , ≤ 5.10.* (semver) Unaffected: 5.15.218 , ≤ 5.15.* (semver) Unaffected: 6.1.185 , ≤ 6.1.* (semver) Unaffected: 6.6.154 , ≤ 6.6.* (semver) Unaffected: 6.12.106 , ≤ 6.12.* (semver) Unaffected: 6.18.46 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ntb_netdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6d7f8a23c130d768c0976c2578b214353674e18f",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5",
              "status": "affected",
              "version": "548c237c0a9972df5d1afaca38aa733ee577128d",
              "versionType": "git"
            },
            {
              "lessThan": "272df0fbe6f3e04e22bc67fbdd9ac24586b942f4",
              "status": "affected",
              "version": "548c237c0a9972df5d1afaca38aa733ee577128d",
              "versionType": "git"
            },
            {
              "lessThan": "fcaf8ba7e56bb73319ac107a63b907d59536192c",
              "status": "affected",
              "version": "548c237c0a9972df5d1afaca38aa733ee577128d",
              "versionType": "git"
            },
            {
              "lessThan": "3f2a15f33f86f7bd5b920669fd40c06725d72a1e",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "a4e340971fe8ccd245d206db4d43b2a0eec240bd",
              "status": "affected",
              "version": "548c237c0a9972df5d1afaca38aa733ee577128d",
              "versionType": "git"
            },
            {
              "lessThan": "755fd7843f300d724caceabdf9bb13adc8701540",
              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
            }
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.9"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.267",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.106",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
              "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": [
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          "nodes": [
            {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                {
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                {
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                  "versionEndExcluding": "6.18.46",
                  "versionStartIncluding": "3.9",
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                },
                {
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                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_netdev: Preserve RX queue depth on allocation failure\n\nntb_netdev_rx_handler() hands the received skb to the network stack\nbefore allocating its replacement. If the allocation fails, nothing is\nreposted. Every failure therefore takes one buffer out of the RX queue\nwhile the interface remains up, and enough failures eventually stall\nreception.\n\nA retry path could refill the queue later, but ntb_netdev has none.\nAllocate the replacement first instead. If that fails, drop the packet\nand repost the same skb. This keeps the queue full and lets packet\ndelivery resume as soon as memory is available again."
        }
      ],
      "metrics": [
        {
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            "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"
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          "scenarios": [
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              "lang": "en",
              "value": "AV:N - The bug is triggered in ntb_netdev_rx_handler() on every Ethernet frame received on the NTB virtual netdev; in dual-controller storage and cluster deployments the NTB interconnect carries bridged or routed IP traffic, so a remote peer can deliver packets that reach this handler without local access to the victim.\nAC:L - An attacker can reliably trigger the failure by flooding the NTB link with packets while inducing GFP_ATOMIC allocation pressure through sustained traffic and/or local memory exhaustion; each failed netdev_alloc_skb permanently consumes one of the 100 RX slots with no recovery path until the interface is restarted.\nPR:N - Reception is driven by raw Ethernet frames from the NTB peer with no authentication, capability checks, or application-layer credentials on the receive path; any host that can send traffic over the established NTB link can reach ntb_netdev_rx_handler().\nUI:N - Exploitation requires only that the NTB netdev link already be up in its normal deployment configuration; no victim login, mount, file open, or other interactive action is needed beyond the attacker sending packets over the interconnect.\nS:U - The impact is permanent loss of receive capability on the NTB netdev within the same kernel security domain; it does not cross a VM, hypervisor, IOMMU, or other security-authority boundary.\nC:N - The defect only leaks RX queue entries on allocation failure and does not involve out-of-bounds access, use-after-free, or any memory read primitive that could disclose kernel data to the attacker.\nI:N - No kernel or user data is modified; the bug only fails to repost a receive buffer, causing progressive RX queue depletion rather than arbitrary memory writes or code execution.\nA:H - Each allocation failure permanently removes one RX buffer with no refill mechanism, and after NTB_RXQ_SIZE (100) failures reception on the NTB netdev stalls completely while the interface remains up, causing a persistent denial of service on a critical cluster interconnect until manual intervention."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T12:39:48.605Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6d7f8a23c130d768c0976c2578b214353674e18f"
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        },
        {
          "url": "https://git.kernel.org/stable/c/755fd7843f300d724caceabdf9bb13adc8701540"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2121faf133ac3bf9531b53a7e21273649a08517"
        }
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      "title": "NTB: ntb_netdev: Preserve RX queue depth on allocation failure",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74626",
    "datePublished": "2026-08-22T15:32:08.687Z",
    "dateReserved": "2026-08-15T05:44:03.921Z",
    "dateUpdated": "2026-08-27T12:39:48.605Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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