Vulnerability-Lookup

GHSA-485C-XRJ6-WVH4

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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

NTB: ntb_transport: Reject oversized TX buffers

ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it.

Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and return -EMSGSIZE. The caller retains ownership of the buffer, and the preceding netdev patch frees the skb when enqueue returns this permanent error.

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-2026-80987"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:05Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_transport: Reject oversized TX buffers\n\nntb_process_tx() handles an oversized buffer by calling tx_handler()\nwith a NULL data pointer and returning success. ntb_netdev therefore\nneither frees the skb in its completion callback nor takes its enqueue\nerror path, leaking it.\n\nReject oversized buffers in ntb_transport_tx_enqueue() before acquiring\na queue entry and return -EMSGSIZE. The caller retains ownership of the\nbuffer, and the preceding netdev patch frees the skb when enqueue\nreturns this permanent error.",
  "id": "GHSA-485c-xrj6-wvh4",
  "modified": "2026-09-14T15:32:22Z",
  "published": "2026-09-11T21:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80987"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4890152a3069f5cb58cc24b08cfd5fe95e568fa1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/668aa3238548584ca9772da9cf43ae8c2389bbf1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b0fa8a9e1057614a533cc3f18b17f82aab028d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88"
    }
  ],
  "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-2026-80987 (GCVE-0-2026-80987)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59

Title

NTB: ntb_transport: Reject oversized TX buffers

Summary

In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Reject oversized TX buffers ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it. Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and return -EMSGSIZE. The caller retains ownership of the buffer, and the preceding netdev patch frees the skb when enqueue returns this permanent error.

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/4890152a3069f5cb5…
https://git.kernel.org/stable/c/668aa3238548584ca…
https://git.kernel.org/stable/c/9b0fa8a9e1057614a…
https://git.kernel.org/stable/c/b6db88cde0fb5c3bd…
https://git.kernel.org/stable/c/a7f22105a7df8c7fd…
https://git.kernel.org/stable/c/6b6bbc6c878d64eac…
https://git.kernel.org/stable/c/75a604e9f1cfdebda…
https://git.kernel.org/stable/c/a4f2387db6f1cc2f0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < 4890152a3069f5cb58cc24b08cfd5fe95e568fa1 (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < 668aa3238548584ca9772da9cf43ae8c2389bbf1 (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < 9b0fa8a9e1057614a533cc3f18b17f82aab028d8 (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88 (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < a7f22105a7df8c7fd74d0af27ace6fa94fe03d87 (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0 (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < 75a604e9f1cfdebda421062fdf42225ca32154cd (git) Affected: fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 , < a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7 (git)
Linux	Linux	Affected: 3.9 Unaffected: 0 , < 3.9 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ntb/ntb_transport.c"
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              "status": "affected",
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            },
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              "version": "3.9"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.50",
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            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.3-rc1",
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        }
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_transport: Reject oversized TX buffers\n\nntb_process_tx() handles an oversized buffer by calling tx_handler()\nwith a NULL data pointer and returning success. ntb_netdev therefore\nneither frees the skb in its completion callback nor takes its enqueue\nerror path, leaking it.\n\nReject oversized buffers in ntb_transport_tx_enqueue() before acquiring\na queue entry and return -EMSGSIZE. The caller retains ownership of the\nbuffer, and the preceding netdev patch frees the skb when enqueue\nreturns this permanent error."
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              "value": "AV:N - ntb_transport_tx_enqueue() is reached from ntb_netdev_start_xmit() on the NTB virtual Ethernet device; in dual-controller/cluster deployments that interconnect carries routed or 802.1Q traffic, so a remote peer can induce full-MTU egress (software VLAN insertion adds VLAN_HLEN past the transport payload limit) without local access.\nAC:L - Any TX buffer longer than tx_max_frame minus the payload header deterministically takes the oversized path; VLAN devices default to the lowerdev MTU so tagged full-size frames always exceed the limit, and AF_PACKET allows MTU+VLAN_HLEN, with no race or uncontrolled layout.\nPR:N - The netdev TX path has no authentication or capability check; once the NTB link is up, any host exchanging traffic over the interconnect or a VLAN/service on it can cause oversized transmits without credentials on the victim.\nUI:N - Oversized frames are transmitted by the kernel networking stack during ordinary packet egress; no victim action such as mounting a device or opening a file is required.\nS:U - The defect leaks sk_buff memory on the transmitting host inside the same kernel authority; it is not a VM escape, IOMMU/DMA bypass, or corruption of the peer host over the NTB link.\nC:N - The oversized path never copies payload bytes and does not free or reuse the skb, so there is no out-of-bounds read, use-after-free, or other information-disclosure primitive.\nI:N - ntb_process_tx() refuses to DMA or memcpy an oversized buffer and only invokes the completion callback with a NULL pointer, so there is no out-of-bounds write, heap corruption, or control-flow hijacking.\nA:H - Enqueue returns success while the TX handler is called with a NULL skb and skips kfree, permanently leaking one sk_buff (and its pages/socket accounting) per oversized transmit; repeating this exhausts kernel memory and causes OOM denial of service."
            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:59:28.875Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7"
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      "title": "NTB: ntb_transport: Reject oversized TX buffers",
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    "cveId": "CVE-2026-80987",
    "datePublished": "2026-09-11T19:42:45.574Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-09-14T11:59:28.875Z",
    "state": "PUBLISHED"
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  "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.

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