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CVE-2026-80988 (GCVE-0-2026-80988)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
VLAI
Title
NTB: ntb_transport: Fail TX enqueue when the QP link is down
Summary
In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Fail TX enqueue when the QP link is down Commit f195a1a6fe41 ("ntb: Drop packets when qp link is down") meant to make ntb_transport_tx_enqueue() drop packets submitted while the QP link is down, but it only returns 0 without consuming the packet. Zero means success by this function's contract, so ntb_netdev reports NETDEV_TX_OK and forgets the skb: nothing queued it, nothing frees it, and it leaks, one skb for every transmit racing a link-down. Return -ENOLINK instead, restoring the contract that a non-zero return leaves the buffer owned by the caller. With the preceding patch, ntb_netdev frees the skb on non-retryable enqueue failures and returns NETDEV_TX_OK, so a packet racing with link-down is dropped without leaking or entering a busy retry loop.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3cfdc448e8bfa8a7eaa5af87f357330566124b78 , < 76c9ccc0c6bebfc74c0e727eda67687f5103ab06 (git)
Affected: bfa051f650a7708183bd86901ca4645dcf88c486 , < 96d792c65b9d5f7f9dd86a1004315db59e450c07 (git)
Affected: 4f4af6b8b7a23fa37decaf43b55403e6bfd8e219 , < 45cc11035165918dd1f81796ea98f81ece20d361 (git)
Affected: f195a1a6fe416882984f8bd6c61afc1383171860 , < e6cc541fab01099fd8efadfa4f13afdf118bf536 (git)
Affected: f195a1a6fe416882984f8bd6c61afc1383171860 , < 5eca0d899a3be661a7e2caaaa7467a6fa15d756c (git)
Affected: f195a1a6fe416882984f8bd6c61afc1383171860 , < 894e136b432da75c0352c80299807a5c4b04f167 (git)
Affected: f195a1a6fe416882984f8bd6c61afc1383171860 , < 89177732fe1653bbfef10cf5d99bf20cf57762c2 (git)
Affected: f195a1a6fe416882984f8bd6c61afc1383171860 , < 873ce713fef5dde0939220f04f3484ec86a16fba (git)
Affected: aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9 (git)
Affected: a8986a61ebee0b54c5d648444fbae09bd1c6dcd2 (git)
Affected: 94491412a2afc8a5aea4c5b455aed86d3486f0b1 (git)
Affected: c2cd5d993f57f819d46fe62387d3cc34d8468e60 (git)
Affected: 449b1978d4e50b14b2a4de3a26d0b074593926a3 (git)
Affected: 5.10.195 , < 5.10.270 (semver)
Affected: 5.15.132 , < 5.15.221 (semver)
Affected: 6.1.53 , < 6.1.188 (semver)
Affected: 4.14.326 , < 4.15 (semver)
Affected: 4.19.295 , < 4.20 (semver)
Affected: 5.4.257 , < 5.5 (semver)
Affected: 6.4.16 , < 6.5 (semver)
Affected: 6.5.3 , < 6.6 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (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)
guessed Create a notification for this product.
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_transport: Fail TX enqueue when the QP link is down\n\nCommit f195a1a6fe41 (\"ntb: Drop packets when qp link is down\") meant to\nmake ntb_transport_tx_enqueue() drop packets submitted while the QP link\nis down, but it only returns 0 without consuming the packet. Zero means\nsuccess by this function\u0027s contract, so ntb_netdev reports NETDEV_TX_OK\nand forgets the skb: nothing queued it, nothing frees it, and it leaks,\none skb for every transmit racing a link-down.\n\nReturn -ENOLINK instead, restoring the contract that a non-zero return\nleaves the buffer owned by the caller. With the preceding patch,\nntb_netdev frees the skb on non-retryable enqueue failures and returns\nNETDEV_TX_OK, so a packet racing with link-down is dropped without leaking\nor entering a busy retry loop."
          }
        ],
        "id": "CVE-2026-80988",
        "lastModified": "2026-09-14T13:18:53.493",
        "metrics": {},
        "published": "2026-09-11T20:19:05.480",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5eca0d899a3be661a7e2caaaa7467a6fa15d756c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-14T19:55:24+00:00",
      "cve": "CVE-2026-80988",
      "id": "CVE-2026-80988",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NTB: ntb_transport: Fail TX enqueue when the QP link is down",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80988.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:04:37Z",
      "cve": "CVE-2026-80988",
      "id": "CVE-2026-80988",
      "initial_release_date": "2026-09-12T16:36:09Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80988",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80988.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.