Vulnerability-Lookup

GHSA-C6M3-GH7V-93HM

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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

net: team: free skb when broadcast has no txable port

bc_transmit() sends the original skb through the last txable port. When no port is txable, it returns false without consuming the skb, but team_xmit() still returns NETDEV_TX_OK. AF_PACKET sends then retain the skb and its socket write-memory charge.

A TX-enabled, link-down port keeps the broadcast transmit op installed. Carrier can stay up through a second link-up, TX-disabled port or be forced on by userspace. Free the original skb on the no-port path while leaving the existing drop accounting intact.

Discovered by Sashiko during review of previous commit.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99026"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:25Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: team: free skb when broadcast has no txable port\n\nbc_transmit() sends the original skb through the last txable port.\nWhen no port is txable, it returns false without consuming the skb, but\nteam_xmit() still returns NETDEV_TX_OK. AF_PACKET sends then retain the\nskb and its socket write-memory charge.\n\nA TX-enabled, link-down port keeps the broadcast transmit op installed.\nCarrier can stay up through a second link-up, TX-disabled port or be\nforced on by userspace. Free the original skb on the no-port path while\nleaving the existing drop accounting intact.\n\nDiscovered by Sashiko during review of previous commit.",
  "id": "GHSA-c6m3-gh7v-93hm",
  "modified": "2026-10-23T15:31:35Z",
  "published": "2026-10-23T15:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99026"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/489114c9ecae44e523361a4b3e610ee5ebd9189c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/961563117626f4681623077ec0cfd86f86da0d49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f34b1bcac4581a5bd3daf9eff90f175e736b54aa"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99026 (GCVE-0-2026-99026)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-23 12:21

Title

net: team: free skb when broadcast has no txable port

Summary

In the Linux kernel, the following vulnerability has been resolved: net: team: free skb when broadcast has no txable port bc_transmit() sends the original skb through the last txable port. When no port is txable, it returns false without consuming the skb, but team_xmit() still returns NETDEV_TX_OK. AF_PACKET sends then retain the skb and its socket write-memory charge. A TX-enabled, link-down port keeps the broadcast transmit op installed. Carrier can stay up through a second link-up, TX-disabled port or be forced on by userspace. Free the original skb on the no-port path while leaving the existing drop accounting intact. Discovered by Sashiko during review of previous commit.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/961563117626f4681…
https://git.kernel.org/stable/c/f34b1bcac4581a5bd…
https://git.kernel.org/stable/c/489114c9ecae44e52…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5fc889911a99043a97da1daa0d010ad72cbc3042 , < 961563117626f4681623077ec0cfd86f86da0d49 (git) Affected: 5fc889911a99043a97da1daa0d010ad72cbc3042 , < f34b1bcac4581a5bd3daf9eff90f175e736b54aa (git) Affected: 5fc889911a99043a97da1daa0d010ad72cbc3042 , < 489114c9ecae44e523361a4b3e610ee5ebd9189c (git)
Linux	Linux	Affected: 3.6 Unaffected: 0 , < 3.6 (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/team/team_mode_broadcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "961563117626f4681623077ec0cfd86f86da0d49",
              "status": "affected",
              "version": "5fc889911a99043a97da1daa0d010ad72cbc3042",
              "versionType": "git"
            },
            {
              "lessThan": "f34b1bcac4581a5bd3daf9eff90f175e736b54aa",
              "status": "affected",
              "version": "5fc889911a99043a97da1daa0d010ad72cbc3042",
              "versionType": "git"
            },
            {
              "lessThan": "489114c9ecae44e523361a4b3e610ee5ebd9189c",
              "status": "affected",
              "version": "5fc889911a99043a97da1daa0d010ad72cbc3042",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/team/team_mode_broadcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.6"
            },
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              "lessThan": "3.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: team: free skb when broadcast has no txable port\n\nbc_transmit() sends the original skb through the last txable port.\nWhen no port is txable, it returns false without consuming the skb, but\nteam_xmit() still returns NETDEV_TX_OK. AF_PACKET sends then retain the\nskb and its socket write-memory charge.\n\nA TX-enabled, link-down port keeps the broadcast transmit op installed.\nCarrier can stay up through a second link-up, TX-disabled port or be\nforced on by userspace. Free the original skb on the no-port path while\nleaving the existing drop accounting intact.\n\nDiscovered by Sashiko during review of previous commit."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:21:13.509Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/489114c9ecae44e523361a4b3e610ee5ebd9189c"
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      "title": "net: team: free skb when broadcast has no txable port",
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    "datePublished": "2026-10-23T12:21:13.509Z",
    "dateReserved": "2026-09-25T10:25:14.386Z",
    "dateUpdated": "2026-10-23T12:21:13.509Z",
    "state": "PUBLISHED"
  },
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}

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.

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