Vulnerability-Lookup

GHSA-X2V8-3Q4Q-R8G6

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

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

net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir

In tcf_blockcast_redir(), when iterating block ports to redirect packets to multiple devices, the mac_header_xmit flag is queried from the wrong device. The loop sends to dev_prev but queries dev_is_mac_header_xmit(dev) — which is the NEXT device in the iteration, not the one being sent to.

This causes tcf_mirred_to_dev() to make incorrect decisions about whether to push or pull the MAC header. When the block contains mixed device types (e.g., an ethernet veth and a tunnel device), intermediate devices get the wrong mac_header_xmit flag, leading to skb header corruption. In the worst case, skb_push_rcsum with an incorrect mac_len can exhaust headroom and panic.

The last device in the loop is handled correctly (line 365-366 uses dev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste oversight for the intermediate devices.

Fix by using dev_prev instead of dev for the mac_header_xmit query, consistent with the device actually being sent to.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53014"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir\n\nIn tcf_blockcast_redir(), when iterating block ports to redirect\npackets to multiple devices, the mac_header_xmit flag is queried\nfrom the wrong device. The loop sends to dev_prev but queries\ndev_is_mac_header_xmit(dev) \u2014 which is the NEXT device in the\niteration, not the one being sent to.\n\nThis causes tcf_mirred_to_dev() to make incorrect decisions about\nwhether to push or pull the MAC header. When the block contains\nmixed device types (e.g., an ethernet veth and a tunnel device),\nintermediate devices get the wrong mac_header_xmit flag, leading to\nskb header corruption. In the worst case, skb_push_rcsum with an\nincorrect mac_len can exhaust headroom and panic.\n\nThe last device in the loop is handled correctly (line 365-366 uses\ndev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste\noversight for the intermediate devices.\n\nFix by using dev_prev instead of dev for the mac_header_xmit query,\nconsistent with the device actually being sent to.",
  "id": "GHSA-x2v8-3q4q-r8g6",
  "modified": "2026-06-24T18:32:43Z",
  "published": "2026-06-24T18:32:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53014"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4510d140524ca7d6e772db962e013f26f09a63b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4764953c4b47585eb72797b216b63a831dc0c7e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7db3e4e03032261b1b519341123fc30d995478ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fda5174286119addd28473fb2ec5bdf521c05a8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53014 (GCVE-0-2026-53014)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29

Title

net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir In tcf_blockcast_redir(), when iterating block ports to redirect packets to multiple devices, the mac_header_xmit flag is queried from the wrong device. The loop sends to dev_prev but queries dev_is_mac_header_xmit(dev) — which is the NEXT device in the iteration, not the one being sent to. This causes tcf_mirred_to_dev() to make incorrect decisions about whether to push or pull the MAC header. When the block contains mixed device types (e.g., an ethernet veth and a tunnel device), intermediate devices get the wrong mac_header_xmit flag, leading to skb header corruption. In the worst case, skb_push_rcsum with an incorrect mac_len can exhaust headroom and panic. The last device in the loop is handled correctly (line 365-366 uses dev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste oversight for the intermediate devices. Fix by using dev_prev instead of dev for the mac_header_xmit query, consistent with the device actually being sent to.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/8fda5174286119add…
https://git.kernel.org/stable/c/7db3e4e03032261b1…
https://git.kernel.org/stable/c/4764953c4b47585eb…
https://git.kernel.org/stable/c/4510d140524ca7d6e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 42f39036cda808d3de243192a2cf5125f12f3047 , < 8fda5174286119addd28473fb2ec5bdf521c05a8 (git) Affected: 42f39036cda808d3de243192a2cf5125f12f3047 , < 7db3e4e03032261b1b519341123fc30d995478ca (git) Affected: 42f39036cda808d3de243192a2cf5125f12f3047 , < 4764953c4b47585eb72797b216b63a831dc0c7e6 (git) Affected: 42f39036cda808d3de243192a2cf5125f12f3047 , < 4510d140524ca7d6e772db962e013f26f09a63b1 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/act_mirred.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8fda5174286119addd28473fb2ec5bdf521c05a8",
              "status": "affected",
              "version": "42f39036cda808d3de243192a2cf5125f12f3047",
              "versionType": "git"
            },
            {
              "lessThan": "7db3e4e03032261b1b519341123fc30d995478ca",
              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
              "lessThan": "4510d140524ca7d6e772db962e013f26f09a63b1",
              "status": "affected",
              "version": "42f39036cda808d3de243192a2cf5125f12f3047",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/act_mirred.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
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                },
                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir\n\nIn tcf_blockcast_redir(), when iterating block ports to redirect\npackets to multiple devices, the mac_header_xmit flag is queried\nfrom the wrong device. The loop sends to dev_prev but queries\ndev_is_mac_header_xmit(dev) \u2014 which is the NEXT device in the\niteration, not the one being sent to.\n\nThis causes tcf_mirred_to_dev() to make incorrect decisions about\nwhether to push or pull the MAC header. When the block contains\nmixed device types (e.g., an ethernet veth and a tunnel device),\nintermediate devices get the wrong mac_header_xmit flag, leading to\nskb header corruption. In the worst case, skb_push_rcsum with an\nincorrect mac_len can exhaust headroom and panic.\n\nThe last device in the loop is handled correctly (line 365-366 uses\ndev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste\noversight for the intermediate devices.\n\nFix by using dev_prev instead of dev for the mac_header_xmit query,\nconsistent with the device actually being sent to."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:24.605Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8fda5174286119addd28473fb2ec5bdf521c05a8"
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        {
          "url": "https://git.kernel.org/stable/c/4510d140524ca7d6e772db962e013f26f09a63b1"
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      ],
      "title": "net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir",
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        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53014",
    "datePublished": "2026-06-24T16:29:24.605Z",
    "dateReserved": "2026-06-09T07:44:35.378Z",
    "dateUpdated": "2026-06-24T16:29:24.605Z",
    "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.

Action not permitted

GHSA-X2V8-3Q4Q-R8G6

CVE-2026-53014 (GCVE-0-2026-53014)

Tags

Sightings

Nomenclature