CVE-2026-63982 (GCVE-0-2026-63982)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-07-19 14:56
VLAI
Title
net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop When mirred redirects to ingress (from either ingress or egress) the loop state from sched_mirred_dev array dev is lost because of 1) the packet deferral into the backlog and 2) the fact the sched_mirred_dev array is cleared. In such cases, if there was a loop we won't discover it. Here's a simple test to reproduce: ip a add dev port0 10.10.10.11/24 tc qdisc add dev port0 clsact tc filter add dev port0 egress protocol ip \ prio 10 matchall action mirred ingress redirect dev port1 tc qdisc add dev port1 clsact tc filter add dev port1 ingress protocol ip \ prio 10 matchall action mirred egress redirect dev port0 ping -c 1 -W0.01 10.10.10.10
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 906736728cea480a85803c67fafb1b0e78491922 , < 66f4607fe788fc7d81bce0e2f7b3726ed2f71284 (git)
Affected: fe946a751d9b52b7c45ca34899723b314b79b249 , < 45ac526a0d5733c3695946bd84ec57f24d8f5e66 (git)
Affected: fe946a751d9b52b7c45ca34899723b314b79b249 , < db875221ab08d213a83bf30196ae8b64d55a3403 (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "net/sched/act_mirred.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Fix ethx:ingress -\u003e ethy:egress -\u003e ethx:ingress mirred loop\n\nWhen mirred redirects to ingress (from either ingress or egress) the loop\nstate from sched_mirred_dev array dev is lost because of 1) the packet\ndeferral into the backlog and 2) the fact the sched_mirred_dev array is\ncleared. In such cases, if there was a loop we won\u0027t discover it.\n\nHere\u0027s a simple test to reproduce:\nip a add dev port0 10.10.10.11/24\n\ntc qdisc add dev port0 clsact\ntc filter add dev port0 egress protocol ip \\\n   prio 10 matchall action mirred ingress redirect dev port1\n\ntc qdisc add dev port1 clsact\ntc filter add dev port1 ingress protocol ip \\\n   prio 10 matchall action mirred egress redirect dev port0\n\nping -c 1 -W0.01 10.10.10.10"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:56:05.329Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/66f4607fe788fc7d81bce0e2f7b3726ed2f71284"
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        },
        {
          "url": "https://git.kernel.org/stable/c/db875221ab08d213a83bf30196ae8b64d55a3403"
        }
      ],
      "title": "net/sched: Fix ethx:ingress -\u003e ethy:egress -\u003e ethx:ingress mirred loop",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63982",
    "datePublished": "2026-07-19T14:56:05.329Z",
    "dateReserved": "2026-07-19T07:54:57.025Z",
    "dateUpdated": "2026-07-19T14:56:05.329Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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  }
}



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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.

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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.
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  • 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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