Vulnerability-Lookup

CVE-2026-64530 (GCVE-0-2026-64530)

Vulnerability from cvelistv5 – Published: 2026-07-26 06:28 – Updated: 2026-07-26 06:28

Title

net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order fragments). When that happens the skb is no longer owned by the caller and must not be touched again. tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the switch and returned the skb to the caller as if classification had passed. The only qdisc that wires up qevents today is RED, via three call sites (qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop) red_enqueue() was continuing to operate on an skb it no longer owns in this case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF. tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10 tc filter add block 10 ... action ct (with ct defrag enabled and traffic that produces out-of-order fragments, e.g. a fragmented UDP stream) Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress and egress fast paths do: treat it as stolen and return NULL without touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be dropped/freed here, as it is no longer owned by us.

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/5ed3d6f8599165666…
https://git.kernel.org/stable/c/f42e8134a3a1074b8…
https://git.kernel.org/stable/c/447d493034a9cf7bf…
https://git.kernel.org/stable/c/e1270e69dcf2c3512…
https://git.kernel.org/stable/c/2140c2f3f2e7b066e…
https://git.kernel.org/stable/c/e28aedab948834392…
https://git.kernel.org/stable/c/a8a02897f2b479127…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 172ba7d46c202e679f3ccb10264c67416aaeb1c4 , < 5ed3d6f85991656667059d3fa5a1d683ac58c447 (git) Affected: 0b5b831122fc3789fff75be433ba3e4dd7b779d4 , < f42e8134a3a1074b834a574d404352f867ba994a (git) Affected: 73f7da5fd124f2cda9161e2e46114915e6e82e97 , < 447d493034a9cf7bf13a2abac86d0573d907ec2f (git) Affected: 3f14b377d01d8357eba032b4cabc8c1149b458b6 , < e1270e69dcf2c3512c453484178f2e9dc0db3f05 (git) Affected: 3f14b377d01d8357eba032b4cabc8c1149b458b6 , < 2140c2f3f2e7b066e1ae616ede8856cafd8015e9 (git) Affected: 3f14b377d01d8357eba032b4cabc8c1149b458b6 , < e28aedab9488343924d227b5a896faed67ce84d5 (git) Affected: 3f14b377d01d8357eba032b4cabc8c1149b458b6 , < a8a02897f2b479127db261de05cbf0c28b98d159 (git) Affected: f5346df0591d10bc948761ca854b1fae6d2ef441 (git) Affected: 5.15.148 , < 5.15.212 (semver) Affected: 6.1.75 , < 6.1.178 (semver) Affected: 6.6.14 , < 6.6.145 (semver) Affected: 6.7.2 , < 6.8 (semver)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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The only qdisc that wires up qevents today is RED, via three call sites\\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\\n\\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\\n  tc filter add block 10 ... action ct\\n\\n  (with ct defrag enabled and traffic that produces out-of-order\\n  fragments, e.g. a fragmented UDP stream)\\n\\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\\nand egress fast paths do: treat it as stolen and return NULL without\\ntouching the skb. 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}

GHSA-W5H3-GV63-49VP

Vulnerability from github – Published: 2026-07-26 09:30 – Updated: 2026-07-26 09:30

Details

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

net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order fragments). When that happens the skb is no longer owned by the caller and must not be touched again.

tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the switch and returned the skb to the caller as if classification had passed. The only qdisc that wires up qevents today is RED, via three call sites (qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop) red_enqueue() was continuing to operate on an skb it no longer owns in this case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.

tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10 tc filter add block 10 ... action ct

(with ct defrag enabled and traffic that produces out-of-order fragments, e.g. a fragmented UDP stream)

Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress and egress fast paths do: treat it as stolen and return NULL without touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be dropped/freed here, as it is no longer owned by us.

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64530"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-26T07:16:41Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n  tc filter add block 10 ... action ct\n\n  (with ct defrag enabled and traffic that produces out-of-order\n  fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us.",
  "id": "GHSA-w5h3-gv63-49vp",
  "modified": "2026-07-26T09:30:22Z",
  "published": "2026-07-26T09:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64530"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64530 (GCVE-0-2026-64530)

GHSA-W5H3-GV63-49VP

Tags

Sightings

Nomenclature