CVE-2026-23436 (GCVE-0-2026-23436)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-11-05 21:33
VLAI
Title
net: shaper: protect from late creation of hierarchy
Summary
In the Linux kernel, the following vulnerability has been resolved: net: shaper: protect from late creation of hierarchy We look up a netdev during prep of Netlink ops (pre- callbacks) and take a ref to it. Then later in the body of the callback we take its lock or RCU which are the actual protections. The netdev may get unregistered in between the time we take the ref and the time we lock it. We may allocate the hierarchy after flush has already run, which would lead to a leak. Take the instance lock in pre- already, this saves us from the race and removes the need for dedicated lock/unlock callbacks completely. After all, if there's any chance of write happening concurrently with the flush - we're back to leaking the hierarchy. We may take the lock for devices which don't support shapers but we're only dealing with SET operations here, not taking the lock would be optimizing for an error case.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 21:30 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 93954b40f6a4fc43226c01a15b02732f884500f1 , < 719f6784f918f9e32f3ff3b197f900e852223f9d (git)
Affected: 93954b40f6a4fc43226c01a15b02732f884500f1 , < d22921727023e7852704965e935f4d1fc83a5ec9 (git)
Affected: 93954b40f6a4fc43226c01a15b02732f884500f1 , < d75ec7e8ba1979a1eb0b9211d94d749cdce849c8 (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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                      "versionEndExcluding": "6.18.20",
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                      "vulnerable": true
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          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: protect from late creation of hierarchy\n\nWe look up a netdev during prep of Netlink ops (pre- callbacks)\nand take a ref to it. Then later in the body of the callback\nwe take its lock or RCU which are the actual protections.\n\nThe netdev may get unregistered in between the time we take\nthe ref and the time we lock it. We may allocate the hierarchy\nafter flush has already run, which would lead to a leak.\n\nTake the instance lock in pre- already, this saves us from the race\nand removes the need for dedicated lock/unlock callbacks completely.\nAfter all, if there\u0027s any chance of write happening concurrently\nwith the flush - we\u0027re back to leaking the hierarchy.\n\nWe may take the lock for devices which don\u0027t support shapers but\nwe\u0027re only dealing with SET operations here, not taking the lock\nwould be optimizing for an error case."
            }
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          "providerMetadata": {
            "dateUpdated": "2026-05-11T22:06:52.320Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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              "url": "https://git.kernel.org/stable/c/719f6784f918f9e32f3ff3b197f900e852223f9d"
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              "url": "https://git.kernel.org/stable/c/d22921727023e7852704965e935f4d1fc83a5ec9"
            },
            {
              "url": "https://git.kernel.org/stable/c/d75ec7e8ba1979a1eb0b9211d94d749cdce849c8"
            }
          ],
          "title": "net: shaper: protect from late creation of hierarchy",
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          }
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-23436",
        "datePublished": "2026-04-03T15:15:21.280Z",
        "dateReserved": "2026-01-13T15:37:46.017Z",
        "dateUpdated": "2026-11-05T21:33:46.717Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.