CVE-2026-100071 (GCVE-0-2026-100071)

Vulnerability from cvelistv5 – Published: 2026-09-25 13:06 – Updated: 2026-09-25 13:06
VLAI
Title
net: hsr: free learned nodes on device setup failure
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hsr: free learned nodes on device setup failure hsr_dev_finalize() can fail after a lower-device RX handler has already been registered (slave A is added before the failable slave B and interlink adds). RX handlers run in softirq regardless of the master's state, so frames received in that window can learn dynamic nodes into node_db, and the error unwind never releases them. Free both owned dynamic databases in the unwind, mirroring hsr_dellink(). proxy_node_db is provably empty on every current error exit (only interlink RX feeds it, and the interlink add is the last failable step) and is freed for symmetry. The order is safe: hsr_del_port() unregisters each RX handler with synchronize_net() before hsr_del_nodes() runs, which removes remaining entries with list_del_rcu() and defers their release with call_rcu() for readers already under RCU.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 , < e691eee886871b933d772ffc76d66c80b4c0a25e (git)
Affected: 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 , < 0a340ffd96943a49a78e367efac9517ca767d99b (git)
Affected: 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 , < f7289e3492f2694dccd3d79287e0e31879b58650 (git)
Affected: 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 , < 65702339b3e9fd792f65d4b740928798194d86ce (git)
Affected: 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 , < 49b01f2939abc676a6f9a118f07a10110ee5f683 (git)
Affected: 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 , < 7f16289b91eb316f170a6bd22d32e6c632f6a5b6 (git)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: free learned nodes on device setup failure\n\nhsr_dev_finalize() can fail after a lower-device RX handler has\nalready been registered (slave A is added before the failable slave B\nand interlink adds). RX handlers run in softirq regardless of the\nmaster\u0027s state, so frames received in that window can learn dynamic\nnodes into node_db, and the error unwind never releases them.\n\nFree both owned dynamic databases in the unwind, mirroring\nhsr_dellink(). proxy_node_db is provably empty on every current error\nexit (only interlink RX feeds it, and the interlink add is the last\nfailable step) and is freed for symmetry. The order is safe:\nhsr_del_port() unregisters each RX handler with synchronize_net()\nbefore hsr_del_nodes() runs, which removes remaining entries with\nlist_del_rcu() and defers their release with call_rcu() for readers\nalready under RCU."
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        ],
        "id": "CVE-2026-100071",
        "lastModified": "2026-09-30T14:10:59.253",
        "metrics": {},
        "published": "2026-09-25T14:17:13.567",
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        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}



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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.

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.



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.