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CVE-2022-50043 (GCVE-0-2022-50043)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:01 – Updated: 2026-05-11 19:11
VLAI
Title
net: fix potential refcount leak in ndisc_router_discovery()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix potential refcount leak in ndisc_router_discovery() The issue happens on specific paths in the function. After both the object `rt` and `neigh` are grabbed successfully, when `lifetime` is nonzero but the metric needs change, the function just deletes the route and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh` again if above conditions hold. The function simply overwrite `neigh` if succeeds or returns if fails, without decreasing the reference count of previous `neigh`. This may result in memory leaks. Fix it by decrementing the reference count of `neigh` in place.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6b2e04bc240fe9be9e690059f710e9f95346d34d , < ffb15594433391fd7885eb88ce5a7f7bdeefbb15 (git)
Affected: 6b2e04bc240fe9be9e690059f710e9f95346d34d , < 7998043d31d000c3a93f46182e6569dd0eecda34 (git)
Affected: 6b2e04bc240fe9be9e690059f710e9f95346d34d , < 7396ba87f1edf549284869451665c7c4e74ecd4f (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.63 , ≤ 5.15.* (semver)
Unaffected: 5.19.4 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "current_release_date": "2026-06-29T21:38:01+00:00",
      "cve": "CVE-2022-50043",
      "id": "CVE-2022-50043",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "108",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: fix potential refcount leak in ndisc_router_discovery()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50043.json",
      "version": "3"
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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.

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.
  • 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.


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.