CVE-2024-49936 (GCVE-0-2024-49936)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-08-05 11:40
VLAI
Title
net/xen-netback: prevent UAF in xenvif_flush_hash()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/xen-netback: prevent UAF in xenvif_flush_hash() During the list_for_each_entry_rcu iteration call of xenvif_flush_hash, kfree_rcu does not exist inside the rcu read critical section, so if kfree_rcu is called when the rcu grace period ends during the iteration, UAF occurs when accessing head->next after the entry becomes free. Therefore, to solve this, you need to change it to list_for_each_entry_safe.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:38 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 3c4423b0c4b98213b3438e15061e1d08220e6982 (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < a0465723b8581cad27164c9073fd780904cd22d4 (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < efcff6ce7467f01f0753609f420333f3f2ceceda (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 143edf098b80669d05245b2f2367dd156a83a2c5 (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < d408889d4b54f5501e4becc4dbbb9065143fbf4e (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 54d8639af5568fc41c0e274fc3ec9cf86c59fcbb (git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 0fa5e94a1811d68fbffa0725efe6d4ca62c03d12 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.4.290 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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            {
              "url": "https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5"
            },
            {
              "url": "https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e"
            },
            {
              "url": "https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb"
            },
            {
              "url": "https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12"
            }
          ],
          "title": "net/xen-netback: prevent UAF in xenvif_flush_hash()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-49936",
        "datePublished": "2024-10-21T18:01:57.066Z",
        "dateReserved": "2024-10-21T12:17:06.042Z",
        "dateUpdated": "2026-05-11T20:42:17.479Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.


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.