CVE-2023-54033 (GCVE-0-2023-54033)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:56 – Updated: 2025-12-24 10:56
VLAI?
Title
bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps The LRU and LRU_PERCPU maps allocate a new element on update before locking the target hash table bucket. Right after that the maps try to lock the bucket. If this fails, then maps return -EBUSY to the caller without releasing the allocated element. This makes the element untracked: it doesn't belong to either of free lists, and it doesn't belong to the hash table, so can't be re-used; this eventually leads to the permanent -ENOMEM on LRU map updates, which is unexpected. Fix this by returning the element to the local free list if bucket locking fails.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9 (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 1a9e80f757bbb1562d82e350afce2bb2f712cc3d (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < b34ffb0c6d23583830f9327864b9c1f486003305 (git)
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    Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.115 , ≤ 5.15.* (semver)
Unaffected: 6.1.31 , ≤ 6.1.* (semver)
Unaffected: 6.3.5 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/hashtab.c"
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          "vendor": "Linux",
          "versions": [
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      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
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              "negate": false,
              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix a memory leak in the LRU and LRU_PERCPU hash maps\n\nThe LRU and LRU_PERCPU maps allocate a new element on update before locking the\ntarget hash table bucket. Right after that the maps try to lock the bucket.\nIf this fails, then maps return -EBUSY to the caller without releasing the\nallocated element. This makes the element untracked: it doesn\u0027t belong to\neither of free lists, and it doesn\u0027t belong to the hash table, so can\u0027t be\nre-used; this eventually leads to the permanent -ENOMEM on LRU map updates,\nwhich is unexpected. Fix this by returning the element to the local free list\nif bucket locking fails."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:56:00.579Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9"
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          "url": "https://git.kernel.org/stable/c/1a9e80f757bbb1562d82e350afce2bb2f712cc3d"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/b34ffb0c6d23583830f9327864b9c1f486003305"
        }
      ],
      "title": "bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54033",
    "datePublished": "2025-12-24T10:56:00.579Z",
    "dateReserved": "2025-12-24T10:53:46.180Z",
    "dateUpdated": "2025-12-24T10:56:00.579Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54033\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:15:56.297\",\"lastModified\":\"2025-12-29T15:58:56.260\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: fix a memory leak in the LRU and LRU_PERCPU hash maps\\n\\nThe LRU and LRU_PERCPU maps allocate a new element on update before locking the\\ntarget hash table bucket. Right after that the maps try to lock the bucket.\\nIf this fails, then maps return -EBUSY to the caller without releasing the\\nallocated element. This makes the element untracked: it doesn\u0027t belong to\\neither of free lists, and it doesn\u0027t belong to the hash table, so can\u0027t be\\nre-used; this eventually leads to the permanent -ENOMEM on LRU map updates,\\nwhich is unexpected. Fix this by returning the element to the local free list\\nif bucket locking fails.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a9e80f757bbb1562d82e350afce2bb2f712cc3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b34ffb0c6d23583830f9327864b9c1f486003305\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • 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.



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