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

Vulnerability from cvelistv5 – Published: 2025-12-24 10:56 – Updated: 2026-05-11 19:54
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 CPE status
Linux Linux Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9 (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 1a9e80f757bbb1562d82e350afce2bb2f712cc3d (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e (git)
Affected: 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 , < b34ffb0c6d23583830f9327864b9c1f486003305 (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
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{
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          "product": "Linux",
          "programFiles": [
            "kernel/bpf/hashtab.c"
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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": "2026-05-11T19:54:07.901Z",
        "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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        },
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        },
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          "url": "https://git.kernel.org/stable/c/b34ffb0c6d23583830f9327864b9c1f486003305"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54033",
    "datePublished": "2025-12-24T10:56:00.579Z",
    "dateReserved": "2025-12-24T10:53:46.180Z",
    "dateUpdated": "2026-05-11T19:54:07.901Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-09-15",
      "epss": "0.00182",
      "percentile": "0.08"
    },
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    "redhat_vex": {
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      "cve": "CVE-2023-54033",
      "id": "CVE-2023-54033",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
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      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via memory leak in LRU hash maps",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54033.json",
      "version": "3"
    },
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      "current_release_date": "2026-08-31T00:54:43Z",
      "cve": "CVE-2023-54033",
      "id": "CVE-2023-54033",
      "initial_release_date": "2025-12-25T00:57:13Z",
      "product_status:known_affected": "128",
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      "product_status:recommended": "29",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54033",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54033.json",
      "version": "11"
    }
  }
}



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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.


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.