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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
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.
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{
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          "product": "Linux",
          "programFiles": [
            "kernel/bpf/hashtab.c"
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          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:54:07.901Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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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"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-28",
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    "nvd": {
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            "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."
          }
        ],
        "id": "CVE-2023-54033",
        "lastModified": "2026-06-17T06:46:34.477",
        "metrics": {},
        "published": "2025-12-24T11:15:56.297",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54033.json",
      "version": "11"
    }
  }
}



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