GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2023-53221 (GCVE-0-2023-53221)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-05-23 15:28
VLAI
Title
bpf: Fix memleak due to fentry attach failure
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix memleak due to fentry attach failure If it fails to attach fentry, the allocated bpf trampoline image will be left in the system. That can be verified by checking /proc/kallsyms. This meamleak can be verified by a simple bpf program as follows: SEC("fentry/trap_init") int fentry_run() { return 0; } It will fail to attach trap_init because this function is freed after kernel init, and then we can find the trampoline image is left in the system by checking /proc/kallsyms. $ tail /proc/kallsyms ffffffffc0613000 t bpf_trampoline_6442453466_1 [bpf] ffffffffc06c3000 t bpf_trampoline_6442453466_1 [bpf] $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep "FUNC 'trap_init'" [2522] FUNC 'trap_init' type_id=119 linkage=static $ echo $((6442453466 & 0x7fffffff)) 2522 Note that there are two left bpf trampoline images, that is because the libbpf will fallback to raw tracepoint if -EINVAL is returned.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:50 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < 20109ddd5bea2c24d790debf5d02584ef24c3f5e (git)
Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < f72c67d1a82dada7d6d504c806e111e913721a30 (git)
Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < 6aa27775db63ba8c7c73891c7dfb71ddc230c48d (git)
Affected: e21aa341785c679dd409c8cb71f864c00fe6c463 , < 108598c39eefbedc9882273ac0df96127a629220 (git)
Affected: e21d2b92354b3cd25dd774ebb0f0e52ff04a7861 (git)
Affected: 85d177f56e5256e14b74a65940f981f6e3e8bb32 (git)
Affected: 5.10.28 , < 5.11 (semver)
Affected: 5.11.11 , < 5.12 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.3.13 , ≤ 6.3.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-53221",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T17:50:19.613865Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-401",
                "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T17:52:59.043Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/trampoline.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "20109ddd5bea2c24d790debf5d02584ef24c3f5e",
              "status": "affected",
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "versionType": "git"
            },
            {
              "lessThan": "f72c67d1a82dada7d6d504c806e111e913721a30",
              "status": "affected",
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "versionType": "git"
            },
            {
              "lessThan": "6aa27775db63ba8c7c73891c7dfb71ddc230c48d",
              "status": "affected",
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "versionType": "git"
            },
            {
              "lessThan": "108598c39eefbedc9882273ac0df96127a629220",
              "status": "affected",
              "version": "e21aa341785c679dd409c8cb71f864c00fe6c463",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e21d2b92354b3cd25dd774ebb0f0e52ff04a7861",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "85d177f56e5256e14b74a65940f981f6e3e8bb32",
              "versionType": "git"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.28",
              "versionType": "semver"
            },
            {
              "lessThan": "5.12",
              "status": "affected",
              "version": "5.11.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/trampoline.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.39",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.13",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.4",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.10.28",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.11.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memleak due to fentry attach failure\n\nIf it fails to attach fentry, the allocated bpf trampoline image will be\nleft in the system. That can be verified by checking /proc/kallsyms.\n\nThis meamleak can be verified by a simple bpf program as follows:\n\n  SEC(\"fentry/trap_init\")\n  int fentry_run()\n  {\n      return 0;\n  }\n\nIt will fail to attach trap_init because this function is freed after\nkernel init, and then we can find the trampoline image is left in the\nsystem by checking /proc/kallsyms.\n\n  $ tail /proc/kallsyms\n  ffffffffc0613000 t bpf_trampoline_6442453466_1  [bpf]\n  ffffffffc06c3000 t bpf_trampoline_6442453466_1  [bpf]\n\n  $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \"FUNC \u0027trap_init\u0027\"\n  [2522] FUNC \u0027trap_init\u0027 type_id=119 linkage=static\n\n  $ echo $((6442453466 \u0026 0x7fffffff))\n  2522\n\nNote that there are two left bpf trampoline images, that is because the\nlibbpf will fallback to raw tracepoint if -EINVAL is returned."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:28:16.750Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/20109ddd5bea2c24d790debf5d02584ef24c3f5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f72c67d1a82dada7d6d504c806e111e913721a30"
        },
        {
          "url": "https://git.kernel.org/stable/c/6aa27775db63ba8c7c73891c7dfb71ddc230c48d"
        },
        {
          "url": "https://git.kernel.org/stable/c/108598c39eefbedc9882273ac0df96127a629220"
        }
      ],
      "title": "bpf: Fix memleak due to fentry attach failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53221",
    "datePublished": "2025-09-15T14:21:50.053Z",
    "dateReserved": "2025-09-15T14:19:21.845Z",
    "dateUpdated": "2026-05-23T15:28:16.750Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53221",
      "date": "2026-09-16",
      "epss": "0.00155",
      "percentile": "0.05067"
    },
    "microsoft_vex": {
      "current_release_date": "2026-03-31T15:10:13.000Z",
      "cve": "CVE-2023-53221",
      "id": "msrc_CVE-2023-53221",
      "initial_release_date": "2025-09-02T00:00:00.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf: Fix memleak due to fentry attach failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2023-53221.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53221\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:48.873\",\"lastModified\":\"2026-06-17T06:44:32.793\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix memleak due to fentry attach failure\\n\\nIf it fails to attach fentry, the allocated bpf trampoline image will be\\nleft in the system. That can be verified by checking /proc/kallsyms.\\n\\nThis meamleak can be verified by a simple bpf program as follows:\\n\\n  SEC(\\\"fentry/trap_init\\\")\\n  int fentry_run()\\n  {\\n      return 0;\\n  }\\n\\nIt will fail to attach trap_init because this function is freed after\\nkernel init, and then we can find the trampoline image is left in the\\nsystem by checking /proc/kallsyms.\\n\\n  $ tail /proc/kallsyms\\n  ffffffffc0613000 t bpf_trampoline_6442453466_1  [bpf]\\n  ffffffffc06c3000 t bpf_trampoline_6442453466_1  [bpf]\\n\\n  $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \\\"FUNC \u0027trap_init\u0027\\\"\\n  [2522] FUNC \u0027trap_init\u0027 type_id=119 linkage=static\\n\\n  $ echo $((6442453466 \u0026 0x7fffffff))\\n  2522\\n\\nNote that there are two left bpf trampoline images, that is because the\\nlibbpf will fallback to raw tracepoint if -EINVAL is returned.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/trampoline.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e21aa341785c679dd409c8cb71f864c00fe6c463\",\"lessThan\":\"20109ddd5bea2c24d790debf5d02584ef24c3f5e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e21aa341785c679dd409c8cb71f864c00fe6c463\",\"lessThan\":\"f72c67d1a82dada7d6d504c806e111e913721a30\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e21aa341785c679dd409c8cb71f864c00fe6c463\",\"lessThan\":\"6aa27775db63ba8c7c73891c7dfb71ddc230c48d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e21aa341785c679dd409c8cb71f864c00fe6c463\",\"lessThan\":\"108598c39eefbedc9882273ac0df96127a629220\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e21d2b92354b3cd25dd774ebb0f0e52ff04a7861\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"85d177f56e5256e14b74a65940f981f6e3e8bb32\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.28\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.11.11\",\"lessThan\":\"5.12\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/trampoline.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.39\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3.13\",\"lessThanOrEqual\":\"6.3.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4.4\",\"lessThanOrEqual\":\"6.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-14T17:50:19.613865Z\",\"id\":\"CVE-2023-53221\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.28\",\"versionEndExcluding\":\"5.11\",\"matchCriteriaId\":\"5FB238AF-DE30-4383-9FB7-1425BA8B9BCC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.11\",\"versionEndExcluding\":\"5.12\",\"matchCriteriaId\":\"18E94C1C-980B-4CC6-9C63-60B225E69968\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12.1\",\"versionEndExcluding\":\"6.1.39\",\"matchCriteriaId\":\"E08F6A3C-3F8B-445B-97DB-1D37F6D7B2E1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.3.13\",\"matchCriteriaId\":\"95CB4836-7F5D-4C20-B025-8E046EC87B78\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.4\",\"versionEndExcluding\":\"6.4.4\",\"matchCriteriaId\":\"6AB81046-CB69-4115-924C-963B37C41385\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"75EB504D-4A83-4C67-9C8D-FD9C6C8EB4CD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"A935F9F1-DA8B-49F4-BF2B-FA01A92F113E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"DF0AF673-12B7-4274-9090-411D4939CB62\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"06AE06A6-A0C3-4556-BFFA-3D6E4BAC43C8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"FCE63934-38CF-4311-AD72-624E86AF3889\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/108598c39eefbedc9882273ac0df96127a629220\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/20109ddd5bea2c24d790debf5d02584ef24c3f5e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6aa27775db63ba8c7c73891c7dfb71ddc230c48d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f72c67d1a82dada7d6d504c806e111e913721a30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T22:13:47+00:00",
      "cve": "CVE-2023-53221",
      "id": "CVE-2023-53221",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix memleak due to fentry attach failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53221.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:08:54Z",
      "cve": "CVE-2023-53221",
      "id": "CVE-2023-53221",
      "initial_release_date": "2025-09-17T23:29:23Z",
      "product_status:known_affected": "455",
      "product_status:known_not_affected": "332",
      "product_status:recommended": "339",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53221",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53221.json",
      "version": "47"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53221\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T17:50:19.613865Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-401\", \"description\": \"CWE-401 Missing Release of Memory after Effective Lifetime\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T17:50:15.536Z\"}}], \"cna\": {\"title\": \"bpf: Fix memleak due to fentry attach failure\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e21aa341785c679dd409c8cb71f864c00fe6c463\", \"lessThan\": \"20109ddd5bea2c24d790debf5d02584ef24c3f5e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e21aa341785c679dd409c8cb71f864c00fe6c463\", \"lessThan\": \"f72c67d1a82dada7d6d504c806e111e913721a30\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e21aa341785c679dd409c8cb71f864c00fe6c463\", \"lessThan\": \"6aa27775db63ba8c7c73891c7dfb71ddc230c48d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e21aa341785c679dd409c8cb71f864c00fe6c463\", \"lessThan\": \"108598c39eefbedc9882273ac0df96127a629220\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e21d2b92354b3cd25dd774ebb0f0e52ff04a7861\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"85d177f56e5256e14b74a65940f981f6e3e8bb32\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.28\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.11.11\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}], \"programFiles\": [\"kernel/bpf/trampoline.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.3.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.3.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/trampoline.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/20109ddd5bea2c24d790debf5d02584ef24c3f5e\"}, {\"url\": \"https://git.kernel.org/stable/c/f72c67d1a82dada7d6d504c806e111e913721a30\"}, {\"url\": \"https://git.kernel.org/stable/c/6aa27775db63ba8c7c73891c7dfb71ddc230c48d\"}, {\"url\": \"https://git.kernel.org/stable/c/108598c39eefbedc9882273ac0df96127a629220\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix memleak due to fentry attach failure\\n\\nIf it fails to attach fentry, the allocated bpf trampoline image will be\\nleft in the system. That can be verified by checking /proc/kallsyms.\\n\\nThis meamleak can be verified by a simple bpf program as follows:\\n\\n  SEC(\\\"fentry/trap_init\\\")\\n  int fentry_run()\\n  {\\n      return 0;\\n  }\\n\\nIt will fail to attach trap_init because this function is freed after\\nkernel init, and then we can find the trampoline image is left in the\\nsystem by checking /proc/kallsyms.\\n\\n  $ tail /proc/kallsyms\\n  ffffffffc0613000 t bpf_trampoline_6442453466_1  [bpf]\\n  ffffffffc06c3000 t bpf_trampoline_6442453466_1  [bpf]\\n\\n  $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \\\"FUNC \u0027trap_init\u0027\\\"\\n  [2522] FUNC \u0027trap_init\u0027 type_id=119 linkage=static\\n\\n  $ echo $((6442453466 \u0026 0x7fffffff))\\n  2522\\n\\nNote that there are two left bpf trampoline images, that is because the\\nlibbpf will fallback to raw tracepoint if -EINVAL is returned.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.39\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3.13\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.4\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.10.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.11.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:28:16.750Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53221\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:28:16.750Z\", \"dateReserved\": \"2025-09-15T14:19:21.845Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-15T14:21:50.053Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
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.