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

CVE-2023-54247 (GCVE-0-2023-54247)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:15 – Updated: 2026-05-11 19:58
VLAI
Title
bpf: Silence a warning in btf_type_id_size()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Silence a warning in btf_type_id_size() syzbot reported a warning in [1] with the following stacktrace: WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988 ... RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988 ... Call Trace: <TASK> map_check_btf kernel/bpf/syscall.c:1024 [inline] map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198 __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040 __do_sys_bpf kernel/bpf/syscall.c:5162 [inline] __se_sys_bpf kernel/bpf/syscall.c:5160 [inline] __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd With the following btf [1] DECL_TAG 'a' type_id=4 component_idx=-1 [2] PTR '(anon)' type_id=0 [3] TYPE_TAG 'a' type_id=2 [4] VAR 'a' type_id=3, linkage=static and when the bpf_attr.btf_key_type_id = 1 (DECL_TAG), the following WARN_ON_ONCE in btf_type_id_size() is triggered: if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) && !btf_type_is_var(size_type))) return NULL; Note that 'return NULL' is the correct behavior as we don't want a DECL_TAG type to be used as a btf_{key,value}_type_id even for the case like 'DECL_TAG -> STRUCT'. So there is no correctness issue here, we just want to silence warning. To silence the warning, I added DECL_TAG as one of kinds in btf_type_nosize() which will cause btf_type_id_size() returning NULL earlier without the warning. [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef , < 61f4bd46a03a81865aca3bcbad2f7b7032fb3160 (git)
Affected: b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef , < 7c4f5ab63e7962812505cbd38cc765168a223acb (git)
Affected: b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef , < e6c2f594ed961273479505b42040782820190305 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.110 , ≤ 6.1.* (semver)
Unaffected: 6.4.7 , ≤ 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": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/btf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "61f4bd46a03a81865aca3bcbad2f7b7032fb3160",
              "status": "affected",
              "version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
              "versionType": "git"
            },
            {
              "lessThan": "7c4f5ab63e7962812505cbd38cc765168a223acb",
              "status": "affected",
              "version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
              "versionType": "git"
            },
            {
              "lessThan": "e6c2f594ed961273479505b42040782820190305",
              "status": "affected",
              "version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/btf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.7",
              "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": "6.1.110",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.7",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Silence a warning in btf_type_id_size()\n\nsyzbot reported a warning in [1] with the following stacktrace:\n  WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n  ...\n  RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n  ...\n  Call Trace:\n   \u003cTASK\u003e\n   map_check_btf kernel/bpf/syscall.c:1024 [inline]\n   map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198\n   __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040\n   __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]\n   __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]\n   __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nWith the following btf\n  [1] DECL_TAG \u0027a\u0027 type_id=4 component_idx=-1\n  [2] PTR \u0027(anon)\u0027 type_id=0\n  [3] TYPE_TAG \u0027a\u0027 type_id=2\n  [4] VAR \u0027a\u0027 type_id=3, linkage=static\nand when the bpf_attr.btf_key_type_id = 1 (DECL_TAG),\nthe following WARN_ON_ONCE in btf_type_id_size() is triggered:\n  if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) \u0026\u0026\n                   !btf_type_is_var(size_type)))\n          return NULL;\n\nNote that \u0027return NULL\u0027 is the correct behavior as we don\u0027t want\na DECL_TAG type to be used as a btf_{key,value}_type_id even\nfor the case like \u0027DECL_TAG -\u003e STRUCT\u0027. So there\nis no correctness issue here, we just want to silence warning.\n\nTo silence the warning, I added DECL_TAG as one of kinds in\nbtf_type_nosize() which will cause btf_type_id_size() returning\nNULL earlier without the warning.\n\n  [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:58:18.212Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/61f4bd46a03a81865aca3bcbad2f7b7032fb3160"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c4f5ab63e7962812505cbd38cc765168a223acb"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6c2f594ed961273479505b42040782820190305"
        }
      ],
      "title": "bpf: Silence a warning in btf_type_id_size()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54247",
    "datePublished": "2025-12-30T12:15:45.395Z",
    "dateReserved": "2025-12-30T12:06:44.513Z",
    "dateUpdated": "2026-05-11T19:58:18.212Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-54247",
      "date": "2026-09-20",
      "epss": "0.00193",
      "percentile": "0.09306"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "kernel/bpf/btf.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "61f4bd46a03a81865aca3bcbad2f7b7032fb3160",
                    "status": "affected",
                    "version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7c4f5ab63e7962812505cbd38cc765168a223acb",
                    "status": "affected",
                    "version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e6c2f594ed961273479505b42040782820190305",
                    "status": "affected",
                    "version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "kernel/bpf/btf.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.16"
                  },
                  {
                    "lessThan": "5.16",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.4.*",
                    "status": "unaffected",
                    "version": "6.4.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.5",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Silence a warning in btf_type_id_size()\n\nsyzbot reported a warning in [1] with the following stacktrace:\n  WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n  ...\n  RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n  ...\n  Call Trace:\n   \u003cTASK\u003e\n   map_check_btf kernel/bpf/syscall.c:1024 [inline]\n   map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198\n   __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040\n   __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]\n   __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]\n   __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nWith the following btf\n  [1] DECL_TAG \u0027a\u0027 type_id=4 component_idx=-1\n  [2] PTR \u0027(anon)\u0027 type_id=0\n  [3] TYPE_TAG \u0027a\u0027 type_id=2\n  [4] VAR \u0027a\u0027 type_id=3, linkage=static\nand when the bpf_attr.btf_key_type_id = 1 (DECL_TAG),\nthe following WARN_ON_ONCE in btf_type_id_size() is triggered:\n  if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) \u0026\u0026\n                   !btf_type_is_var(size_type)))\n          return NULL;\n\nNote that \u0027return NULL\u0027 is the correct behavior as we don\u0027t want\na DECL_TAG type to be used as a btf_{key,value}_type_id even\nfor the case like \u0027DECL_TAG -\u003e STRUCT\u0027. So there\nis no correctness issue here, we just want to silence warning.\n\nTo silence the warning, I added DECL_TAG as one of kinds in\nbtf_type_nosize() which will cause btf_type_id_size() returning\nNULL earlier without the warning.\n\n  [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: Silenciar una advertencia en btf_type_id_size()\n\nsyzbot inform\u00f3 una advertencia en [1] con el siguiente stacktrace:\n  WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n  ...\n  RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n  ...\n  Traza de Llamada:\n   \n   map_check_btf kernel/bpf/syscall.c:1024 [inline]\n   map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198\n   __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040\n   __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]\n   __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]\n   __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nCon el siguiente btf\n  [1] DECL_TAG \u0027a\u0027 type_id=4 component_idx=-1\n  [2] PTR \u0027(anon)\u0027 type_id=0\n  [3] TYPE_TAG \u0027a\u0027 type_id=2\n  [4] VAR \u0027a\u0027 type_id=3, linkage=static\ny cuando bpf_attr.btf_key_type_id = 1 (DECL_TAG),\nel siguiente WARN_ON_ONCE en btf_type_id_size() se activa:\n  if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) \u0026amp;\u0026amp;\n                   !btf_type_is_var(size_type)))\n          return NULL;\n\nTenga en cuenta que \u0027return NULL\u0027 es el comportamiento correcto ya que no queremos\nque un tipo DECL_TAG sea usado como btf_{key,value}_type_id incluso\npara el caso como \u0027DECL_TAG -\u0026gt; STRUCT\u0027. As\u00ed que no hay\nning\u00fan problema de correcci\u00f3n aqu\u00ed, solo queremos silenciar la advertencia.\n\nPara silenciar la advertencia, agregu\u00e9 DECL_TAG como uno de los tipos en\nbtf_type_nosize() lo que har\u00e1 que btf_type_id_size() devuelva\nNULL antes sin la advertencia.\n\n  [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/"
          }
        ],
        "id": "CVE-2023-54247",
        "lastModified": "2026-06-17T06:47:05.280",
        "metrics": {},
        "published": "2025-12-30T13:16:13.327",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/61f4bd46a03a81865aca3bcbad2f7b7032fb3160"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7c4f5ab63e7962812505cbd38cc765168a223acb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e6c2f594ed961273479505b42040782820190305"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:16:51+00:00",
      "cve": "CVE-2023-54247",
      "id": "CVE-2023-54247",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Silence a warning in btf_type_id_size()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54247.json",
      "version": "3"
    }
  }
}



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.