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CVE-2022-49837 (GCVE-0-2022-49837)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-05-11 19:07
VLAI
Title
bpf: Fix memory leaks in __check_func_call
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix memory leaks in __check_func_call kmemleak reports this issue: unreferenced object 0xffff88817139d000 (size 2048): comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<0000000045f075f0>] kmalloc_trace+0x27/0xa0 [<0000000098b7c90a>] __check_func_call+0x316/0x1230 [<00000000b4c3c403>] check_helper_call+0x172e/0x4700 [<00000000aa3875b7>] do_check+0x21d8/0x45e0 [<000000001147357b>] do_check_common+0x767/0xaf0 [<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0 [<0000000011e391b1>] bpf_prog_load+0xf26/0x1940 [<0000000007f765c0>] __sys_bpf+0xd2c/0x3650 [<00000000839815d6>] __x64_sys_bpf+0x75/0xc0 [<00000000946ee250>] do_syscall_64+0x3b/0x90 [<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd The root case here is: In function prepare_func_exit(), the callee is not released in the abnormal scenario after "state->curframe--;". To fix, move "state->curframe--;" to the very bottom of the function, right when we free callee and reset frame[] pointer to NULL, as Andrii suggested. In addition, function __check_func_call() has a similar problem. In the abnormal scenario before "state->curframe++;", the callee also should be released by free_func_state().
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 2025-10-01 17:02 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < d4944497827a3d14bc5a26dbcfb7433eb5a956c0 (git)
Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < 83946d772e756734a900ef99dbe0aeda506adf37 (git)
Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < eb86559a691cea5fa63e57a03ec3dc9c31e97955 (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memory leaks in __check_func_call\n\nkmemleak reports this issue:\n\nunreferenced object 0xffff88817139d000 (size 2048):\n  comm \"test_progs\", pid 33246, jiffies 4307381979 (age 45851.820s)\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003c0000000045f075f0\u003e] kmalloc_trace+0x27/0xa0\n    [\u003c0000000098b7c90a\u003e] __check_func_call+0x316/0x1230\n    [\u003c00000000b4c3c403\u003e] check_helper_call+0x172e/0x4700\n    [\u003c00000000aa3875b7\u003e] do_check+0x21d8/0x45e0\n    [\u003c000000001147357b\u003e] do_check_common+0x767/0xaf0\n    [\u003c00000000b5a595b4\u003e] bpf_check+0x43e3/0x5bc0\n    [\u003c0000000011e391b1\u003e] bpf_prog_load+0xf26/0x1940\n    [\u003c0000000007f765c0\u003e] __sys_bpf+0xd2c/0x3650\n    [\u003c00000000839815d6\u003e] __x64_sys_bpf+0x75/0xc0\n    [\u003c00000000946ee250\u003e] do_syscall_64+0x3b/0x90\n    [\u003c0000000000506b7f\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root case here is: In function prepare_func_exit(), the callee is\nnot released in the abnormal scenario after \"state-\u003ecurframe--;\". To\nfix, move \"state-\u003ecurframe--;\" to the very bottom of the function,\nright when we free callee and reset frame[] pointer to NULL, as Andrii\nsuggested.\n\nIn addition, function __check_func_call() has a similar problem. In\nthe abnormal scenario before \"state-\u003ecurframe++;\", the callee also\nshould be released by free_func_state()."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se corrigen fugas de memoria en __check_func_call kmemleak informa de este problema: objeto sin referencia 0xffff88817139d000 (tama\u00f1o 2048): comm \"test_progs\", pid 33246, jiffies 4307381979 (edad 45851.820s) volcado hexadecimal (primeros 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [\u0026lt;0000000045f075f0\u0026gt;] kmalloc_trace+0x27/0xa0 [\u0026lt;0000000098b7c90a\u0026gt;] __check_func_call+0x316/0x1230 [\u0026lt;00000000b4c3c403\u0026gt;] check_helper_call+0x172e/0x4700 [\u0026lt;00000000aa3875b7\u0026gt;] do_check+0x21d8/0x45e0 [\u0026lt;000000001147357b\u0026gt;] do_check_common+0x767/0xaf0 [\u0026lt;00000000b5a595b4\u0026gt;] bpf_check+0x43e3/0x5bc0 [\u0026lt;0000000011e391b1\u0026gt;] bpf_prog_load+0xf26/0x1940 [\u0026lt;0000000007f765c0\u0026gt;] __sys_bpf+0xd2c/0x3650 [\u0026lt;00000000839815d6\u0026gt;] __x64_sys_bpf+0x75/0xc0 [\u0026lt;00000000946ee250\u0026gt;] do_syscall_64+0x3b/0x90 [\u0026lt;0000000000506b7f\u0026gt;] entry_SYSCALL_64_after_hwframe+0x63/0xcd El caso ra\u00edz aqu\u00ed es: En la funci\u00f3n prepare_func_exit(), el llamado no se libera en el escenario anormal despu\u00e9s de \"state-\u0026gt;curframe--;\". Para solucionarlo, mueva \"state-\u0026gt;curframe--;\" al final de la funci\u00f3n, justo cuando liberamos al destinatario y restablecemos el puntero frame[] a NULL, como sugiri\u00f3 Andrii. Adem\u00e1s, la funci\u00f3n __check_func_call() presenta un problema similar. En el escenario anormal anterior a \"state-\u0026gt;curframe++;\", el destinatario tambi\u00e9n deber\u00eda ser liberado por free_func_state()."
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              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T18:44:05+00:00",
      "cve": "CVE-2022-49837",
      "id": "CVE-2022-49837",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix memory leaks in __check_func_call",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49837.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-11T16:53:06Z",
      "cve": "CVE-2022-49837",
      "id": "CVE-2022-49837",
      "initial_release_date": "2025-05-03T02:53:24Z",
      "product_status:known_affected": "499",
      "product_status:known_not_affected": "319",
      "product_status:recommended": "121",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49837",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49837.json",
      "version": "35"
    },
    "vulnrichment": {
      "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-2022-49837",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T17:02:23.476033Z",
                    "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": "2025-10-01T14:34:29.567Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "kernel/bpf/verifier.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "d4944497827a3d14bc5a26dbcfb7433eb5a956c0",
                  "status": "affected",
                  "version": "fd978bf7fd312581a7ca454a991f0ffb34c4204b",
                  "versionType": "git"
                },
                {
                  "lessThan": "83946d772e756734a900ef99dbe0aeda506adf37",
                  "status": "affected",
                  "version": "fd978bf7fd312581a7ca454a991f0ffb34c4204b",
                  "versionType": "git"
                },
                {
                  "lessThan": "eb86559a691cea5fa63e57a03ec3dc9c31e97955",
                  "status": "affected",
                  "version": "fd978bf7fd312581a7ca454a991f0ffb34c4204b",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "kernel/bpf/verifier.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.20"
                },
                {
                  "lessThan": "4.20",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.80",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.0.*",
                  "status": "unaffected",
                  "version": "6.0.10",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.1",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.80",
                      "versionStartIncluding": "4.20",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.0.10",
                      "versionStartIncluding": "4.20",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1",
                      "versionStartIncluding": "4.20",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memory leaks in __check_func_call\n\nkmemleak reports this issue:\n\nunreferenced object 0xffff88817139d000 (size 2048):\n  comm \"test_progs\", pid 33246, jiffies 4307381979 (age 45851.820s)\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003c0000000045f075f0\u003e] kmalloc_trace+0x27/0xa0\n    [\u003c0000000098b7c90a\u003e] __check_func_call+0x316/0x1230\n    [\u003c00000000b4c3c403\u003e] check_helper_call+0x172e/0x4700\n    [\u003c00000000aa3875b7\u003e] do_check+0x21d8/0x45e0\n    [\u003c000000001147357b\u003e] do_check_common+0x767/0xaf0\n    [\u003c00000000b5a595b4\u003e] bpf_check+0x43e3/0x5bc0\n    [\u003c0000000011e391b1\u003e] bpf_prog_load+0xf26/0x1940\n    [\u003c0000000007f765c0\u003e] __sys_bpf+0xd2c/0x3650\n    [\u003c00000000839815d6\u003e] __x64_sys_bpf+0x75/0xc0\n    [\u003c00000000946ee250\u003e] do_syscall_64+0x3b/0x90\n    [\u003c0000000000506b7f\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root case here is: In function prepare_func_exit(), the callee is\nnot released in the abnormal scenario after \"state-\u003ecurframe--;\". To\nfix, move \"state-\u003ecurframe--;\" to the very bottom of the function,\nright when we free callee and reset frame[] pointer to NULL, as Andrii\nsuggested.\n\nIn addition, function __check_func_call() has a similar problem. In\nthe abnormal scenario before \"state-\u003ecurframe++;\", the callee also\nshould be released by free_func_state()."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T08:46:34.749Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/d4944497827a3d14bc5a26dbcfb7433eb5a956c0"
            },
            {
              "url": "https://git.kernel.org/stable/c/83946d772e756734a900ef99dbe0aeda506adf37"
            },
            {
              "url": "https://git.kernel.org/stable/c/eb86559a691cea5fa63e57a03ec3dc9c31e97955"
            }
          ],
          "title": "bpf: Fix memory leaks in __check_func_call",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49837",
        "datePublished": "2025-05-01T14:09:54.141Z",
        "dateReserved": "2025-05-01T14:05:17.229Z",
        "dateUpdated": "2025-10-01T17:02:27.099Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.