Vulnerability-Lookup

GHSA-P39F-F66F-X437

Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-05-07 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf, verifier: Fix memory leak in array reallocation for stack state

If an error (NULL) is returned by krealloc(), callers of realloc_array() were setting their allocation pointers to NULL, but on error krealloc() does not touch the original allocation. This would result in a memory resource leak. Instead, free the old allocation on the error handling path.

The memory leak information is as follows as also reported by Zhengchao:

unreferenced object 0xffff888019801800 (size 256): comm "bpf_repo", pid 6490, jiffies 4294959200 (age 17.170s) hex dump (first 32 bytes): 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: [<00000000b211474b>] __kmalloc_node_track_caller+0x45/0xc0 [<0000000086712a0b>] krealloc+0x83/0xd0 [<00000000139aab02>] realloc_array+0x82/0xe2 [<00000000b1ca41d1>] grow_stack_state+0xfb/0x186 [<00000000cd6f36d2>] check_mem_access.cold+0x141/0x1341 [<0000000081780455>] do_check_common+0x5358/0xb350 [<0000000015f6b091>] bpf_check.cold+0xc3/0x29d [<000000002973c690>] bpf_prog_load+0x13db/0x2240 [<00000000028d1644>] __sys_bpf+0x1605/0x4ce0 [<00000000053f29bd>] __x64_sys_bpf+0x75/0xb0 [<0000000056fedaf5>] do_syscall_64+0x35/0x80 [<000000002bd58261>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2022-49878"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:12Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, verifier: Fix memory leak in array reallocation for stack state\n\nIf an error (NULL) is returned by krealloc(), callers of realloc_array()\nwere setting their allocation pointers to NULL, but on error krealloc()\ndoes not touch the original allocation. This would result in a memory\nresource leak. Instead, free the old allocation on the error handling\npath.\n\nThe memory leak information is as follows as also reported by Zhengchao:\n\n  unreferenced object 0xffff888019801800 (size 256):\n  comm \"bpf_repo\", pid 6490, jiffies 4294959200 (age 17.170s)\n  hex dump (first 32 bytes):\n    00 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    [\u003c00000000b211474b\u003e] __kmalloc_node_track_caller+0x45/0xc0\n    [\u003c0000000086712a0b\u003e] krealloc+0x83/0xd0\n    [\u003c00000000139aab02\u003e] realloc_array+0x82/0xe2\n    [\u003c00000000b1ca41d1\u003e] grow_stack_state+0xfb/0x186\n    [\u003c00000000cd6f36d2\u003e] check_mem_access.cold+0x141/0x1341\n    [\u003c0000000081780455\u003e] do_check_common+0x5358/0xb350\n    [\u003c0000000015f6b091\u003e] bpf_check.cold+0xc3/0x29d\n    [\u003c000000002973c690\u003e] bpf_prog_load+0x13db/0x2240\n    [\u003c00000000028d1644\u003e] __sys_bpf+0x1605/0x4ce0\n    [\u003c00000000053f29bd\u003e] __x64_sys_bpf+0x75/0xb0\n    [\u003c0000000056fedaf5\u003e] do_syscall_64+0x35/0x80\n    [\u003c000000002bd58261\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd",
  "id": "GHSA-p39f-f66f-x437",
  "modified": "2025-05-07T15:31:25Z",
  "published": "2025-05-01T15:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49878"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06615967d4889b08b19ff3dda96e8b131282f73d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e210891c4a4c2d858cd6f9f61d5809af251d4df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42378a9ca55347102bbf86708776061d8fe3ece2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49878 (GCVE-0-2022-49878)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-05-11 19:08

Title

bpf, verifier: Fix memory leak in array reallocation for stack state

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf, verifier: Fix memory leak in array reallocation for stack state If an error (NULL) is returned by krealloc(), callers of realloc_array() were setting their allocation pointers to NULL, but on error krealloc() does not touch the original allocation. This would result in a memory resource leak. Instead, free the old allocation on the error handling path. The memory leak information is as follows as also reported by Zhengchao: unreferenced object 0xffff888019801800 (size 256): comm "bpf_repo", pid 6490, jiffies 4294959200 (age 17.170s) hex dump (first 32 bytes): 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: [<00000000b211474b>] __kmalloc_node_track_caller+0x45/0xc0 [<0000000086712a0b>] krealloc+0x83/0xd0 [<00000000139aab02>] realloc_array+0x82/0xe2 [<00000000b1ca41d1>] grow_stack_state+0xfb/0x186 [<00000000cd6f36d2>] check_mem_access.cold+0x141/0x1341 [<0000000081780455>] do_check_common+0x5358/0xb350 [<0000000015f6b091>] bpf_check.cold+0xc3/0x29d [<000000002973c690>] bpf_prog_load+0x13db/0x2240 [<00000000028d1644>] __sys_bpf+0x1605/0x4ce0 [<00000000053f29bd>] __x64_sys_bpf+0x75/0xb0 [<0000000056fedaf5>] do_syscall_64+0x35/0x80 [<000000002bd58261>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

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 16:02 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/06615967d4889b08b…
https://git.kernel.org/stable/c/3e210891c4a4c2d85…
https://git.kernel.org/stable/c/42378a9ca55347102…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c69431aab67a912836e5831f03d99a819c14c9c3 , < 06615967d4889b08b19ff3dda96e8b131282f73d (git) Affected: c69431aab67a912836e5831f03d99a819c14c9c3 , < 3e210891c4a4c2d858cd6f9f61d5809af251d4df (git) Affected: c69431aab67a912836e5831f03d99a819c14c9c3 , < 42378a9ca55347102bbf86708776061d8fe3ece2 (git)
Linux	Linux	Affected: 5.14 Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.79 , ≤ 5.15.* (semver) Unaffected: 6.0.9 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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-2022-49878",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T16:02:47.368598Z",
                "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": "2025-10-01T16:02:49.951Z",
          "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": "06615967d4889b08b19ff3dda96e8b131282f73d",
              "status": "affected",
              "version": "c69431aab67a912836e5831f03d99a819c14c9c3",
              "versionType": "git"
            },
            {
              "lessThan": "3e210891c4a4c2d858cd6f9f61d5809af251d4df",
              "status": "affected",
              "version": "c69431aab67a912836e5831f03d99a819c14c9c3",
              "versionType": "git"
            },
            {
              "lessThan": "42378a9ca55347102bbf86708776061d8fe3ece2",
              "status": "affected",
              "version": "c69431aab67a912836e5831f03d99a819c14c9c3",
              "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": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.79",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.9",
              "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": "5.15.79",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.9",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, verifier: Fix memory leak in array reallocation for stack state\n\nIf an error (NULL) is returned by krealloc(), callers of realloc_array()\nwere setting their allocation pointers to NULL, but on error krealloc()\ndoes not touch the original allocation. This would result in a memory\nresource leak. Instead, free the old allocation on the error handling\npath.\n\nThe memory leak information is as follows as also reported by Zhengchao:\n\n  unreferenced object 0xffff888019801800 (size 256):\n  comm \"bpf_repo\", pid 6490, jiffies 4294959200 (age 17.170s)\n  hex dump (first 32 bytes):\n    00 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    [\u003c00000000b211474b\u003e] __kmalloc_node_track_caller+0x45/0xc0\n    [\u003c0000000086712a0b\u003e] krealloc+0x83/0xd0\n    [\u003c00000000139aab02\u003e] realloc_array+0x82/0xe2\n    [\u003c00000000b1ca41d1\u003e] grow_stack_state+0xfb/0x186\n    [\u003c00000000cd6f36d2\u003e] check_mem_access.cold+0x141/0x1341\n    [\u003c0000000081780455\u003e] do_check_common+0x5358/0xb350\n    [\u003c0000000015f6b091\u003e] bpf_check.cold+0xc3/0x29d\n    [\u003c000000002973c690\u003e] bpf_prog_load+0x13db/0x2240\n    [\u003c00000000028d1644\u003e] __sys_bpf+0x1605/0x4ce0\n    [\u003c00000000053f29bd\u003e] __x64_sys_bpf+0x75/0xb0\n    [\u003c0000000056fedaf5\u003e] do_syscall_64+0x35/0x80\n    [\u003c000000002bd58261\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:08:29.598Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/06615967d4889b08b19ff3dda96e8b131282f73d"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e210891c4a4c2d858cd6f9f61d5809af251d4df"
        },
        {
          "url": "https://git.kernel.org/stable/c/42378a9ca55347102bbf86708776061d8fe3ece2"
        }
      ],
      "title": "bpf, verifier: Fix memory leak in array reallocation for stack state",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49878",
    "datePublished": "2025-05-01T14:10:26.389Z",
    "dateReserved": "2025-05-01T14:05:17.239Z",
    "dateUpdated": "2026-05-11T19:08:29.598Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.