Vulnerability-Lookup

FKIE_CVE-2026-64413

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-09-04 15:26

Severity

7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	7.2
linux	linux_kernel	7.2

JSON

To clipboard

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: zero chainstack array\n\nsashiko reports:\n looking at ebtables table\n translation, could a sparse cpu_possible_mask lead to an uninitialized pointer\n free?\n\n If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible,\n but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at\n CPU 2, the cleanup loop will blindly decrement and call vfree() on\n newinfo-\u003echainstack[1].\n\nNot a real-world bug, such allocation isn\u0027t expected to fail\nin the first place."
    }
  ],
  "id": "CVE-2026-64413",
  "lastModified": "2026-09-04T15:26:22.170",
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        "cvssData": {
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          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-64413 (GCVE-0-2026-64413)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:55

Title

netfilter: ebtables: zero chainstack array

Summary

Severity

7 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/2ade612967e2cdfb9…
https://git.kernel.org/stable/c/42bef500d07b5769d…
https://git.kernel.org/stable/c/fc7f105451044501a…
https://git.kernel.org/stable/c/9e6c5169db423e51d…
https://git.kernel.org/stable/c/29bf41a9b59aff9f6…
https://git.kernel.org/stable/c/9f74d28e903fa4fdf…
https://git.kernel.org/stable/c/5ee856e4208acafaa…
https://git.kernel.org/stable/c/cbfe53599eebffd18…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2ade612967e2cdfb9290ebcb773f302c82f311fa (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 42bef500d07b5769d916e9122a3e3fa3fd2245ef (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fc7f105451044501a50cfd530cfa3b472c54acbc (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9e6c5169db423e51dcc66a73fd15409c0d38e088 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 29bf41a9b59aff9f6197df58641a00037d567ca8 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9f74d28e903fa4fdf82f870d0aeadddc8196e41c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ee856e4208acafaaaf7b84824d39b78c21345d6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cbfe53599eebffd188938ab6774cc41794f6f9d5 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "net/bridge/netfilter/ebtables.c"
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: zero chainstack array\n\nsashiko reports:\n looking at ebtables table\n translation, could a sparse cpu_possible_mask lead to an uninitialized pointer\n free?\n\n If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible,\n but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at\n CPU 2, the cleanup loop will blindly decrement and call vfree() on\n newinfo-\u003echainstack[1].\n\nNot a real-world bug, such allocation isn\u0027t expected to fail\nin the first place."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable translation path is reached through a local SOL_IP setsockopt(EBT_SO_SET_ENTRIES) call on an IPv4 socket, not through received network traffic.\nAC:H - Exploitation requires a boot-fixed sparse cpu_possible_mask and a per-CPU vmalloc failure after an earlier allocation succeeds. Although memory pressure is attacker-influenceable, these uncommon conditions are not fully attacker-controlled.\nPR:L - The path requires CAP_NET_ADMIN in the socket network namespace, which an unprivileged user can obtain through an owned user and network namespace where unprivileged user namespaces are enabled.\nUI:N - The attacker directly submits the crafted ebtables replacement; no victim action is required.\nS:U - This is ordinary user-namespace-to-kernel privilege escalation within the host security authority, without crossing a VM, hypervisor, or IOMMU boundary.\nC:H - The uninitialized slot can alias a live vmalloc allocation, causing it to be freed and leaving its owner with a groomable use-after-free capable of exposing arbitrary kernel memory.\nI:H - Freeing a live vmalloc-backed kernel object can enable controlled reallocation, arbitrary memory modification, and kernel control-flow hijacking.\nA:H - An invalid vfree can panic kernels configured with panic_on_warn, while freeing a live allocation creates a use-after-free that can crash or panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:12.351Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088"
        },
        {
          "url": "https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5"
        }
      ],
      "title": "netfilter: ebtables: zero chainstack array",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64413",
    "datePublished": "2026-07-25T08:50:53.759Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-08-17T04:55:12.351Z",
    "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.

Action not permitted

FKIE_CVE-2026-64413

CVE-2026-64413 (GCVE-0-2026-64413)

Tags

Sightings

Nomenclature