CVE-2026-23412 (GCVE-0-2026-23412)

Vulnerability from cvelistv5 – Published: 2026-04-02 11:40 – Updated: 2026-10-19 18:35
VLAI
Title
netfilter: bpf: defer hook memory release until rcu readers are done
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: bpf: defer hook memory release until rcu readers are done Yiming Qian reports UaF when concurrent process is dumping hooks via nfnetlink_hooks: BUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0 Read of size 8 at addr ffff888003edbf88 by task poc/79 Call Trace: <TASK> nfnl_hook_dump_one.isra.0+0xe71/0x10f0 netlink_dump+0x554/0x12b0 nfnl_hook_get+0x176/0x230 [..] Defer release until after concurrent readers have completed.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:07 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6993 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 84601d6ee68ae820dec97450934797046d62db4b , < d016c216bc75c45128160593a77b864a04dbe7c0 (git)
Affected: 84601d6ee68ae820dec97450934797046d62db4b , < cb2bf5efdb02a2a59faf603604a1066e8266f349 (git)
Affected: 84601d6ee68ae820dec97450934797046d62db4b , < c25e0dec366ae99b7264324ce3c7cbaea34691f9 (git)
Affected: 84601d6ee68ae820dec97450934797046d62db4b , < 54244d54a971c26a0cd0a9073460ff71f3c51b32 (git)
Affected: 84601d6ee68ae820dec97450934797046d62db4b , < 24f90fa3994b992d1a09003a3db2599330a5232a (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:45:42+00:00",
      "cve": "CVE-2026-23412",
      "id": "CVE-2026-23412",
      "initial_release_date": "2026-04-02T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: bpf: defer hook memory release until rcu readers are done",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23412.json",
      "version": "3"
    },
    "vulnrichment": {
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          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-23412",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:07:44.417268Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:07:44.955Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "versionType": "git"
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                {
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                {
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                  "status": "affected",
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                  "versionType": "git"
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                {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "6.4"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.130",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.78",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.19.*",
                  "status": "unaffected",
                  "version": "6.19.10",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.78",
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                      "vulnerable": true
                    },
                    {
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                      "vulnerable": true
                    },
                    {
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                    }
                  ],
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                  "operator": "OR"
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              ]
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bpf: defer hook memory release until rcu readers are done\n\nYiming Qian reports UaF when concurrent process is dumping hooks via\nnfnetlink_hooks:\n\nBUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0\nRead of size 8 at addr ffff888003edbf88 by task poc/79\nCall Trace:\n \u003cTASK\u003e\n nfnl_hook_dump_one.isra.0+0xe71/0x10f0\n netlink_dump+0x554/0x12b0\n nfnl_hook_get+0x176/0x230\n [..]\n\nDefer release until after concurrent readers have completed."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable paths are reached through local BPF syscalls and NETLINK_NETFILTER hook dump requests, not by unauthenticated network packets alone.\nAC:L - The bug is a race between BPF netfilter link teardown and nfnetlink hook dumping, and a local attacker can control both sides by creating/destroying links while issuing dump requests.\nPR:L - The path requires local BPF/netfilter privileges such as CAP_NET_ADMIN and BPF permissions, which are reasonably reachable in user/net namespace or delegated BPF-token deployments rather than requiring real init-namespace root.\nUI:N - No victim action is needed once the attacker can run the local operations; the attacker triggers the attach/detach and dump operations directly.\nS:U - The impact is within the kernel security authority and does not cross a VM, IOMMU, or similar separate security scope.\nC:H - This is a kernel use-after-free of a netfilter hook object read under RCU after immediate link deallocation, and heap reuse can expose controlled or stale kernel pointers and data.\nI:H - As a kernel use-after-free in attacker-influenced heap memory, it is defensibly exploitable for memory corruption or control-flow manipulation under the required overestimate rule.\nA:H - The reported KASAN slab-use-after-free in nfnl_hook_dump_one can crash or panic the kernel, and repeated local triggering can cause full system denial of service."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:21:32.513Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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            },
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              "url": "https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32"
            },
            {
              "url": "https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a"
            }
          ],
          "title": "netfilter: bpf: defer hook memory release until rcu readers are done",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-23412",
        "datePublished": "2026-04-02T11:40:53.528Z",
        "dateReserved": "2026-01-13T15:37:46.013Z",
        "dateUpdated": "2026-10-19T18:35:42.715Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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