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CVE-2026-23001 (GCVE-0-2026-23001)

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-08-05 12:20
VLAI
Title
macvlan: fix possible UAF in macvlan_forward_source()
Summary
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u
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 2026-06-16 20:17 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 8133e85b8a3ec9f10d861e0002ec6037256e987e (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 484919832e2db6ce1e8add92c469e5d459a516b5 (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 232afc74a6dde0fe1830988e5827921f5ec9bb3f (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 15f6faf36e162532bec5cc05eb3fc622108bf2ed (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 8518712a2ca952d6da2238c6f0a16b4ae5ea3f13 (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 6dbead9c7677186f22b7981dd085a0feec1f038e (git)
Affected: 79cf79abce71eb7dbc40e2f3121048ca5405cb47 , < 7470a7a63dc162f07c26dbf960e41ee1e248d80e (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmacvlan: soluciona posible UAF en macvlan_forward_source()\n\nA\u00f1ade protecci\u00f3n RCU en (struct macvlan_source_entry)-\u0026gt;vlan.\n\nSiempre que se llama a macvlan_hash_del_source(), debemos borrar el puntero entry-\u0026gt;vlan antes de que comience el per\u00edodo de gracia de RCU.\n\nEsto permite a macvlan_forward_source() omitir entradas en cola para ser liberadas.\n\nTenga en cuenta que macvlan_dev ya est\u00e1n protegidos por RCU, ya que est\u00e1n incrustados en un netdev est\u00e1ndar (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u"
          }
        ],
        "id": "CVE-2026-23001",
        "lastModified": "2026-06-17T10:20:41.110",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
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                "scope": "UNCHANGED",
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              "source": "nvd@nist.gov",
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          "ssvcV203": [
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                "options": [
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                  {
                    "technicalImpact": "total"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-16T20:17:12.456069Z",
                "version": "2.0.3"
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        "published": "2026-01-25T15:15:54.970",
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          {
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-11T22:37:40+00:00",
      "cve": "CVE-2026-23001",
      "id": "CVE-2026-23001",
      "initial_release_date": "2026-01-25T00:00:00+00:00",
      "product_status:fixed": "2190",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: macvlan: fix possible UAF in macvlan_forward_source()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23001.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-06T01:27:18Z",
      "cve": "CVE-2026-23001",
      "id": "CVE-2026-23001",
      "initial_release_date": "2026-01-26T00:24:44Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "428",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "742",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23001",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23001.json",
      "version": "40"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-23001",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-16T20:17:12.456069Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-16T20:17:21.431Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/macvlan.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "8133e85b8a3ec9f10d861e0002ec6037256e987e",
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                {
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            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/macvlan.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
                  "version": "3.18"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "5.10.249",
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                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.199",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.162",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.122",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.67",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.7",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.19",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.249",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
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                      "versionEndExcluding": "5.15.199",
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                      "vulnerable": true
                    },
                    {
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                    {
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                      "vulnerable": true
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                      "versionEndExcluding": "6.19",
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                      "vulnerable": true
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                  "negate": false,
                  "operator": "OR"
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix possible UAF in macvlan_forward_source()\n\nAdd RCU protection on (struct macvlan_source_entry)-\u003evlan.\n\nWhenever macvlan_hash_del_source() is called, we must clear\nentry-\u003evlan pointer before RCU grace period starts.\n\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\n\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u"
            }
          ],
          "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 reliable attacker-controlled path requires local rtnetlink manipulation of macvlan source-mode entries or failed macvlan creation, followed by local packet injection through a lower device such as veth/tun. Received frames reach the buggy RX handler, but creating the vulnerable stale source entry is a local operation.\nAC:L - The attacker can create the macvlan/source-entry state and trigger packet delivery repeatedly; the demonstrated stale-entry case is deterministic, and source-entry deletion races are attacker-controllable with concurrent netlink and packet activity.\nPR:L - The setup path requires CAP_NET_ADMIN for RTM_NEWLINK/RTM_SETLINK/RTM_DELLINK, but this is reachable by an unprivileged local user in a user-created user/net namespace on systems allowing user namespaces. It does not require real init-namespace root.\nUI:N - No victim action is required once the local attacker runs the netlink operations and injects matching frames. Exploitation is driven entirely by attacker-controlled local processes.\nS:U - The vulnerability corrupts or dereferences memory within the same kernel security authority. It is a standard kernel memory-safety issue, not a VM escape or cross-scope boundary violation.\nC:H - This is a use-after-free involving a freed macvlan/net_device-private object, and reclaimed heap contents can be exposed or used as attacker-shaped kernel pointers. Per kernel CVSS guidance, UAFs are scored as high confidentiality impact.\nI:H - The freed object is later used as a live macvlan_dev and passed into forwarding/statistics paths, giving plausible control-flow or write-primitive opportunities after heap reclaim. Per kernel CVSS guidance, UAF memory corruption is high integrity impact.\nA:H - Syzbot observed a KASAN slab-use-after-free in macvlan_forward_source(), and the bug can crash or panic the kernel. A kernel UAF reachable on demand is high availability impact."
                }
              ]
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            "dateUpdated": "2026-08-05T12:20:04.510Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            },
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            },
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      "cveMetadata": {
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-23001",
        "datePublished": "2026-01-25T14:36:15.790Z",
        "dateReserved": "2026-01-13T15:37:45.938Z",
        "dateUpdated": "2026-08-05T12:20:04.510Z",
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}



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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.