CVE-2026-80601 (GCVE-0-2026-80601)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-10-16 19:26
VLAI
Title
batman-adv: gw: acquire ethernet header only after skb realloc
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: gw: acquire ethernet header only after skb realloc The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/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 19:18 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < 2760b38222c8828b075802342fe3b91eb823d542 (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < 6c37f1166549c999ccd164b0cb6462d1ae68f8f6 (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < b79884a5567bf788fb76c30832467cf6a56f3c0d (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < afac8096bde4948e3caa7e4dd733867cfbd3018e (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < e3f4325e35dd6e76b80665f3510738ce34819753 (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < e6b43acd34b219b807e65096ce207b087942779d (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < 916dac5f2944f63f07f7b501acbea6737dbbed0e (git)
Affected: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 , < 77880a3be88d378d60cc1e8f8ec70430e2ed0518 (git)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (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: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T16:11:29+00:00",
      "cve": "CVE-2026-80601",
      "id": "CVE-2026-80601",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: gw: acquire ethernet header only after skb realloc",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80601.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-80601",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T19:18:26.470737Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T19:18:27.531Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "versionType": "git"
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                },
                {
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                  "status": "affected",
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                  "versionType": "git"
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                  "status": "affected",
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                  "versionType": "git"
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              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/batman-adv/gateway_client.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.14"
                },
                {
                  "lessThan": "3.14",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.261",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.212",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.178",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.145",
                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
                  "version": "6.12.97",
                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
                  "version": "6.18.40",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.1.*",
                  "status": "unaffected",
                  "version": "7.1.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.261",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.212",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                      "vulnerable": true
                    },
                    {
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                    {
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                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                      "vulnerable": true
                    },
                    {
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                      "versionEndExcluding": "7.1.5",
                      "versionStartIncluding": "3.14",
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                    },
                    {
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                      "versionEndExcluding": "7.2",
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                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: gw: acquire ethernet header only after skb realloc\n\nThe pskb_may_pull() called by batadv_get_vid() could reallocate the buffer\nbehind the skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:A - The bug is hit only in batadv_interface_tx on outgoing bat0 traffic; the highest-impact path is an unauthenticated client on the same WiFi/LAN segment bridged to a batman-adv gateway node sending a crafted VLAN-tagged DHCP packet into bat0.\nAC:L - Triggering is synchronous and attacker-controlled: a VLAN-tagged DHCP discover/request shaped to force pskb_may_pull() skb reallocation deterministically hits the stale ethhdr UAF without races or victim-specific timing.\nPR:N - No privileges on the mesh router are required when a client on a bridged WiFi/LAN port injects the malicious DHCP frame; gateway-client mode is operator configuration, not an attacker privilege.\nUI:N - Exploitation requires no victim interaction beyond normal always-on mesh bridging and DHCP forwarding; the attacker only sends a malicious frame.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same kernel/host security boundary, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a use-after-free read: after skb reallocation, ethhdr-\u003eh_source/h_dest dereference freed skb head memory, enabling uncontrolled kernel memory disclosure and further exploitation primitives.\nI:H - UAF on skb data can corrupt routing lookups (batadv_transtable_search) and adjacent kernel heap state, providing a standard path to controlled writes and arbitrary kernel code execution.\nA:H - Reading freed skb memory via ethhdr commonly causes kernel oops/panic on the batman-adv gateway node, yielding complete loss of mesh connectivity and host availability."
                }
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            "dateUpdated": "2026-08-29T06:21:13.415Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            },
            {
              "url": "https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6"
            },
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            },
            {
              "url": "https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518"
            }
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          "title": "batman-adv: gw: acquire ethernet header only after skb realloc",
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      "cveMetadata": {
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-80601",
        "datePublished": "2026-08-28T06:48:27.948Z",
        "dateReserved": "2026-08-26T14:34:25.771Z",
        "dateUpdated": "2026-10-16T19:26:29.891Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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