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

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-29 06:21
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
Assigner
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/gateway_client.c"
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              "version": "0",
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              "version": "5.10.261",
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            {
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              "version": "5.15.212",
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            },
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            {
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "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:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionStartIncluding": "3.14",
                  "vulnerable": true
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                  "versionStartIncluding": "3.14",
                  "vulnerable": true
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.14",
                  "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:13.415Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753"
        },
        {
          "url": "https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d"
        },
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          "url": "https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e"
        },
        {
          "url": "https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518"
        }
      ],
      "title": "batman-adv: gw: acquire ethernet header only after skb realloc",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80601",
    "datePublished": "2026-08-28T06:48:27.948Z",
    "dateReserved": "2026-08-26T14:34:25.771Z",
    "dateUpdated": "2026-08-29T06:21:13.415Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80601",
      "date": "2026-09-01",
      "epss": "0.00258",
      "percentile": "0.17275"
    },
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Variables which were pointing to the old buffer need to be\\nreassigned to avoid an use-after-free.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/gateway_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"2760b38222c8828b075802342fe3b91eb823d542\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"6c37f1166549c999ccd164b0cb6462d1ae68f8f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"b79884a5567bf788fb76c30832467cf6a56f3c0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"afac8096bde4948e3caa7e4dd733867cfbd3018e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"e3f4325e35dd6e76b80665f3510738ce34819753\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"e6b43acd34b219b807e65096ce207b087942779d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"916dac5f2944f63f07f7b501acbea6737dbbed0e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9\",\"lessThan\":\"77880a3be88d378d60cc1e8f8ec70430e2ed0518\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/gateway_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    }
  }
}



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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.