Vulnerability-Lookup

GHSA-MCGW-CW9V-8CMP

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: access unicast_ttvn skb->data 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.

This was done correctly for the ethernet header but missed for the unicast_packet pointer.

Severity

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72234"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:50Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: access unicast_ttvn skb-\u003edata 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.\n\nThis was done correctly for the ethernet header but missed for the\nunicast_packet pointer.",
  "id": "GHSA-mcgw-cw9v-8cmp",
  "modified": "2026-08-17T06:33:18Z",
  "published": "2026-08-15T06:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72234"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72234 (GCVE-0-2026-72234)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:41

Title

batman-adv: access unicast_ttvn skb->data only after skb realloc

Summary

In the Linux kernel, the following vulnerability has been resolved: batman-adv: access unicast_ttvn skb->data 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. This was done correctly for the ethernet header but missed for the unicast_packet pointer.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/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/aa9558af859934f24…
https://git.kernel.org/stable/c/9c2c05629e46c1fd4…
https://git.kernel.org/stable/c/7b162b36de7505654…
https://git.kernel.org/stable/c/ed90eb5c68420cdfe…
https://git.kernel.org/stable/c/979175834a699ccc3…
https://git.kernel.org/stable/c/b8afcf799b2cc92c4…
https://git.kernel.org/stable/c/9a7b7248798123efb…
https://git.kernel.org/stable/c/7141990add3f75436…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < aa9558af859934f24717d4bab97d61004f91a736 (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < 9c2c05629e46c1fd43931506d41c56a885a98eb4 (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < 7b162b36de750565404cd3b98315706622c6974f (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < ed90eb5c68420cdfe67ec1f773324198d2ef6f50 (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < 979175834a699ccc3c4c0b0ba60ecae0f135a587 (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < b8afcf799b2cc92c41beebd029e53ed18960184a (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < 9a7b7248798123efbd5fafe58461d57c7cc718af (git) Affected: c018ad3de61a1dc4194879a53e5559e094aa7b1a , < 7141990add3f75436f2933cb310654cad3b1e3e9 (git)
Linux	Linux	Affected: 3.13 Unaffected: 0 , < 3.13 (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/routing.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aa9558af859934f24717d4bab97d61004f91a736",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "9c2c05629e46c1fd43931506d41c56a885a98eb4",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "7b162b36de750565404cd3b98315706622c6974f",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "ed90eb5c68420cdfe67ec1f773324198d2ef6f50",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "979175834a699ccc3c4c0b0ba60ecae0f135a587",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "b8afcf799b2cc92c41beebd029e53ed18960184a",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "9a7b7248798123efbd5fafe58461d57c7cc718af",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            },
            {
              "lessThan": "7141990add3f75436f2933cb310654cad3b1e3e9",
              "status": "affected",
              "version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/routing.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "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"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "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": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: access unicast_ttvn skb-\u003edata 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.\n\nThis was done correctly for the ethernet header but missed for the\nunicast_packet pointer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Triggered in batadv_check_unicast_ttvn() when batadv_batman_skb_recv() processes incoming BATADV unicast packets from remote mesh peers on hard interfaces; crafted batman-adv frames reach the vulnerable code over the mesh network without local system access.\nAC:L - An attacker reliably triggers the UAF by sending a batman-adv unicast packet with a VLAN-tagged embedded Ethernet header to a victim node; packet fields are attacker-controlled and can force batadv_get_vid()\u0027s pskb_may_pull() to reallocate the skb buffer.\nPR:N - No privileges are required on the victim host; exploitation only needs batman-adv active on an interface while the attacker acts as an unauthenticated mesh peer able to transmit batman-adv protocol frames to the target node.\nUI:N - No victim user interaction is needed; the kernel automatically processes the malicious batman-adv unicast packet on receive through the normal mesh routing receive path.\nS:U - The use-after-free corrupts kernel heap memory within the same host networking subsystem and does not cross VM, container, or IOMMU boundaries to impact a separate security authority.\nC:H - The stale unicast_packet pointer dereferences freed skb buffer memory for reads (unicast_packet-\u003edest, unicast_packet-\u003ettvn), constituting a kernel heap use-after-free that can disclose sensitive memory contents.\nI:H - The stale pointer is used for writes via ether_addr_copy(unicast_packet-\u003edest) and unicast_packet-\u003ettvn updates in reroute paths, enabling heap corruption and potential arbitrary kernel code execution.\nA:H - Use-after-free on the skb data buffer during batman-adv unicast processing can cause kernel oops, panic, or hang, and UAF heap corruption inherently threatens system availability even before full exploit development."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:41:51.879Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50"
        },
        {
          "url": "https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af"
        },
        {
          "url": "https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9"
        }
      ],
      "title": "batman-adv: access unicast_ttvn skb-\u003edata only after skb realloc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72234",
    "datePublished": "2026-08-15T05:54:24.395Z",
    "dateReserved": "2026-08-09T03:40:39.914Z",
    "dateUpdated": "2026-08-17T05:41:51.879Z",
    "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

GHSA-MCGW-CW9V-8CMP

CVE-2026-72234 (GCVE-0-2026-72234)

Tags

Sightings

Nomenclature