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CVE-2026-72235 (GCVE-0-2026-72235)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:41
VLAI
Title
batman-adv: retrieve ethhdr after potential skb realloc on RX
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: retrieve ethhdr after potential skb realloc on RX pskb_may_pull() in batadv_interface_rx() 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 VLAN header but missed for the ethernet header which is later used for the TT and AP isolation handling.
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: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 6e189f14d1ea28db212b9d70a02131a7ce518012 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < a1820344b180cb55af748f102bc536b5c93164db (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 6abf73589bed3f27ee240c08108feb72bed0b9c6 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < f19259395b44af67f3c274e34237c295b526b859 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 2cefa5141cab8ec1e4b24cf585958b13f2e3049d (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 85a71a81854e0e191ad0e533eabb4eff54866feb (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < b031fc97e1993d29d6c3a0e86a99140528cf31e8 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 035e1fed892d3d06002a73ff73668f618a514644 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (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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              "versionType": "original_commit_for_fix"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: retrieve ethhdr after potential skb realloc on RX\n\npskb_may_pull() in batadv_interface_rx() could reallocate the buffer behind\nthe 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 VLAN header but missed for the ethernet\nheader which is later used for the TT and AP isolation handling."
        }
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      "metrics": [
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:A - Exploitation requires delivering crafted ETH_P_BATMAN frames on the victim\u0027s batman-adv mesh hard interface (802.11/wired L2 mesh), reachable from any adjacent mesh peer without local shell access.\nAC:L - The attacker fully controls remote batman-adv packet contents (VLAN-encapsulated payload and skb layout) and can repeatedly send unicast/broadcast frames to reliably force pskb_may_pull() skb reallocation.\nPR:N - No privileges on the victim are required; any unauthenticated remote mesh participant that can inject batman-adv RX frames onto an active mesh node can reach batadv_interface_rx().\nUI:N - Exploitation is triggered solely by the attacker sending malicious mesh packets; no victim user action (mounting, clicking, or configuration changes) is needed at exploit time.\nS:U - Impact is kernel memory corruption and potential privilege escalation on the mesh node; it does not cross a VM/host, IOMMU, or sandbox security boundary.\nC:H - Stale ethhdr after skb realloc is a use-after-free read of freed skb data; attacker-influenced bytes from ethhdr-\u003eh_source/h_dest are consumed by TT and AP-isolation logic, enabling arbitrary kernel memory disclosure.\nI:H - UAF-supplied MAC data is copied into translation-table heap objects via batadv_tt_add_temporary_global_entry()/batadv_tt_global_add(), providing a memory-corruption primitive suitable for control-flow or data hijacking.\nA:H - Use-after-free on the RX path can cause kernel oops/panic from dereferencing freed skb buffer memory during TT/AP-isolation handling, even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:41:52.969Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-08-09T03:40:39.914Z",
    "dateUpdated": "2026-08-17T05:41:52.969Z",
    "state": "PUBLISHED"
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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 VLAN header but missed for the ethernet\\nheader which is later used for the TT and AP isolation handling.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/mesh-interface.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"6e189f14d1ea28db212b9d70a02131a7ce518012\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"a1820344b180cb55af748f102bc536b5c93164db\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"6abf73589bed3f27ee240c08108feb72bed0b9c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"f19259395b44af67f3c274e34237c295b526b859\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"2cefa5141cab8ec1e4b24cf585958b13f2e3049d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"85a71a81854e0e191ad0e533eabb4eff54866feb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"b031fc97e1993d29d6c3a0e86a99140528cf31e8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"035e1fed892d3d06002a73ff73668f618a514644\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/mesh-interface.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.38\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.38\",\"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/035e1fed892d3d06002a73ff73668f618a514644\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2cefa5141cab8ec1e4b24cf585958b13f2e3049d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6abf73589bed3f27ee240c08108feb72bed0b9c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e189f14d1ea28db212b9d70a02131a7ce518012\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85a71a81854e0e191ad0e533eabb4eff54866feb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1820344b180cb55af748f102bc536b5c93164db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b031fc97e1993d29d6c3a0e86a99140528cf31e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f19259395b44af67f3c274e34237c295b526b859\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T17:32:50+00:00",
      "cve": "CVE-2026-72235",
      "id": "CVE-2026-72235",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: retrieve ethhdr after potential skb realloc on RX",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72235.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.