CVE-2026-72233 (GCVE-0-2026-72233)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:41
VLAI
Title
batman-adv: bla: reacquire gw address after skb realloc
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: reacquire gw address after skb realloc The pskb_may_pull() called by batadv_bla_is_backbone_gw() 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: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < 41819c5467b6eb8ab4567f0ac98702ce9b6abbb1 (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < 4a6673c55752a7aa41e28f51660eb981504ca088 (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < ab2bac47a02637df1128a151e81d3ec14767f4bb (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < dc16bbf53cede1baf564bf0c8a861114b64e18b3 (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < e5e18886aadd3870e2d84e32a9678317fab1dd9e (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf (git)
Affected: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 , < cdf3b5af2bc4431e58629e8ad2086b1e9185c761 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (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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{
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          "product": "Linux",
          "programFiles": [
            "net/batman-adv/routing.c"
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionStartIncluding": "4.12",
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.12",
                  "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\nbatman-adv: bla: reacquire gw address after skb realloc\n\nThe pskb_may_pull() called by batadv_bla_is_backbone_gw() could reallocate\nthe buffer behind the skb. Variables which were pointing to the old buffer\nneed to be reassigned 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 in batadv_recv_unicast_packet() when batman-adv ETH_P_BATMAN frames are received on a mesh hard interface via batadv_batman_skb_recv(); exploitation requires a peer on the same wireless/bridged mesh segment (community, industrial, or gateway meshes), matching adjacent Wi-Fi/L2 reachability rather than arbitrary Internet routing.\nAC:L - An on-mesh attacker fully controls the injected unicast skb (headers, VLAN tagging) to make batadv_bla_is_backbone_gw()\u0027s pskb_may_pull() reallocate the buffer; this is a deterministic use-after-free with no victim-timed race or layout the attacker cannot influence by resending crafted frames.\nPR:N - No account or capability on the victim host is required; any unauthenticated mesh participant (or L2 source spoofer on the mesh/backbone) can send batman-adv unicast packets destined to the victim\u0027s MAC through the normal RX handler without local login or CAP_NET_ADMIN on the target.\nUI:N - The vulnerable path runs automatically in softirq when the mesh interface receives qualifying unicast traffic; the victim operator does not need to mount a filesystem, click a link, or perform any deliberate action beyond running an active batman-adv mesh with bridge loop avoidance enabled.\nS:U - Exploitation corrupts or reads kernel heap memory inside the batman-adv RX path on the same host; it does not cross a VM/hypervisor, container, or IOMMU security boundary to impact a different authority\u0027s resources.\nC:H - After pskb_may_pull() frees the old skb head, the stale orig_addr_gw pointer is read through %pM in batadv_dbg(), constituting a kernel slab use-after-free that can disclose adjacent freed-object contents and is scored as arbitrary-read class per UAF guidance.\nI:H - Use-after-free of skb linear data is heap memory corruption; even though the immediate stale access is for logging, UAF on RX skbs enables spray/reuse of the freed buffer for control of subsequent kernel objects and potential write primitives.\nA:H - Dereferencing a freed skb buffer in interrupt/RX context can trigger KASAN slab-use-after-free reports, kernel oops, or panic on affected builds; any exploitable UAF on the packet receive path is rated high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:41:50.777Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/41819c5467b6eb8ab4567f0ac98702ce9b6abbb1"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a6673c55752a7aa41e28f51660eb981504ca088"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab2bac47a02637df1128a151e81d3ec14767f4bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc16bbf53cede1baf564bf0c8a861114b64e18b3"
        },
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        {
          "url": "https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761"
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      "title": "batman-adv: bla: reacquire gw address after skb realloc",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72233",
    "datePublished": "2026-08-15T05:54:23.663Z",
    "dateReserved": "2026-08-09T03:40:39.913Z",
    "dateUpdated": "2026-08-17T05:41:50.777Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72233",
      "date": "2026-08-26",
      "epss": "0.00335",
      "percentile": "0.26044"
    },
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Variables which were pointing to the old buffer\\nneed to be reassigned to avoid an use-after-free.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/routing.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"41819c5467b6eb8ab4567f0ac98702ce9b6abbb1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"4a6673c55752a7aa41e28f51660eb981504ca088\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"ab2bac47a02637df1128a151e81d3ec14767f4bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"dc16bbf53cede1baf564bf0c8a861114b64e18b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"e5e18886aadd3870e2d84e32a9678317fab1dd9e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9e794b6bf4a2c65d698d7433ddfabc54a5d53a88\",\"lessThan\":\"cdf3b5af2bc4431e58629e8ad2086b1e9185c761\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/routing.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.12\",\"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/41819c5467b6eb8ab4567f0ac98702ce9b6abbb1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a6673c55752a7aa41e28f51660eb981504ca088\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab2bac47a02637df1128a151e81d3ec14767f4bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc16bbf53cede1baf564bf0c8a861114b64e18b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5e18886aadd3870e2d84e32a9678317fab1dd9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T17:32:39+00:00",
      "cve": "CVE-2026-72233",
      "id": "CVE-2026-72233",
      "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: bla: reacquire gw address after skb realloc",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72233.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

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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.