CVE-2026-46238 (GCVE-0-2026-46238)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:41 – Updated: 2026-08-05 12:30
VLAI
Title
batman-adv: stop caching unowned originator pointers in BAT IV
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop caching unowned originator pointers in BAT IV BAT IV keeps the last-hop neighbor address in each neigh_node, but some paths also cache an originator pointer derived from a temporary lookup. That pointer is not owned by the neigh_node and may no longer refer to a live originator entry after purge handling runs. Stop storing the auxiliary originator pointer in the BAT IV neighbor state. When BAT IV needs the neighbor originator data, resolve it from the stored neighbor address and drop the reference again after use. [sven: avoid bonding logic for outgoing OGM]
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 86b2b58d7c228d850c8c78e4144e6123e8ed2718 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 384e3050a42be9085d50507b4d5f8266a588d742 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 8c16c68fdbb69778f8d04f650340c3f4d1518f8e (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < aafcbaf1159ea224528ca4075d0ba8c10ef374af (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 6e20700f8c524ac379ba8274ff5d453023b7c006 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 09dc0d1a12222ffca6481916eab3cfea477b9620 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 67bceeb22207f1f5a402973a3a0809e5f2698f38 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < f03e8583532941b07761c5429de7d50766fa3110 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.90 , ≤ 6.12.* (semver)
Unaffected: 6.18.32 , ≤ 6.18.* (semver)
Unaffected: 7.0.9 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Show details on NVD website

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              "value": "AV:A - batman-adv OGMs are raw layer-2 broadcast management frames (ethertype 0x4305) confined to the mesh segment; the attacker must be on the same WiFi/ad-hoc or wired link-layer mesh as the victim, matching the Adjacent vector for mesh/WiFi frame injection.\nAC:L - The attacker controls all OGM traffic and can deterministically set up the freed-originator condition (purge timeout is fixed and purge work runs every second) before triggering the dereference, so no uncontrollable race is involved.\nPR:N - batman-adv OGM/management packets are unauthenticated with no privilege check; any node able to put frames on the mesh segment can inject them.\nUI:N - No victim interaction is required \u2014 the vulnerable BAT IV OGM processing runs automatically on any node running batman-adv with the default routing algorithm.\nS:U - The use-after-free is contained within the kernel\u0027s own memory/security context with no crossing of a trust or virtualization boundary.\nC:H - The UAF dereferences a freed originator object that can be reallocated with attacker-controlled heap content, enabling kernel memory disclosure.\nI:H - The stale pointer is used for spinlock acquisition and field access on freed memory; UAF of a heap object enables heap grooming toward an arbitrary write / control-flow primitive.\nA:H - Dereferencing the freed/dangling originator pointer reliably causes a kernel oops/panic."
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When BAT IV needs the neighbor originator data, resolve it from\\nthe stored neighbor address and drop the reference again after use.\\n\\n[sven: avoid bonding logic for outgoing OGM]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/bat_iv_ogm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"86b2b58d7c228d850c8c78e4144e6123e8ed2718\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"384e3050a42be9085d50507b4d5f8266a588d742\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"8c16c68fdbb69778f8d04f650340c3f4d1518f8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"aafcbaf1159ea224528ca4075d0ba8c10ef374af\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"6e20700f8c524ac379ba8274ff5d453023b7c006\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"09dc0d1a12222ffca6481916eab3cfea477b9620\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"67bceeb22207f1f5a402973a3a0809e5f2698f38\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\",\"lessThan\":\"f03e8583532941b07761c5429de7d50766fa3110\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/bat_iv_ogm.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\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.90\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.32\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.9\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.38\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"3996F9BB-AFBD-4DE6-9428-123431066087\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.90\",\"matchCriteriaId\":\"3BAAA2BE-6EEC-45D5-AD66-50F63CA20483\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.32\",\"matchCriteriaId\":\"CB9F1FA8-6D5E-42B1-9877-57BACFE5C886\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:41:44+00:00",
      "cve": "CVE-2026-46238",
      "id": "CVE-2026-46238",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: stop caching unowned originator pointers in BAT IV",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46238.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:53:52Z",
      "cve": "CVE-2026-46238",
      "id": "CVE-2026-46238",
      "initial_release_date": "2026-05-29T01:14:33Z",
      "product_status:known_affected": "209",
      "product_status:known_not_affected": "29",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46238",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46238.json",
      "version": "5"
    }
  }
}



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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.

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Detection rules are retrieved from Rulezet.

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