CVE-2026-63835 (GCVE-0-2026-63835)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:51
VLAI
Title
batman-adv: v: prevent OGM aggregation on disabled hardif
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: v: prevent OGM aggregation on disabled hardif When an interface gets disabled, the worker is correctly disabled by batadv_hardif_disable_interface() -> ... -> batadv_v_ogm_iface_disable(). In this process, the skb aggr_list is also freed. But batadv_v_ogm_send_meshif() can still queue new skbs (via batadv_v_ogm_queue_on_if()) to the aggr_list. This will only stop after all cores can no longer find the RCU protected list of hard interfaces. These queued skbs will never be freed or consumed by batadv_v_ogm_aggr_work. The batadv_v_ogm_iface_disable() function must block batadv_v_ogm_queue_on_if() to avoid leak of skbs.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < d462ced79dd430200cf888984e8005da77fc810b (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < f79deaaf822ab0ee2424cf28781f9ab91576bea3 (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < d3569327fc7395b2b0461a0a0cb77a0bb74786c0 (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < 97644fdaaf6446ffbe182c5eb804fceb5b1a51b7 (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < f04dde74399431fb07abbdd9cd5d0ed624771d04 (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < 3d4548c96d6f21ac1a9b06c5f82f3ef439c87023 (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < 86ab6b6fb5b82163bf6c45780bb72150021d7349 (git)
Affected: f89255a02f1d75d8e1b9d1c31435fcb64840cb2a , < d11c00b95b2a3b3934007fc003dccc6fdcc061ad (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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: v: prevent OGM aggregation on disabled hardif\n\nWhen an interface gets disabled, the worker is correctly disabled by\nbatadv_hardif_disable_interface() -\u003e ... -\u003e batadv_v_ogm_iface_disable().\nIn this process, the skb aggr_list is also freed.\n\nBut batadv_v_ogm_send_meshif() can still queue new skbs (via\nbatadv_v_ogm_queue_on_if()) to the aggr_list. This will only stop after all\ncores can no longer find the RCU protected list of hard interfaces. These\nqueued skbs will never be freed or consumed by batadv_v_ogm_aggr_work.\n\nThe batadv_v_ogm_iface_disable() function must block\nbatadv_v_ogm_queue_on_if() to avoid leak of skbs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:51:45.552Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d462ced79dd430200cf888984e8005da77fc810b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f79deaaf822ab0ee2424cf28781f9ab91576bea3"
        },
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          "url": "https://git.kernel.org/stable/c/d3569327fc7395b2b0461a0a0cb77a0bb74786c0"
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        },
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      "title": "batman-adv: v: prevent OGM aggregation on disabled hardif",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63835",
    "datePublished": "2026-07-19T12:02:26.574Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-08-17T04:51:45.552Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-22",
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      "percentile": "0.07189"
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "batman-adv: v: prevent OGM aggregation on disabled hardif",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63835.json",
      "version": "8"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: v: prevent OGM aggregation on disabled hardif\n\nWhen an interface gets disabled, the worker is correctly disabled by\nbatadv_hardif_disable_interface() -\u003e ... -\u003e batadv_v_ogm_iface_disable().\nIn this process, the skb aggr_list is also freed.\n\nBut batadv_v_ogm_send_meshif() can still queue new skbs (via\nbatadv_v_ogm_queue_on_if()) to the aggr_list. This will only stop after all\ncores can no longer find the RCU protected list of hard interfaces. These\nqueued skbs will never be freed or consumed by batadv_v_ogm_aggr_work.\n\nThe batadv_v_ogm_iface_disable() function must block\nbatadv_v_ogm_queue_on_if() to avoid leak of skbs."
          }
        ],
        "id": "CVE-2026-63835",
        "lastModified": "2026-08-17T05:17:21.483",
        "metrics": {},
        "published": "2026-07-19T12:16:56.970",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/f79deaaf822ab0ee2424cf28781f9ab91576bea3"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:07:19+00:00",
      "cve": "CVE-2026-63835",
      "id": "CVE-2026-63835",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: v: prevent OGM aggregation on disabled hardif",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63835.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:58:46Z",
      "cve": "CVE-2026-63835",
      "id": "CVE-2026-63835",
      "initial_release_date": "2026-07-19T17:34:29Z",
      "product_status:known_affected": "227",
      "product_status:known_not_affected": "147",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63835",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63835.json",
      "version": "6"
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.