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batman-adv: bla: fix freeing of claims on meshif deletion

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: fix freeing of claims on meshif deletion When the mesh interface is getting deleted, then batadv_bla_del_backbone_claims() (via batadv_bla_purge_backbone_gw()) could make sure that all claims gets removed. But this function is only executed when bat_priv->bla.claim_hash is not NULL. And since batadv_bla_free() is always setting it to NULL before it is (indirectly) called, it was never actually executed. But the batadv_bla_purge_claims() -> batadv_handle_unclaim() is at the moment too fragile because the BLA code is not handling the rehashing in batadv_bla_update_orig_address(). The stored backbone address doesn't have to be the one actually used for the hash bucket selection during the initial adding of the backbone. The batadv_handle_unclaim() can therefore fail to find the respective backbone for the unclaim and then stop the deletion. But the actual backbone_gw object is not needed for the unclaim because all relevant information is always provided by the caller. And the check for the existence of the backbone_gw doesn't provide any additional security check for the deletion of a claim.

Announced Source revision 1
Original source ↗

CVE-2026-89948

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89948

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "844a95a734f178d56c7acce14c5cce2cecff7e1a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "baeb1a28fd8e2f68193650d3664a8cd1adfd85c6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "aacffa780a37e06cd5a13d33740a6e96c3a67e6c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "76aedcde5a2489cc971d4d1e396e784a49565e96",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "f50edb69082a8ba990cc23d642089829f99afe6a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "871acdf97f64cee8398f72b88b89e8b4f4816dbe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "9a0c47023d3254048a1588534755d4476bcc3abc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
        "lessThan": "8d128c932bced74e3b1625ba3d7c78ef122a88a7",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/batman-adv/bridge_loop_avoidance.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/batman-adv/bridge_loop_avoidance.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89948

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36388 · Revision 1
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