CVE-2026-97599 (GCVE-0-2026-97599)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-09-25 10:22
VLAI
Title
ieee802154: hwsim: serialize pib updates to fix double-free
Summary
In the Linux kernel, the following vulnerability has been resolved: ieee802154: hwsim: serialize pib updates to fix double-free hwsim_update_pib() does an unserialized read-swap-free of phy->pib: pib_old = rtnl_dereference(phy->pib); ... rcu_assign_pointer(phy->pib, pib); kfree_rcu(pib_old, rcu); It assumes the RTNL is held, but ->set_channel is not always called under it: the mac802154 scan worker changes channels via drv_set_channel() without the RTNL. Such an update can race an RTNL-held one on the same phy; both read the same pib_old and both kfree_rcu() it, double-freeing the object. With SLUB percpu sheaves batching kfree_rcu(), this surfaces as a KASAN invalid-free in rcu_free_sheaf(). struct hwsim_phy has no lock for pib. Add one and make the swap atomic with rcu_replace_pointer() under it, dropping the misleading rtnl_dereference().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f25da51fdc381ca2863248c7060b3662632f0872 , < 9973b3a67a7592a780ea12b08334539a900deec1 (git)
Affected: f25da51fdc381ca2863248c7060b3662632f0872 , < d3b8f264ce09573aededd0a97dc41c8147797d8f (git)
Affected: f25da51fdc381ca2863248c7060b3662632f0872 , < db6442deecb1f13aeaf4f9d77746ea7555630fb3 (git)
Affected: f25da51fdc381ca2863248c7060b3662632f0872 , < 979d5b8de8ed4e1f997aef12da5694b99be7b871 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy-\u003epib:\n\n\tpib_old = rtnl_dereference(phy-\u003epib);\n\t...\n\trcu_assign_pointer(phy-\u003epib, pib);\n\tkfree_rcu(pib_old, rcu);\n\nIt assumes the RTNL is held, but -\u003eset_channel is not always called\nunder it: the mac802154 scan worker changes channels via\ndrv_set_channel() without the RTNL. Such an update can race an\nRTNL-held one on the same phy; both read the same pib_old and both\nkfree_rcu() it, double-freeing the object. With SLUB percpu sheaves\nbatching kfree_rcu(), this surfaces as a KASAN invalid-free in\nrcu_free_sheaf().\n\nstruct hwsim_phy has no lock for pib. Add one and make the swap atomic\nwith rcu_replace_pointer() under it, dropping the misleading\nrtnl_dereference()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:22:13.606Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-97599",
    "datePublished": "2026-09-25T10:22:13.606Z",
    "dateReserved": "2026-09-24T16:01:01.157Z",
    "dateUpdated": "2026-09-25T10:22:13.606Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-28",
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      "percentile": "0.08799"
    },
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      "initial_release_date": "2026-09-28T02:05:45.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
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      "title": "ieee802154: hwsim: serialize pib updates to fix double-free",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy-\u003epib:\n\n\tpib_old = rtnl_dereference(phy-\u003epib);\n\t...\n\trcu_assign_pointer(phy-\u003epib, pib);\n\tkfree_rcu(pib_old, rcu);\n\nIt assumes the RTNL is held, but -\u003eset_channel is not always called\nunder it: the mac802154 scan worker changes channels via\ndrv_set_channel() without the RTNL. Such an update can race an\nRTNL-held one on the same phy; both read the same pib_old and both\nkfree_rcu() it, double-freeing the object. With SLUB percpu sheaves\nbatching kfree_rcu(), this surfaces as a KASAN invalid-free in\nrcu_free_sheaf().\n\nstruct hwsim_phy has no lock for pib. Add one and make the swap atomic\nwith rcu_replace_pointer() under it, dropping the misleading\nrtnl_dereference()."
          }
        ],
        "id": "CVE-2026-97599",
        "lastModified": "2026-09-25T11:17:11.243",
        "metrics": {},
        "published": "2026-09-25T11:17:11.243",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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.

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  • 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.
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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.