CVE-2026-53234 (GCVE-0-2026-53234)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
net: ibm: emac: Fix use-after-free during device removal
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ibm: emac: Fix use-after-free during device removal The driver was using devm_register_netdev() which causes unregister_netdev() to be deferred until the devres cleanup phase, which runs after emac_remove() returns. This creates a use-after-free window where: 1. emac_remove() is called, which tears down hardware (cancels work, detaches modules, unregisters from MAL) 2. emac_remove() returns 3. devres cleanup runs and finally calls unregister_netdev() During step 3, the network stack might still process packets, triggering emac_irq(), emac_poll(), or other handlers that access now-freed hardware resources (dev->emacp, dev->mal, etc.). Fix this by replacing devm_register_netdev() with manual register_netdev() and calling unregister_netdev() at the beginning of emac_remove(), before any hardware teardown. This ensures the network device is fully stopped and unregistered before hardware resources are released. The change is safe because: - dev->ndev is assigned very early in probe (before any error paths that could bypass emac_remove) - platform_set_drvdata() is only called after successful registration, so emac_remove() only runs for fully registered devices - unregister_netdev() is idempotent and safe to call on any registered device
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a4dd8535a527061a01f2fd335596fa77ca240a96 , < cf8e14db93eaecc4c0c58299be3b3183b0e53ed5 (git)
Affected: a4dd8535a527061a01f2fd335596fa77ca240a96 , < c09c2e236eef6f59e105f38a30f5439e6ccbcad7 (git)
Affected: a4dd8535a527061a01f2fd335596fa77ca240a96 , < c12584cd6078085d707266be864e7e1cc91d74e3 (git)
Affected: a4dd8535a527061a01f2fd335596fa77ca240a96 , < a0130d682222ae21afc395aead7cd2d87e1a8358 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ibm/emac/core.c"
          ],
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          "vendor": "Linux",
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.1",
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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                  "versionEndExcluding": "6.18.36",
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                },
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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\nnet: ibm: emac: Fix use-after-free during device removal\n\nThe driver was using devm_register_netdev() which causes unregister_netdev()\nto be deferred until the devres cleanup phase, which runs after emac_remove()\nreturns. This creates a use-after-free window where:\n\n1. emac_remove() is called, which tears down hardware (cancels work, detaches\n   modules, unregisters from MAL)\n2. emac_remove() returns\n3. devres cleanup runs and finally calls unregister_netdev()\n\nDuring step 3, the network stack might still process packets, triggering\nemac_irq(), emac_poll(), or other handlers that access now-freed hardware\nresources (dev-\u003eemacp, dev-\u003emal, etc.).\n\nFix this by replacing devm_register_netdev() with manual register_netdev()\nand calling unregister_netdev() at the beginning of emac_remove(), before\nany hardware teardown. This ensures the network device is fully stopped and\nunregistered before hardware resources are released.\n\nThe change is safe because:\n- dev-\u003endev is assigned very early in probe (before any error paths that\n  could bypass emac_remove)\n- platform_set_drvdata() is only called after successful registration, so\n  emac_remove() only runs for fully registered devices\n- unregister_netdev() is idempotent and safe to call on any registered device"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:31.852Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cf8e14db93eaecc4c0c58299be3b3183b0e53ed5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c09c2e236eef6f59e105f38a30f5439e6ccbcad7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c12584cd6078085d707266be864e7e1cc91d74e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0130d682222ae21afc395aead7cd2d87e1a8358"
        }
      ],
      "title": "net: ibm: emac: Fix use-after-free during device removal",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53234",
    "datePublished": "2026-06-25T08:39:31.852Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
    "dateUpdated": "2026-06-25T08:39:31.852Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53234",
      "date": "2026-07-02",
      "epss": "0.00176",
      "percentile": "0.07335"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53234\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:41.293\",\"lastModified\":\"2026-06-30T14:44:27.313\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ibm: emac: Fix use-after-free during device removal\\n\\nThe driver was using devm_register_netdev() which causes unregister_netdev()\\nto be deferred until the devres cleanup phase, which runs after emac_remove()\\nreturns. This creates a use-after-free window where:\\n\\n1. emac_remove() is called, which tears down hardware (cancels work, detaches\\n   modules, unregisters from MAL)\\n2. emac_remove() returns\\n3. devres cleanup runs and finally calls unregister_netdev()\\n\\nDuring step 3, the network stack might still process packets, triggering\\nemac_irq(), emac_poll(), or other handlers that access now-freed hardware\\nresources (dev-\u003eemacp, dev-\u003emal, etc.).\\n\\nFix this by replacing devm_register_netdev() with manual register_netdev()\\nand calling unregister_netdev() at the beginning of emac_remove(), before\\nany hardware teardown. This ensures the network device is fully stopped and\\nunregistered before hardware resources are released.\\n\\nThe change is safe because:\\n- dev-\u003endev is assigned very early in probe (before any error paths that\\n  could bypass emac_remove)\\n- platform_set_drvdata() is only called after successful registration, so\\n  emac_remove() only runs for fully registered devices\\n- unregister_netdev() is idempotent and safe to call on any registered device\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/ibm/emac/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a4dd8535a527061a01f2fd335596fa77ca240a96\",\"lessThan\":\"cf8e14db93eaecc4c0c58299be3b3183b0e53ed5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4dd8535a527061a01f2fd335596fa77ca240a96\",\"lessThan\":\"c09c2e236eef6f59e105f38a30f5439e6ccbcad7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4dd8535a527061a01f2fd335596fa77ca240a96\",\"lessThan\":\"c12584cd6078085d707266be864e7e1cc91d74e3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4dd8535a527061a01f2fd335596fa77ca240a96\",\"lessThan\":\"a0130d682222ae21afc395aead7cd2d87e1a8358\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/ibm/emac/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/a0130d682222ae21afc395aead7cd2d87e1a8358\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c09c2e236eef6f59e105f38a30f5439e6ccbcad7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c12584cd6078085d707266be864e7e1cc91d74e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf8e14db93eaecc4c0c58299be3b3183b0e53ed5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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.
  • 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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