CVE-2022-48815 (GCVE-0-2022-48815)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:44 – Updated: 2026-05-11 18:47
VLAI
Title
net: dsa: bcm_sf2: don't use devres for mdiobus
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dsa: bcm_sf2: don't use devres for mdiobus As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The Starfighter 2 is a platform device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the bcm_sf2 switch driver on shutdown. So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The bcm_sf2 driver has the code structure in place for orderly mdiobus removal, so just replace devm_mdiobus_alloc() with the non-devres variant, and add manual free where necessary, to ensure that we don't let devres free a still-registered bus.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:58 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < 2770b795294ed312375c11ef1d0b810499c66b83 (git)
Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < caabb5f64f5c32fceed93356bb688ef1ec6c5783 (git)
Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < 08e1a3554e99a1a5bd2835907381e2383ee85cae (git)
Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < 08f1a20822349004bb9cc1b153ecb516e9f2889d (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.101 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
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          {
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              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T10:44:39+00:00",
      "cve": "CVE-2022-48815",
      "id": "CVE-2022-48815",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "150",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: dsa: bcm_sf2: don\u0026#39;t use devres for mdiobus",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48815.json",
      "version": "3"
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        "dateReserved": "2024-07-16T11:38:08.900Z",
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}



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