CVE-2023-54225 (GCVE-0-2023-54225)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-05-11 19:57
VLAI
Title
net: ipa: only reset hashed tables when supported
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipa: only reset hashed tables when supported Last year, the code that manages GSI channel transactions switched from using spinlock-protected linked lists to using indexes into the ring buffer used for a channel. Recently, Google reported seeing transaction reference count underflows occasionally during shutdown. Doug Anderson found a way to reproduce the issue reliably, and bisected the issue to the commit that eliminated the linked lists and the lock. The root cause was ultimately determined to be related to unused transactions being committed as part of the modem shutdown cleanup activity. Unused transactions are not normally expected (except in error cases). The modem uses some ranges of IPA-resident memory, and whenever it shuts down we zero those ranges. In ipa_filter_reset_table() a transaction is allocated to zero modem filter table entries. If hashing is not supported, hashed table memory should not be zeroed. But currently nothing prevents that, and the result is an unused transaction. Something similar occurs when we zero routing table entries for the modem. By preventing any attempt to clear hashed tables when hashing is not supported, the reference count underflow is avoided in this case. Note that there likely remains an issue with properly freeing unused transactions (if they occur due to errors). This patch addresses only the underflows that Google originally reported.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6971 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d338ae28d8a866c57fcac38f3d77bcc1d1702d19 , < 50c24f0c940728792c8bdf65c1eaf6b91b3b0dcd (git)
Affected: d338ae28d8a866c57fcac38f3d77bcc1d1702d19 , < c00af3a818cc573e10100cc6770f0e47befa1fa4 (git)
Affected: d338ae28d8a866c57fcac38f3d77bcc1d1702d19 , < e11ec2b868af2b351c6c1e2e50eb711cc5423a10 (git)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.45 , ≤ 6.1.* (semver)
Unaffected: 6.4.8 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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          "programFiles": [
            "drivers/net/ipa/ipa_table.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipa: only reset hashed tables when supported\n\nLast year, the code that manages GSI channel transactions switched\nfrom using spinlock-protected linked lists to using indexes into the\nring buffer used for a channel.  Recently, Google reported seeing\ntransaction reference count underflows occasionally during shutdown.\n\nDoug Anderson found a way to reproduce the issue reliably, and\nbisected the issue to the commit that eliminated the linked lists\nand the lock.  The root cause was ultimately determined to be\nrelated to unused transactions being committed as part of the modem\nshutdown cleanup activity.  Unused transactions are not normally\nexpected (except in error cases).\n\nThe modem uses some ranges of IPA-resident memory, and whenever it\nshuts down we zero those ranges.  In ipa_filter_reset_table() a\ntransaction is allocated to zero modem filter table entries.  If\nhashing is not supported, hashed table memory should not be zeroed.\nBut currently nothing prevents that, and the result is an unused\ntransaction.  Something similar occurs when we zero routing table\nentries for the modem.\n\nBy preventing any attempt to clear hashed tables when hashing is not\nsupported, the reference count underflow is avoided in this case.\n\nNote that there likely remains an issue with properly freeing unused\ntransactions (if they occur due to errors).  This patch addresses\nonly the underflows that Google originally reported."
        }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/e11ec2b868af2b351c6c1e2e50eb711cc5423a10"
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      "title": "net: ipa: only reset hashed tables when supported",
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    "cveId": "CVE-2023-54225",
    "datePublished": "2025-12-30T12:11:18.839Z",
    "dateReserved": "2025-12-30T12:06:44.501Z",
    "dateUpdated": "2026-05-11T19:57:52.130Z",
    "state": "PUBLISHED"
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        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipa: only reset hashed tables when supported\n\nLast year, the code that manages GSI channel transactions switched\nfrom using spinlock-protected linked lists to using indexes into the\nring buffer used for a channel.  Recently, Google reported seeing\ntransaction reference count underflows occasionally during shutdown.\n\nDoug Anderson found a way to reproduce the issue reliably, and\nbisected the issue to the commit that eliminated the linked lists\nand the lock.  The root cause was ultimately determined to be\nrelated to unused transactions being committed as part of the modem\nshutdown cleanup activity.  Unused transactions are not normally\nexpected (except in error cases).\n\nThe modem uses some ranges of IPA-resident memory, and whenever it\nshuts down we zero those ranges.  In ipa_filter_reset_table() a\ntransaction is allocated to zero modem filter table entries.  If\nhashing is not supported, hashed table memory should not be zeroed.\nBut currently nothing prevents that, and the result is an unused\ntransaction.  Something similar occurs when we zero routing table\nentries for the modem.\n\nBy preventing any attempt to clear hashed tables when hashing is not\nsupported, the reference count underflow is avoided in this case.\n\nNote that there likely remains an issue with properly freeing unused\ntransactions (if they occur due to errors).  This patch addresses\nonly the underflows that Google originally reported."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: ipa: solo restablecer tablas hash cuando sea compatible\n\nEl a\u00f1o pasado, el c\u00f3digo que gestiona las transacciones del canal GSI cambi\u00f3 de usar listas enlazadas protegidas por spinlock a usar \u00edndices en el b\u00fafer circular utilizado para un canal. Recientemente, Google inform\u00f3 haber visto desbordamientos negativos del contador de referencias de transacciones ocasionalmente durante el apagado.\n\nDoug Anderson encontr\u00f3 una manera de reproducir el problema de forma fiable, y realiz\u00f3 una b\u00fasqueda binaria del problema hasta el commit que elimin\u00f3 las listas enlazadas y el bloqueo. La causa ra\u00edz finalmente se determin\u00f3 que estaba relacionada con transacciones no utilizadas que se estaban confirmando como parte de la actividad de limpieza del apagado del m\u00f3dem. Las transacciones no utilizadas no se esperan normalmente (excepto en casos de error).\n\nEl m\u00f3dem utiliza algunos rangos de memoria residente en IPA, y cada vez que se apaga ponemos a cero esos rangos. En ipa_filter_reset_table() se asigna una transacci\u00f3n para poner a cero las entradas de la tabla de filtros del m\u00f3dem. Si el hashing no es compatible, la memoria de la tabla hash no deber\u00eda ponerse a cero. Pero actualmente nada lo impide, y el resultado es una transacci\u00f3n no utilizada. Algo similar ocurre cuando ponemos a cero las entradas de la tabla de enrutamiento para el m\u00f3dem.\n\nAl evitar cualquier intento de borrar tablas hash cuando el hashing no es compatible, se evita el desbordamiento negativo del contador de referencias en este caso.\n\nTenga en cuenta que probablemente a\u00fan queda un problema con la liberaci\u00f3n adecuada de transacciones no utilizadas (si ocurren debido a errores). Este parche aborda solo los desbordamientos negativos que Google inform\u00f3 originalmente."
          }
        ],
        "id": "CVE-2023-54225",
        "lastModified": "2026-10-28T19:10:00.193",
        "metrics": {},
        "published": "2025-12-30T13:16:10.877",
        "references": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T22:44:20+00:00",
      "cve": "CVE-2023-54225",
      "id": "CVE-2023-54225",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ipa: only reset hashed tables when supported",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54225.json",
      "version": "3"
    }
  }
}



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