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

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2025-12-30 12:11
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
References
Impacted products
Vendor Product Version
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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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ipa/ipa_table.c"
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      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-30T12:11:18.839Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/50c24f0c940728792c8bdf65c1eaf6b91b3b0dcd"
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          "url": "https://git.kernel.org/stable/c/c00af3a818cc573e10100cc6770f0e47befa1fa4"
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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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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54225",
    "datePublished": "2025-12-30T12:11:18.839Z",
    "dateReserved": "2025-12-30T12:06:44.501Z",
    "dateUpdated": "2025-12-30T12:11:18.839Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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