CVE-2026-72048 (GCVE-0-2026-72048)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-17 05:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ieee802154: ca8210: fix cas_ctl leak on spi_async failure ca8210_spi_transfer() allocates cas_ctl with kzalloc_obj(GFP_ATOMIC) and relies entirely on the SPI completion callback ca8210_spi_transfer_complete() to free it. The spi_async() API only invokes the completion callback on successful submission. On failure it returns a negative error code without ever queuing the callback, which leaves cas_ctl and its embedded spi_message and spi_transfer orphaned. Every kfree(cas_ctl) in the driver is inside the completion callback, so there is no other reclamation path. ca8210_spi_transfer() is called from ca8210_spi_exchange(), the interrupt handler ca8210_interrupt_handler(), and from the retry path inside the completion callback itself. The exchange and interrupt handler paths loop on -EBUSY, so under sustained SPI bus contention every retry iteration leaks a fresh cas_ctl (~600 bytes per occurrence). Fix it by freeing cas_ctl on the spi_async() error path. While here, correct the misleading error string: the function calls spi_async(), not spi_sync().
References
Impacted products
Vendor Product Version
Linux Linux Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
Version: ded845a781a578dfb0b5b2c138e5a067aa3b1242
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: ca8210: fix cas_ctl leak on spi_async failure\n\nca8210_spi_transfer() allocates cas_ctl with kzalloc_obj(GFP_ATOMIC)\nand relies entirely on the SPI completion callback\nca8210_spi_transfer_complete() to free it.\n\nThe spi_async() API only invokes the completion callback on successful\nsubmission.  On failure it returns a negative error code without ever\nqueuing the callback, which leaves cas_ctl and its embedded spi_message\nand spi_transfer orphaned.  Every kfree(cas_ctl) in the driver is\ninside the completion callback, so there is no other reclamation path.\n\nca8210_spi_transfer() is called from ca8210_spi_exchange(), the\ninterrupt handler ca8210_interrupt_handler(), and from the retry path\ninside the completion callback itself.  The exchange and interrupt\nhandler paths loop on -EBUSY, so under sustained SPI bus contention\nevery retry iteration leaks a fresh cas_ctl (~600 bytes per\noccurrence).\n\nFix it by freeing cas_ctl on the spi_async() error path.  While here,\ncorrect the misleading error string: the function calls spi_async(),\nnot spi_sync()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:07:14.096Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/460c5cd51e4d7d15b317f178f42cfcb666c0fe91"
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        {
          "url": "https://git.kernel.org/stable/c/b07aea90dbc6e188c74c100af64b77b9482ffc65"
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          "url": "https://git.kernel.org/stable/c/b9071dc7889bef42590e04fbf3e56cc65e1e5e6e"
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          "url": "https://git.kernel.org/stable/c/d4a397fe803c2d157f6ebb068b802ef75fbf109e"
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          "url": "https://git.kernel.org/stable/c/cb5cca1d2a908ddd5e357971de0f2009617b8d6a"
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        {
          "url": "https://git.kernel.org/stable/c/7e3630fbb6aabb844bbf35746dee0bf3894100c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/e09390e439bd7cca30dd10893b1f64802961667a"
        }
      ],
      "title": "ieee802154: ca8210: fix cas_ctl leak on spi_async failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72048",
    "datePublished": "2026-08-15T05:52:06.253Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-17T05:07:14.096Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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