CVE-2026-72047 (GCVE-0-2026-72047)
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 pointer truncation in kfifo on 64-bit ca8210_test_int_driver_write() and ca8210_test_int_user_read() exchange a kmalloc'd buffer pointer through a struct kfifo, but pass a literal '4' as the byte count to kfifo_in()/kfifo_out(). This is correct on 32-bit (pointer = 4 bytes), but on 64-bit only the low 4 bytes of the 8-byte pointer are written into the FIFO. The reader then reads back 4 bytes into an 8-byte local pointer variable, leaving the upper 4 bytes uninitialized stack data. The first dereference of the reconstructed pointer (fifo_buffer[1]) accesses an arbitrary kernel address and generally results in an oops. Use sizeof(fifo_buffer) so the byte count matches pointer width on every architecture. The driver has no architecture restriction in Kconfig, so any 64-bit build with CONFIG_IEEE802154_CA8210_DEBUGFS=y is exposed. Issue has been latent since the driver was added in 2017 because it is most commonly deployed on 32-bit MCUs. Found via a custom Coccinelle semantic patch hunting for short-byte kfifo I/O on byte-mode kfifos used to shuttle pointers.
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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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ieee802154/ca8210.c"
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          "vendor": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "version": "7.1.5",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: ca8210: fix pointer truncation in kfifo on 64-bit\n\nca8210_test_int_driver_write() and ca8210_test_int_user_read() exchange\na kmalloc\u0027d buffer pointer through a struct kfifo, but pass a literal\n\u00274\u0027 as the byte count to kfifo_in()/kfifo_out().\n\nThis is correct on 32-bit (pointer = 4 bytes), but on 64-bit only the\nlow 4 bytes of the 8-byte pointer are written into the FIFO. The reader\nthen reads back 4 bytes into an 8-byte local pointer variable, leaving\nthe upper 4 bytes uninitialized stack data. The first dereference of\nthe reconstructed pointer (fifo_buffer[1]) accesses an arbitrary kernel\naddress and generally results in an oops.\n\nUse sizeof(fifo_buffer) so the byte count matches pointer width on every\narchitecture.\n\nThe driver has no architecture restriction in Kconfig, so any 64-bit\nbuild with CONFIG_IEEE802154_CA8210_DEBUGFS=y is exposed. Issue has\nbeen latent since the driver was added in 2017 because it is most\ncommonly deployed on 32-bit MCUs.\n\nFound via a custom Coccinelle semantic patch hunting for short-byte\nkfifo I/O on byte-mode kfifos used to shuttle pointers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:07:12.985Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2c1664ccfae653979b38788211240b5a1ee317ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/093aacb0c56d5c693e3169a0224062e77c3fd0c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/87dab14a4f68895d6f4d798e6ee3556cd64e8c72"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fe2643d0b24ca3cdd61a31a45c2d3233dc6cbfe"
        },
        {
          "url": "https://git.kernel.org/stable/c/65dc342274a01616f5c17105f7360a3b4bfd7a3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2059c28bd725beded01277cdf1f67be33e714323"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8ce67fa6a5e6929f5414e933ff9665176c2bce6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d7f7bcf225b2d566176bf6229dbd1252940cb3c"
        }
      ],
      "title": "ieee802154: ca8210: fix pointer truncation in kfifo on 64-bit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72047",
    "datePublished": "2026-08-15T05:52:05.510Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-17T05:07:12.985Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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