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CVE-2026-72047 (GCVE-0-2026-72047)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:07
VLAI
Title
ieee802154: ca8210: fix pointer truncation in kfifo on 64-bit
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 2c1664ccfae653979b38788211240b5a1ee317ed (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 093aacb0c56d5c693e3169a0224062e77c3fd0c0 (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 87dab14a4f68895d6f4d798e6ee3556cd64e8c72 (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 1fe2643d0b24ca3cdd61a31a45c2d3233dc6cbfe (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 65dc342274a01616f5c17105f7360a3b4bfd7a3d (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 2059c28bd725beded01277cdf1f67be33e714323 (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < d8ce67fa6a5e6929f5414e933ff9665176c2bce6 (git)
Affected: ded845a781a578dfb0b5b2c138e5a067aa3b1242 , < 6d7f7bcf225b2d566176bf6229dbd1252940cb3c (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T18:17:06+00:00",
      "cve": "CVE-2026-72047",
      "id": "CVE-2026-72047",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ieee802154: ca8210: fix pointer truncation in kfifo on 64-bit",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72047.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.