CVE-2026-72047 ieee802154: ca8210: fix pointer truncation in kfifo on 64-bit
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-72047?
CVE-2026-72047 is a vulnerability in Linux, published on 15 Aug 2026.
Official description
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.
Which versions are affected by CVE-2026-72047?
How do I fix CVE-2026-72047?
Upgrade to a fixed version.
Is CVE-2026-72047 being exploited?
There is no known exploitation of CVE-2026-72047 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72047, DEBIAN-CVE-2026-72047, GHSA-r4v9-gf4r-42ww, UBUNTU-CVE-2026-72047.