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.

https://git.kernel.org/stable/c/093aacb0c56d5c693e3169a0224062e77c3fd0c0

https://git.kernel.org/stable/c/1fe2643d0b24ca3cdd61a31a45c2d3233dc6cbfe

https://git.kernel.org/stable/c/2059c28bd725beded01277cdf1f67be33e714323

https://git.kernel.org/stable/c/2c1664ccfae653979b38788211240b5a1ee317ed

https://git.kernel.org/stable/c/65dc342274a01616f5c17105f7360a3b4bfd7a3d

https://git.kernel.org/stable/c/6d7f7bcf225b2d566176bf6229dbd1252940cb3c

https://git.kernel.org/stable/c/87dab14a4f68895d6f4d798e6ee3556cd64e8c72

https://git.kernel.org/stable/c/d8ce67fa6a5e6929f5414e933ff9665176c2bce6

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