Vulnerability CVE-2024-38586
Published: 2024-06-19

Description:
In the Linux kernel, the following vulnerability has been resolved:

r8169: Fix possible ring buffer corruption on fragmented Tx packets.

An issue was found on the RTL8125b when transmitting small fragmented
packets, whereby invalid entries were inserted into the transmit ring
buffer, subsequently leading to calls to dma_unmap_single() with a null
address.

This was caused by rtl8169_start_xmit() not noticing changes to nr_frags
which may occur when small packets are padded (to work around hardware
quirks) in rtl8169_tso_csum_v2().

To fix this, postpone inspecting nr_frags until after any padding has been
applied.

 References:
https://git.kernel.org/stable/c/b6d21cf40de103d63ae78551098a7c06af8c98dd
https://git.kernel.org/stable/c/0c48185a95309556725f818b82120bb74e9c627d
https://git.kernel.org/stable/c/68222d7b4b72aa321135cd453dac37f00ec41fd1
https://git.kernel.org/stable/c/078d5b7500d70af2de6b38e226b03f0b932026a6
https://git.kernel.org/stable/c/54e7a0d111240c92c0f02ceba6eb8f26bf6d6479
https://git.kernel.org/stable/c/c71e3a5cffd5309d7f84444df03d5b72600cc417
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