Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: lan743x: fix RX checksum use-after-free lan743x_rx_process_buffer() adds each non-first receive buffer to the head skb's frag_list. On the last descriptor, lan743x_rx_trim_skb() linearizes the head and frees the fragment skb metadata. The checksum-success path then writes ip_summed through the local skb pointer, which still points to the final fragment. This causes a use-after-free write when a packet spans more than one receive buffer. Set ip_summed on the surviving head skb instead. Multi-buffer receive can occur after a live MTU increase because existing ring entries keep their old buffer size until they are replenished. A KUnit test invoking lan743x_rx_process_buffer() with a two-buffer packet produced a one-byte KASAN use-after-free write before this change. The same test passed after the change. The driver object also builds with W=1. This was not tested on physical LAN743x hardware.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a before 0e52886c4324c9897c2c62f92be3dc8316cee67e; affected cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a before a58024835c704419bb46d2a34e5223f65605f958; affected cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a before 6fe5c3a2503983abb431d93faeadfc7f5e6a7e33; affected cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a before 5c216bfa9fb7b36804485e67975e9c98055b31ef; affected cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a before 161a403c8625e152de03d1da22bbf9cda6dc9f9f; affected cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a before a9ce4053dc945c5372dedba5017ee675b30dc0c5 |
| Linux / Linux | affected 6.1; unaffected 0 before 6.1; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.54 through 6.18.*; unaffected 7.2.8 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0e52886c4324c9897c2c62f92be3dc8316cee67e
- https://git.kernel.org/stable/c/a58024835c704419bb46d2a34e5223f65605f958
- https://git.kernel.org/stable/c/6fe5c3a2503983abb431d93faeadfc7f5e6a7e33
- https://git.kernel.org/stable/c/5c216bfa9fb7b36804485e67975e9c98055b31ef
- https://git.kernel.org/stable/c/161a403c8625e152de03d1da22bbf9cda6dc9f9f
- https://git.kernel.org/stable/c/a9ce4053dc945c5372dedba5017ee675b30dc0c5