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

net: garp: fix unsigned integer underflow in garp_pdu_parse_attr

The receive-side GARP attribute parser computes dlen with reversed
operands:

        dlen = sizeof(*ga) - ga->len;

ga->len is the on-wire attribute length and includes the GARP attribute
header. For normal attributes with data, ga->len is larger than
sizeof(*ga), so the subtraction underflows in unsigned arithmetic.

The resulting value is later passed to garp_attr_lookup(), whose length
argument is u8. After truncation, the parsed data length usually no
longer matches the length stored for locally registered attributes, so
received Join/Leave events are ignored. This breaks the GARP receive path
for common attributes, such as GVRP VLAN registration attributes.

Compute the data length as the attribute length minus the header length.

https://git.kernel.org/stable/c/04e22fefac1af3e32f245e9045382348773b5d59

https://git.kernel.org/stable/c/16e408e607a94b646fb14a2a98422c6877ae4b3c

https://git.kernel.org/stable/c/29f28172afb2ae7b31e9bf3e978396f20b381688

https://git.kernel.org/stable/c/74e02121be1dcc0efcd56ebdf0171d6129105659

https://git.kernel.org/stable/c/973cf7c433d27f4d9556d0b7c332543be7ed7a6e

https://git.kernel.org/stable/c/a11f1a671b1361f0f1278dc0041374f2730df73f

https://git.kernel.org/stable/c/d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a

https://git.kernel.org/stable/c/d8dcd14aa886b8effd83022c550669f4f262854b

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