Description · from the CVE record
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: fix GSO userspace truncation underflow
OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb
length in OVS_CB(skb)->cutlen. When a later userspace action segments a
GSO skb, queue_gso_packets() reuses that delta for each smaller segment.
A segment can then reach queue_userspace_packet() with cutlen greater
than skb->len, underflowing the length passed to skb_zerocopy().
Store the maximum preserved length instead and bound each consumer
against the current skb length. Use U32_MAX as the no-truncation
sentinel so the value remains valid if skb geometry changes before a
consumer handles it.
Affected
ProductAffectedFixed inSource
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < 50a6a85f3d6b1d22d8436848606cdef5d2c490b450a6a85f3d6b1d22d8436848606cdef5d2c490b4CNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < 2623c48cc3a8da9a1886fd8f65c0e348f4406fd62623c48cc3a8da9a1886fd8f65c0e348f4406fd6CNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < e211b081901ffca76674082c73eeaed53524c369e211b081901ffca76674082c73eeaed53524c369CNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855CNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dcfbfa3ad2ad6f3a5624aba5211c46290fb98cc9dcCNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < 100a23b1613e9218e0af654ef102352c713f0263100a23b1613e9218e0af654ef102352c713f0263CNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < ea85dbcbe8d4056ecb54352f97743d138ea4c407ea85dbcbe8d4056ecb54352f97743d138ea4c407CNA
Linuxf2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 – < 4032f8ed10fcb84d41c508dfb04be96589f78dfe4032f8ed10fcb84d41c508dfb04be96589f78dfeCNA
Linux4.8–CNA
by Kastro