vulnerabilitymediumCVE-2026-23254

CVE-2026-23254: In the Linux kernel, the following vulnerability has been resolved: net: gro: fix outer network offset The udp GRO

zeroday.news·112d ago

CVE-2026-23254vulnerability

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In the Linux kernel, the following vulnerability has been resolved: net: gro: fix outer network offset The udp GRO complete stage assumes that all the packets inserted the RX have the `encapsulation` flag zeroed. Such assumption is not true, as a few H/W NICs can set such flag when H/W offloading the checksum for an UDP encapsulated traffic, the tun driver can inject GSO packets with UDP encapsulation and the problematic layout can also be created via a veth based setup. Due to the above, in the problematic scenarios, udp4_gro_complete() uses the wrong network offset (inner instead of outer) to compute the outer UDP header pseudo checksum, leading to csum validation errors later on in pac

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