net/packet: clear RX owner on VNET header error

Summary

In the Linux kernel, the following vulnerability has been resolved: net/packet: clear RX owner on VNET header error Commit 61fad6816fc1 ("net/packet: tpacket_rcv: avoid a producer race condition") added rx_owner_map and made tpacket_rcv() claim a V1 or V2 ring slot before converting the virtio-net header. If the conversion fails, the drop path leaves the slot claimed. With a one-frame TPACKET_V2 ring, an unsupported UDP GSO packet leaves the only slot unavailable, so the ring also drops the next valid packet. Clear the ownership bit on this error path. TPACKET_V3 already clears its block state here.

Timeline

1. Oct 6, 2026, 8:45 AM UTCCVE published
2. Oct 19, 2026, 9:16 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in bb10a0084c03a94364aeec542beddc5d49b59f59; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in b8c0cb3069058c2d67b5c7c833b2833381ecffdc; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in 2daa618e7ff19eefcbda281bc4c5998c4140f9cf; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in 23cd30498891d29a69ec9b75bd92f8a0f21f1342; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in 49a48a5aaf85fe69d2dc3fb334b4854fadf44e39; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in 805edbdcb8681da5f7ee43b3c3c809f7a8c31208; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in 693209a237fc548791cf402441db8b68d1da7d38; From 61fad6816fc10fb8793a925d5c1256d1c3db0cd2 · fixed in 33ff111d7ba3beb86e28938d6382bb5beabd865a; From 4.14.175 · fixed in 4.15; From 4.19.114 · fixed in 4.20; From 5.4.29 · fixed in 5.5; From 5.5.14 · fixed in 5.6

• Linux Linux

  5.6

• KernelLinux

  From 5.6.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8