Vulnerability in Linux

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund5 Oct 2026WID-SEC-2026-3743

  Linux Kernel: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-98221CVE-2026-98181CVE-2026-98248+204 more CVEs

[ References ]References

• git.kernel.org/stable/c/23cd30498891d29a69ec9b75bd92f8a0f21f1342
• git.kernel.org/stable/c/2daa618e7ff19eefcbda281bc4c5998c4140f9cf
• git.kernel.org/stable/c/33ff111d7ba3beb86e28938d6382bb5beabd865a
• git.kernel.org/stable/c/49a48a5aaf85fe69d2dc3fb334b4854fadf44e39
• git.kernel.org/stable/c/693209a237fc548791cf402441db8b68d1da7d38
• git.kernel.org/stable/c/805edbdcb8681da5f7ee43b3c3c809f7a8c31208
• git.kernel.org/stable/c/b8c0cb3069058c2d67b5c7c833b2833381ecffdc
• git.kernel.org/stable/c/bb10a0084c03a94364aeec542beddc5d49b59f59