{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68296",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68296"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "net: gre: fix lltx regression for GRE tunnels with SEQ/CSUM",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gre: fix lltx regression for GRE tunnels with SEQ/CSUM\n\nBefore commit 00d066a4d4ed (\"netdev_features: convert NETIF_F_LLTX to\ndev->lltx\"), NETIF_F_LLTX was set unconditionally in both\n__gre_tunnel_init() and ip6gre_tnl_init_features() alongside\nGRE_FEATURES:\n\n    dev->features |= GRE_FEATURES | NETIF_F_LLTX;\n\nWhen that commit converted NETIF_F_LLTX to the dev->lltx flag, it\nplaced 'dev->lltx = true' after the SEQ/CSUM early returns instead\nof before them. This causes GRE/GRETAP/ip6gre tunnels with SEQ or\nCSUM+encap to lose lockless TX, reintroducing _xmit_lock acquisition\naround their ndo_start_xmit. Since GRE xmit re-enters the stack via\nip_tunnel_xmit(), holding _xmit_lock risks ABBA deadlock with the\nunderlay device.\n\n  CPU0                        CPU1\n  ----                        ----\n  lock(&qdisc_xmit_lock_key#6);\n                              lock(&qdisc_xmit_lock_key#3);\n                              lock(&qdisc_xmit_lock_key#6);\n  lock(&qdisc_xmit_lock_key#3);\n\nFix by moving dev->lltx = true before the early returns in both\nfunctions, restoring the original unconditional behavior.",
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