{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80739",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80739"
  ],
  "published": "2026-09-03T08:22:05Z",
  "summary": "net/mlx5e: TC, Check if flow is PEER before acquiring devcom lock",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: TC, Check if flow is PEER before acquiring devcom lock\n\nIn case __mlx5e_add_fdb_flow() fails in lower levels, the flow is\ndeleted via mlx5e_tc_del_flow(), and mlx5e_tc_del_flow() is acquiring\nESW devcom lock without condition. In addition, in case of peer_flow,\n__mlx5e_add_fdb_flow() is called while holding ESW devcom comp lock.\nThis results in an AA deadlock.\n\nTo fix this, introduce a new PEER flag that is set on flows created as\npeer flows (the duplicate flows on peer devices), and check it in\nmlx5e_tc_del_flow() before acquiring ESW devcom lock.\n\nLockdep splat:\n============================================\nWARNING: possible recursive locking detected\n============================================\n Possible unsafe locking scenario:\n       CPU0\n       ----\n  lock(&comp->lock_key#2);\n  lock(&comp->lock_key#2);\n *** DEADLOCK ***\nCall Trace:\n <TASK>\n dump_stack_lvl+0x69/0xa0\n print_deadlock_bug.cold+0xbd/0xca\n __lock_acquire+0x1671/0x2ec0\n lock_acquire+0x10e/0x2e0\n down_read+0x95/0x430\n mlx5_devcom_for_each_peer_begin+0x4e/0xe0 [mlx5_core]\n mlx5e_tc_del_flow+0x11d/0xa70 [mlx5_core]\n mlx5e_flow_put+0x99/0x100 [mlx5_core]\n __mlx5e_add_fdb_flow+0x409/0xf00 [mlx5_core]\n mlx5e_configure_flower+0x2a86/0x4100 [mlx5_core]\n mlx5e_rep_setup_tc_cls_flower+0x12f/0x1b0 [mlx5_core]\n mlx5e_rep_setup_tc_cb+0x153/0x750 [mlx5_core]\n tc_setup_cb_add+0x1dc/0x470\n fl_change+0x2f4d/0x626d [cls_flower]\n tc_new_tfilter+0x79b/0x2310\n rtnetlink_rcv_msg+0x778/0xad0\n do_syscall_64+0x70/0x960\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n </TASK>",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80739"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-03T08:22:05Z"
  }
}