{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74736",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74736"
  ],
  "published": "2026-08-26T14:37:59Z",
  "summary": "net/sched: cls_bpf: reject dev-bound programs bound to a different device",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_bpf: reject dev-bound programs bound to a different device\n\ncls_bpf_prog_from_efd() obtained a SCHED_CLS program via\nbpf_prog_get_type_dev() but never verified that a device-bound (offloaded)\nprogram's bound netdev matches the TC netdev the classifier is being\nattached to. This let a program loaded with prog_ifindex for device A be\nattached via cls_bpf + skip_sw to device B; deleting device A then\ndestroyed the program's offload state while it was still attached to\ndevice B, triggering a netdevsim WARN (panic with panic_on_warn=1).\n\nMirror the XDP attach path (net/core/dev.c) and reject the attach with\n-EINVAL when a dev-bound program's bound device does not match the\ntarget device.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74736"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec5a552f4b2d841c6c021752450716e1a9676661"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/daf546ab5763ce6a18280cb4db060e836c515301"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/adb3e7c26a51a10d94a241c6de7a81a2863dcacf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/120977e2c096deea4e866e4273be9220b957c29e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T05:18:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local RTM_NEWTFILTER and bpf(2) syscalls to misattach a dev-bound cls_bpf program and delete the bound netdev; received network packets are not the trigger and no remote pre-auth path reaches this code.\nAC:L - The attacker fully controls bpf load on device A, cls_bpf attach with SKIP_SW to device B, and deletion of device A, deterministically reproducing the offload teardown while the program remains referenced on device B.\nPR:L - RTNL TC filter operations require CAP_NET_ADMIN and BPF_PROG_TYPE_SCHED_CLS loading requires CAP_NET_ADMIN (and often CAP_BPF), all grantable to the namespace root created by an unprivileged user via unshare -Urn per kernel CNA guidance.\nUI:N - No victim interaction is required; the attacker performs bpf program load, cls_bpf attach, and netdev deletion through their own namespace-local administrative operations.\nS:U - Impact is kernel memory corruption, panic, or privilege escalation within the same host kernel and does not cross VM, container, or IOMMU boundaries into a separate security authority.\nC:H - Deleting the bound netdev destroys bpf offload private state while cls_bpf on another device still holds the program reference, freeing dev_private metadata and creating a use-after-free that can leak kernel heap contents on subsequent TC/BPF operations.\nI:H - The lifetime mismatch frees attacker-influenceable offload objects while references remain, enabling heap grooming and memory corruption that can be leveraged into arbitrary kernel writes or code execution.\nA:H - netdevsim WARNs when offload state is destroyed while the program remains loaded on another port, causing kernel panic on systems with panic_on_warn enabled, and dereferencing freed offload state can also trigger kernel oops or hang."
    }
  }
}