{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-58237",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-58237"
  ],
  "published": "2025-05-05T14:53:47Z",
  "summary": "bpf: consider that tail calls invalidate packet pointers",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: consider that tail calls invalidate packet pointers\n\nTail-called programs could execute any of the helpers that invalidate\npacket pointers. Hence, conservatively assume that each tail call\ninvalidates packet pointers.\n\nMaking the change in bpf_helper_changes_pkt_data() automatically makes\nuse of check_cfg() logic that computes 'changes_pkt_data' effect for\nglobal sub-programs, such that the following program could be\nrejected:\n\n    int tail_call(struct __sk_buff *sk)\n    {\n    \tbpf_tail_call_static(sk, &jmp_table, 0);\n    \treturn 0;\n    }\n\n    SEC(\"tc\")\n    int not_safe(struct __sk_buff *sk)\n    {\n    \tint *p = (void *)(long)sk->data;\n    \t... make p valid ...\n    \ttail_call(sk);\n    \t*p = 42; /* this is unsafe */\n    \t...\n    }\n\nThe tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that\ncan invalidate packet pointers. Otherwise, it can't be freplaced with\ntailcall_freplace.c:entry_freplace() that does a tail call.",
  "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-2024-58237"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1692ee23dcaaddc24ba407b269707ee5df1301f"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1c2244437f9ad3dd91215f920401a14f2542dbfc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a4607ffba35bf2a630aab299e34dd3f6e658d70"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is a BPF verifier flaw triggered by loading a crafted eBPF program through the bpf() syscall; the resulting memory corruption occurs during local packet processing controlled by the attacker, requiring local access.\nAC:L - The attacker fully controls the malicious program, its subprogram/tail-call structure, and the heap grooming, so acceptance by the buggy verifier and the subsequent stale-pointer dereference are fully reliable with no attacker-uncontrolled conditions.\nPR:L - Reaching the flaw requires loading a packet-processing eBPF program (e.g., SCHED_CLS/tc) which needs the CAP_BPF/CAP_NET_ADMIN privilege over the BPF subsystem \u2014 a limited, delegatable privilege over the component rather than full root.\nUI:N - The attacker loads, attaches, and triggers the malicious program entirely on their own; no action by any other user is required.\nS:U - The verifier bypass corrupts kernel heap memory within the kernel's own security authority; there is no crossing into a different security scope such as a VM or IOMMU boundary.\nC:H - The stale packet pointer permits out-of-bounds reads of reallocated/adjacent kernel heap memory, allowing disclosure of sensitive kernel data.\nI:H - The verifier accepts a program that writes through a stale packet pointer (`*p = 42`), giving a controlled out-of-bounds write to kernel heap memory that can be leveraged into an arbitrary-write/control-flow-hijack primitive.\nA:H - Out-of-bounds reads/writes on reallocated kernel heap memory readily cause kernel memory corruption and panic/oops."
    }
  }
}