{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-42067",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-42067"
  ],
  "published": "2024-07-29T15:53:08Z",
  "summary": "bpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock_ro()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock_ro()\n\nset_memory_rox() can fail, leaving memory unprotected.\n\nCheck return and bail out when bpf_jit_binary_lock_ro() returns\nan error.",
  "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-2024-42067"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/044da7ae7afd4ef60806d73654a2e6a79aa4ed7a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e60adf513275c3a38e5cb67f7fd12387e43a3ff5"
    }
  ],
  "database_specific": {
    "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 JIT is driven only from local syscalls \u2014 `setsockopt(SO_ATTACH_FILTER)`, `seccomp(SECCOMP_SET_MODE_FILTER)`, or `bpf()` \u2014 all requiring local access to the machine. No remote peer can cause a BPF program to be JIT-compiled.\nAC:L - The precondition is a page-table allocation failure inside `set_memory_rox()`, and memory pressure is something a local attacker directly influences by ballooning allocations while spraying thousands of concurrent filter attachments. Both sides of the condition are under attacker control, so this is not a state beyond their influence.\nPR:L - A completely unprivileged user reaches `bpf_int_jit_compile()` through `sk_attach_filter()` on any socket or through `seccomp()` under NO_NEW_PRIVS \u2014 no CAP_BPF, no CAP_NET_ADMIN, and no user namespace required. Only a basic local account is needed.\nUI:N - The attacker attaches the filter and triggers execution entirely from their own process. No victim action, mount, or file open is involved.\nS:U - The unprotected memory and the resulting crash or code injection are all within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - A failed lock leaves a writable, executable kernel page containing attacker-influenced JIT output, which is a direct kernel code-injection primitive when paired with any write; injected code yields arbitrary kernel memory disclosure. The loss of the read-only guarantee on executable memory is a full compromise of confidentiality in the worst case.\nI:H - On arm32 the JIT buffer stays RWX with attacker-chosen immediates embedded in it \u2014 precisely the JIT-spray/control-flow-hijack scenario that `bpf_jit_binary_lock_ro()` exists to prevent, permitting arbitrary kernel code execution. Kernel executable memory silently remaining writable is an integrity failure of the highest order.\nA:H - On s390 and x86-32 the buffer is allocated NX and only becomes executable via `set_memory_rox()`; on failure the JIT still sets `bpf_func`/`jited = 1`, so the first run of the filter faults on an instruction fetch from a non-executable page and oopses the kernel. An unprivileged user can repeat this to panic the system."
    }
  }
}