{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-42068",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-42068"
  ],
  "published": "2024-07-29T15:53:08Z",
  "summary": "bpf: Take return from set_memory_ro() into account with bpf_prog_lock_ro()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Take return from set_memory_ro() into account with bpf_prog_lock_ro()\n\nset_memory_ro() can fail, leaving memory unprotected.\n\nCheck its return and take it into account as an 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-2024-42068"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a359696856ca9409fb97655c5a8ef0f549cb6e03"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e4f602e3ff749ba770bf8ff10196e18358de6720"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/05412471beba313ecded95aa17b25fe84bb2551a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7d2cc63eca0c993c99d18893214abf8f85d566d8"
    }
  ],
  "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 - BPF program loading is reachable only through local syscalls \u2014 `setsockopt(SO_ATTACH_FILTER)`, `seccomp()`/`prctl(PR_SET_SECCOMP)`, and `bpf(BPF_PROG_LOAD)`. No remote peer can drive `bpf_prog_select_runtime()`.\nAC:L - A local attacker can repeatedly load interpreted BPF programs in a loop while driving the machine into reclaim pressure, which is the condition that makes `split_large_page()`'s page-table allocation fail and return -ENOMEM out of `set_memory_ro()`. Memory pressure is attacker-influenceable rather than a state outside the attacker's control, so the higher-severity value applies.\nPR:L - `SO_ATTACH_FILTER` in net/core/sock.c:1465 has no capability check at all, and the seccomp path is gated only by `no_new_privs`, which any unprivileged task can set \u2014 so an ordinary user, including one inside a container or sandbox, reaches the vulnerable code with zero capabilities.\nUI:N - The attacker loads and attaches the BPF program entirely within its own process; no other user or victim action is involved.\nS:U - The unprotected memory and the resulting compromise are both within the kernel's own security authority \u2014 this is standard kernel privilege escalation, not a hypervisor or IOMMU boundary crossing.\nC:H - Kernel memory that the hardening design requires to be read-only remains writable, and the introducing commit 60a3b2253c41 states that a modifiable interpreter image yields \"arbitrary read/write memory access\"; rewriting the `insnsi[]` stream turns the BPF interpreter into an arbitrary kernel-memory read primitive.\nI:H - The unprotected region contains both the executed eBPF bytecode and the `bpf_func` function pointer, so the lost `set_memory_ro()` gives an attacker a path to arbitrary kernel writes and arbitrary function calls \u2014 exactly the integrity guarantee this code exists to enforce.\nA:H - A BPF program whose instruction stream or `bpf_func` pointer can be altered executes attacker-chosen kernel control flow, trivially producing an oops or panic, so the availability impact of the lost protection is a full kernel crash."
    }
  }
}