CVE-2025-68742 (GCVE-0-2025-68742)
Vulnerability from cvelistv5
Published
2025-12-24 12:09
Modified
2025-12-24 12:09
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix invalid prog->stats access when update_effective_progs fails Syzkaller triggers an invalid memory access issue following fault injection in update_effective_progs. The issue can be described as follows: __cgroup_bpf_detach update_effective_progs compute_effective_progs bpf_prog_array_alloc <-- fault inject purge_effective_progs /* change to dummy_bpf_prog */ array->items[index] = &dummy_bpf_prog.prog ---softirq start--- __do_softirq ... __cgroup_bpf_run_filter_skb __bpf_prog_run_save_cb bpf_prog_run stats = this_cpu_ptr(prog->stats) /* invalid memory access */ flags = u64_stats_update_begin_irqsave(&stats->syncp) ---softirq end--- static_branch_dec(&cgroup_bpf_enabled_key[atype]) The reason is that fault injection caused update_effective_progs to fail and then changed the original prog into dummy_bpf_prog.prog in purge_effective_progs. Then a softirq came, and accessing the members of dummy_bpf_prog.prog in the softirq triggers invalid mem access. To fix it, skip updating stats when stats is NULL.
References
Impacted products
Vendor Product Version
Linux Linux Version: 492ecee892c2a4ba6a14903d5d586ff750b7e805
Version: 492ecee892c2a4ba6a14903d5d586ff750b7e805
Version: 492ecee892c2a4ba6a14903d5d586ff750b7e805
Version: 492ecee892c2a4ba6a14903d5d586ff750b7e805
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/filter.h",
            "kernel/bpf/syscall.c"
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              "version": "6.18.2",
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            {
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix invalid prog-\u003estats access when update_effective_progs fails\n\nSyzkaller triggers an invalid memory access issue following fault\ninjection in update_effective_progs. The issue can be described as\nfollows:\n\n__cgroup_bpf_detach\n  update_effective_progs\n    compute_effective_progs\n      bpf_prog_array_alloc \u003c-- fault inject\n  purge_effective_progs\n    /* change to dummy_bpf_prog */\n    array-\u003eitems[index] = \u0026dummy_bpf_prog.prog\n\n---softirq start---\n__do_softirq\n  ...\n    __cgroup_bpf_run_filter_skb\n      __bpf_prog_run_save_cb\n        bpf_prog_run\n          stats = this_cpu_ptr(prog-\u003estats)\n          /* invalid memory access */\n          flags = u64_stats_update_begin_irqsave(\u0026stats-\u003esyncp)\n---softirq end---\n\n  static_branch_dec(\u0026cgroup_bpf_enabled_key[atype])\n\nThe reason is that fault injection caused update_effective_progs to fail\nand then changed the original prog into dummy_bpf_prog.prog in\npurge_effective_progs. Then a softirq came, and accessing the members of\ndummy_bpf_prog.prog in the softirq triggers invalid mem access.\n\nTo fix it, skip updating stats when stats is NULL."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T12:09:39.341Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/539137e3038ce6f953efd72110110f03c14c7d97"
        },
        {
          "url": "https://git.kernel.org/stable/c/56905bb70c8b88421709bb4e32fcba617aa37d41"
        },
        {
          "url": "https://git.kernel.org/stable/c/2579c356ccd35d06238b176e4b460978186d804b"
        },
        {
          "url": "https://git.kernel.org/stable/c/7dc211c1159d991db609bdf4b0fb9033c04adcbc"
        }
      ],
      "title": "bpf: Fix invalid prog-\u003estats access when update_effective_progs fails",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68742",
    "datePublished": "2025-12-24T12:09:39.341Z",
    "dateReserved": "2025-12-24T10:30:51.030Z",
    "dateUpdated": "2025-12-24T12:09:39.341Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68742\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:29.147\",\"lastModified\":\"2025-12-24T13:16:29.147\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix invalid prog-\u003estats access when update_effective_progs fails\\n\\nSyzkaller triggers an invalid memory access issue following fault\\ninjection in update_effective_progs. The issue can be described as\\nfollows:\\n\\n__cgroup_bpf_detach\\n  update_effective_progs\\n    compute_effective_progs\\n      bpf_prog_array_alloc \u003c-- fault inject\\n  purge_effective_progs\\n    /* change to dummy_bpf_prog */\\n    array-\u003eitems[index] = \u0026dummy_bpf_prog.prog\\n\\n---softirq start---\\n__do_softirq\\n  ...\\n    __cgroup_bpf_run_filter_skb\\n      __bpf_prog_run_save_cb\\n        bpf_prog_run\\n          stats = this_cpu_ptr(prog-\u003estats)\\n          /* invalid memory access */\\n          flags = u64_stats_update_begin_irqsave(\u0026stats-\u003esyncp)\\n---softirq end---\\n\\n  static_branch_dec(\u0026cgroup_bpf_enabled_key[atype])\\n\\nThe reason is that fault injection caused update_effective_progs to fail\\nand then changed the original prog into dummy_bpf_prog.prog in\\npurge_effective_progs. Then a softirq came, and accessing the members of\\ndummy_bpf_prog.prog in the softirq triggers invalid mem access.\\n\\nTo fix it, skip updating stats when stats is NULL.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2579c356ccd35d06238b176e4b460978186d804b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/539137e3038ce6f953efd72110110f03c14c7d97\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56905bb70c8b88421709bb4e32fcba617aa37d41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7dc211c1159d991db609bdf4b0fb9033c04adcbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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