{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72110",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72110"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "bpf,fork: wipe ->bpf_storage before bailouts that access it",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,fork: wipe ->bpf_storage before bailouts that access it\n\nCurrently, copy_process() can bail out to free_task() before p->bpf_storage\nhas been initialized, with this call graph (shown here for the\n!CONFIG_MEMCG case):\n\ncopy_process\n  dup_task_struct\n    arch_dup_task_struct\n      [copies the entire task_struct, including ->bpf_storage member]\n  [RLIMIT_NPROC check fails]\n  delayed_free_task\n    free_task\n      bpf_task_storage_free\n        rcu_dereference(task->bpf_storage)\n        bpf_local_storage_destroy\n\nIn this case, the nascent task's ->bpf_storage member that\nbpf_local_storage_destroy() operates on is a plain copy of the parent's\n->bpf_storage pointer, not a real initialized pointer.\nThis leads to badness (kernel hangs, UAF).\n\nThis is reachable as long as the process calling fork() has been inserted\ninto a task storage map.",
  "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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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72110"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7df67a4799067a59e6a2d53f8059a6be6e73e678"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aff686efd38728e06daf12417a0d7ed454ce4cff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9cff220ddb65b022cc668bb652200742476e744c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c4f626ddf2350652ad2f79daf1f10847f3f6eabd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43f0005f81b8ce3be962d653cde8db9022f1e9b0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b51a6155d14389876916726430da30eabb1d4ed"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached via fork()/clone()/clone3() into copy_process() and free_task()->bpf_task_storage_free(); per kernel guidance BPF/fork paths are Local and no network-facing handler can drive this early-bailout teardown.\nAC:L - The attacker controls all conditions: dup_task_struct copies parent ->bpf_storage, then they can deterministically force early copy_process failure (setrlimit(RLIMIT_NPROC) plus fork, fork-until-EAGAIN, or nr_threads exhaustion) to hit bpf_local_storage_destroy on the copied pointer.\nPR:L - Exploitation needs only a local process already inserted into a BPF task storage map (sched_ext/tracing BPF on servers, or BPF loaded via user-namespace CAP_BPF/unprivileged BPF); fork itself needs no real-root capability, so PR:L per user-namespace guidance.\nUI:N - No victim action is required; the attacker triggers the failed fork on a process they run and control the bailout timing themselves.\nS:U - Impact is in-kernel UAF/heap corruption and denial of service on the parent task's BPF local storage; this is standard kernel memory corruption without VM, container, or IOMMU boundary crossing.\nC:H - Destroying the parent's live bpf_local_storage via the child's stale ->bpf_storage pointer is a use-after-free; freed bpf_local_storage/bpf_local_storage_elem objects can be reclaimed for arbitrary kernel memory disclosure per UAF guidance.\nI:H - bpf_local_storage_destroy() unlinks and frees parent storage still referenced by the live forking task, enabling heap grooming and attacker-controlled writes over freed BPF local storage structures for privilege escalation.\nA:H - The fix commit reports kernel hangs and UAF; tearing down active BPF task local storage during failed fork can oops, panic, or deadlock the system, satisfying High availability impact for kernel crashes/UAF."
    }
  }
}