{
  "cveId": "CVE-2026-45839",
  "url": "https://patchblox.com/security/cve/CVE-2026-45839",
  "summary": "CVE-2026-45839 is fixed in 70 products on 1 platform, first by ALAS2023-2026-1882, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "bpf: reject negative CO-RE accessor indices in bpf_core_parse_spec()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: reject negative CO-RE accessor indices in bpf_core_parse_spec()  CO-RE accessor strings are colon-separated indices that describe a path from a root BTF type to a target field, e.g. \u00220:1:2\u0022 walks through nested struct members. bpf_core_parse_spec() parses each component with sscanf(\u0022%d\u0022), so negative values like -1 are silently accepted.  The subsequent bounds checks (access_idx \u003E= btf_vlen(t)) only guard the upper bound and always pass for negative values because C integer promotion converts the __u16 btf_vlen result to int, making the comparison (int)(-1) \u003E= (int)(N) false for any positive N.  When -1 reaches btf_member_bit_offset() it gets cast to u32 0xffffffff, producing an out-of-bounds read far past the members array.  A crafted BPF program with a negative CO-RE accessor on any struct that exists in vmlinux BTF (e.g. task_struct) crashes the kernel deterministically during BPF_PROG_LOAD on any system with CONFIG_DEBUG_INFO_BTF=y (default on major distributions).  The bug is reachable with CAP_BPF:   BUG: unable to handle page fault for address: ffffed11818b6626  #PF: supervisor read access in kernel mode  #PF: error_code(0x0000) - not-present page  Oops: Oops: 0000 [#1] SMP KASAN NOPTI  CPU: 0 UID: 0 PID: 85 Comm: poc Not tainted 7.0.0-rc6 #18 PREEMPT(full)  RIP: 0010:bpf_core_parse_spec (tools/lib/bpf/relo_core.c:354)  RAX: 00000000ffffffff  Call Trace:   \u003CTASK\u003E   bpf_core_calc_relo_insn (tools/lib/bpf/relo_core.c:1321)   bpf_core_apply (kernel/bpf/btf.c:9507)   check_core_relo (kernel/bpf/verifier.c:19475)   bpf_check (kernel/bpf/verifier.c:26031)   bpf_prog_load (kernel/bpf/syscall.c:3089)   __sys_bpf (kernel/bpf/syscall.c:6228)   \u003C/TASK\u003E  CO-RE accessor indices are inherently non-negative (struct member index, array element index, or enumerator index), so reject them immediately after parsing.",
  "published": "2026-05-27T11:16:23Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00136,
  "epssPercentile": 0.03045,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45839",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.175-219.357.amzn2023",
      "fix": "ALAS2023-2026-1882",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1882",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.175-219.357.amzn2023",
      "fix": "ALAS2023-2026-1882",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1882",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.92-122.166.amzn2023",
      "fix": "ALAS2023-2026-1894",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1894",
      "released": "2026-06-22T09:00:00Z"
    },
    {
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      "product": "bpftool6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.92-122.166.amzn2023",
      "fix": "ALAS2023-2026-1894",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1894",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
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      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
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      "released": "2026-06-22T09:00:00Z"
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      "product": "kernel",
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      "fix": "ALAS2023-2026-1882",
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      "released": "2026-07-21T17:09:27Z"
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