{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89579",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89579"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "bpf: Harden bloom filter sizing and indexing on 32-bit kernels",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Harden bloom filter sizing and indexing on 32-bit kernels\n\nbloom_map_alloc() has two 32-bit-specific problems when the computed\nbitmap reaches the U32_MAX fallback case.\n\nFirst, BITS_TO_BYTES(U32_MAX) is evaluated with 32-bit arithmetic. The\naddition performed by DIV_ROUND_UP wraps, so the map allocates only the\nfixed-size bloom filter object while keeping bitset_mask == U32_MAX.\nSubsequent updates can then write past the allocated object.\n\nSecond, fixing only the allocation size is not sufficient. The bloom hash\nis a u32, but set_bit() takes a signed long bit number and x86 test_bit()\neventually feeds the index to variable_test_bit(long, ...). On 32-bit\nkernels, hashes in [0x80000000, U32_MAX] therefore become negative bit\noffsets. x86 bt/bts with a memory operand interpret those offsets relative\nto the supplied base, so a map with bitset_mask == U32_MAX can read or\nwrite before bloom->bitset even after allocating the full 512 MiB bitmap.\n\nKeep the U32_MAX fallback, but split each hash into a word pointer and an\nin-word bit number before calling test_bit() or set_bit(). The bitops\nargument is then always in [0, BITS_PER_LONG - 1], while BIT_WORD(h) still\nselects the intended word in the full bitmap.\n\nCompute the bitset size from (u64)bitset_mask + 1 before passing the final\nsize to bpf_map_area_alloc(). This fixes the original under-allocation and\nkeeps the allocated storage consistent with the addressable bitset.\n\nExploitation note: local privilege escalation is possible on a 32-bit x86\nkernel using the under-allocation bug from a binary with CAP_BPF.",
  "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-2026-89579"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a6183bc683f97f4317f7e84939ca7fff37c5688b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/80551bf8912c42d1e3d55eec6fa3c40f306c3de8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b7a13eccfcf97714ffc1ca6aa663d66d4a30e29"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/272fcb4ba6fab678db0eb966dc81c4c804bef64a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dff481e12b3f127739f6a4ea7cef2c25dc12e056"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/11c1e836710dcba03e50454a4eedfdbaf8d3050e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only via local bpf(2) syscalls: BPF_MAP_CREATE of BPF_MAP_TYPE_BLOOM_FILTER, then BPF_MAP_UPDATE_ELEM/LOOKUP_ELEM which call bloom_map_push_elem/peek_elem. Per kernel CNA guidance BPF is Local, not network-reachable.\nAC:L - On a 32-bit kernel the attacker deterministically forces the U32_MAX bitmap fallback with a large max_entries so BITS_TO_BYTES wraps and under-allocates; BPF_F_ZERO_SEED and chosen values then drive set_bit/test_bit to selected out-of-bounds indexes with no race or uncontrolled layout.\nPR:L - Creating a bloom-filter map requires CAP_BPF in map_create_alloc (bpf_token_capable). Per kernel guidance this is Low because CAP_BPF is obtainable via user namespaces and BPF token delegation, not only init-namespace root.\nUI:N - The attacker creates the undersized bloom map and issues lookup/update syscalls from their own process; no victim action such as mounting a filesystem or opening a file is required.\nS:U - The out-of-bounds bit set/test corrupts kernel heap around the undersized bloom object on the same host. This is standard kernel memory corruption and privilege escalation, not a VM escape or IOMMU boundary bypass.\nC:H - With bitset_mask==U32_MAX and a near-empty allocation, bloom_map_peek_elem's test_bit is an out-of-bounds kernel bit-read oracle, and the matching OOB writes enable heap disclosure; kernel guidance rates such memory corruption as High confidentiality impact.\nI:H - bloom_map_push_elem's set_bit writes past (and on 32-bit x86, before) the allocated object across a huge range, a controllable OOB write. The fix commit documents local privilege escalation from CAP_BPF on 32-bit x86.\nA:H - The same unbounded set_bit/test_bit indexes unmapped pages around the undersized kmalloc object and reliably produces a kernel oops or panic, which is High availability impact per kernel guidance."
    }
  }
}