net: qualcomm: rmnet: validate MAP frame length before ingress parsing

{
  "id": "6d747c9edcbdf531d373c2b1cecaec256a39b5152b7e35c7d0f35be66f93aa0a",
  "url": "https://osv.dev/vulnerability/CVE-2026-64550",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: qualcomm: rmnet: validate MAP frame length before ingress parsing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: validate MAP frame length before ingress parsing When ingress deaggregation is disabled, rmnet_map_ingress_handler() passes the skb straight to __rmnet_map_ingress_handler(), skipping the length validation that rmnet_map_deaggregate() performs on the aggregated path. The parser then dereferences the MAP header and csum header/trailer based on the on-wire pkt_len without checking skb->len, so a short frame is read out of bounds: BUG: KASAN: slab-out-of-bounds in rmnet_map_checksum_downlink_packet Read of size 1 at addr ffff88801118ed00 by task exploit/147 Call Trace: ... rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413) __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96) rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089) netif_receive_skb (net/core/dev.c:6460) tun_get_user (drivers/net/tun.c:1955) tun_chr_write_iter (drivers/net/tun.c:2001) vfs_write (fs/read_write.c:688) ksys_write (fs/read_write.c:740) do_syscall_64 (arch/x86/entry/syscall_64.c:94) ... Factor that validation out of rmnet_map_deaggregate() into rmnet_map_validate_packet_len() and run it on the no-aggregation path too. The MAP header is bounds-checked first, since this path can receive a frame shorter than the header.",
    "evidence": "osv:CVE-2026-64550",
    "products": [
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        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
    "structured": {
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      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H"
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      "modified": "2026-10-28T02:30:26.086583646Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/00f4c366dbca16a40772c3b7ec2d8cba839e9724",
        "https://git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299",
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        "https://git.kernel.org/stable/c/231a8a4b76cb1b1827b3b19d7b3603642f5aaaef",
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        "https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64550.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64550",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 492656,
  "published_at": "2026-07-27T20:10:39.459+00:00"
}