{
  "cveId": "CVE-2026-90359",
  "url": "https://patchblox.com/security/cve/CVE-2026-90359",
  "summary": "CVE-2026-90359 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-90359, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  bpf: Reject \u003E8 byte return values on return-read...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Reject \u003E8 byte return values on return-reading trampoline paths  btf_distill_func_proto() builds the function model used for the fentry/fexit/fmod_ret/fsession trampolines and struct_ops. It has accepted a 16-byte __int128 return value since the trampoline was introduced: __get_type_size() returns the integer\u0027s type size, and the return-type check only rejected ret \u003C 0.  But the BPF trampoline preserves only 8 bytes of the return value (RAX on x86, i.e. R0). For an attach type that reads the target\u0027s return value the second half (RDX / R3) is neither saved nor restored, so a program attached to a function returning a 16-byte value corrupts the value seen by the real caller and itself observes only half of it. struct_ops trampolines have the same limitation.  This affects the attach types that read the target\u0027s return value: fexit, fmod_ret and fsession (plus the _multi variants of fexit and fsession), and struct_ops. fentry/fentry_multi run before the target returns and are unaffected.  Reject a \u003E8 byte return value for these attach types in bpf_check_attach_target() and bpf_check_attach_btf_id_multi(), and for struct_ops in bpf_struct_ops_desc_init().",
  "published": "2026-09-17T17:17:34Z",
  "severity": "",
  "epss": 0.00201,
  "epssPercentile": 0.10025,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-90359",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90359",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90359",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90359",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}