bpf: Fix sleepable check for tracing/lsm prog

{
  "id": "e62085e0f531b053954afa5aba9ed4fb18a9bc50d8282f0fe15f9c56ee271e24",
  "url": "https://osv.dev/vulnerability/CVE-2026-90299",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Fix sleepable check for tracing/lsm prog",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Fix sleepable check for tracing/lsm prog When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog is allowed to attach to '__x64_'-alike prefix symbols. It is because the verifier does not verify whether the symbol is a kernel function or a bpf prog. That said, a sleepable tracing prog is allowed to attach to a bpf prog target whose name has '__x64_'-alike prefix. For example, a sleepable fentry prog attaches to a '__x64_sys_nop' XDP prog, and copies buffer from a user pointer with bpf_copy_from_user() helper. After attaching the XDP prog to lo interface, the kernel BUG could be triggered by 'ping -c 1 -W 1 127.0.0.1': [ 3.460756] BUG: sleeping function called from invalid context at kernel/bpf/trampoline.c:1324 Fix it by disallowing sleepable prog always when its target btf is not a kernel's btf.",
    "evidence": "osv:CVE-2026-90299",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90299",
      "aliases": [
        "CVE-2026-90299"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "16d9c5660692d6f0e6aba367274de2b6dfd4343c"
                },
                {
                  "fixed": "976f1be72740cfbc351d3841fd21186dda3ea723"
                },
                {
                  "fixed": "00244bdaa423d93f4571f3f6854378ce3365e524"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90299.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.1.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90299.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.191708853Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/00244bdaa423d93f4571f3f6854378ce3365e524",
        "https://git.kernel.org/stable/c/976f1be72740cfbc351d3841fd21186dda3ea723",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90299.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90299",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90299.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90299",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 517630,
  "published_at": "2026-09-17T16:08:23.888+00:00"
}