rxrpc: Fix irq-disabled in local_bh_enable()

{
  "id": "e2f283b8aaceecfce37c86e382808d851c4b4fd39da86a7b11c533243732abf6",
  "url": "https://osv.dev/vulnerability/CVE-2025-38525",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rxrpc: Fix irq-disabled in local_bh_enable()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix irq-disabled in local_bh_enable() The rxrpc_assess_MTU_size() function calls down into the IP layer to find out the MTU size for a route. When accepting an incoming call, this is called from rxrpc_new_incoming_call() which holds interrupts disabled across the code that calls down to it. Unfortunately, the IP layer uses local_bh_enable() which, config dependent, throws a warning if IRQs are enabled: WARNING: CPU: 1 PID: 5544 at kernel/softirq.c:387 __local_bh_enable_ip+0x43/0xd0 ... RIP: 0010:__local_bh_enable_ip+0x43/0xd0 ... Call Trace: rt_cache_route+0x7e/0xa0 rt_set_nexthop.isra.0+0x3b3/0x3f0 __mkroute_output+0x43a/0x460 ip_route_output_key_hash+0xf7/0x140 ip_route_output_flow+0x1b/0x90 rxrpc_assess_MTU_size.isra.0+0x2a0/0x590 rxrpc_new_incoming_peer+0x46/0x120 rxrpc_alloc_incoming_call+0x1b1/0x400 rxrpc_new_incoming_call+0x1da/0x5e0 rxrpc_input_packet+0x827/0x900 rxrpc_io_thread+0x403/0xb60 kthread+0x2f7/0x310 ret_from_fork+0x2a/0x230 ret_from_fork_asm+0x1a/0x30 ... hardirqs last enabled at (23): _raw_spin_unlock_irq+0x24/0x50 hardirqs last disabled at (24): _raw_read_lock_irq+0x17/0x70 softirqs last enabled at (0): copy_process+0xc61/0x2730 softirqs last disabled at (25): rt_add_uncached_list+0x3c/0x90 Fix this by moving the call to rxrpc_assess_MTU_size() out of rxrpc_init_peer() and further up the stack where it can be done without interrupts disabled. It shouldn't be a problem for rxrpc_new",
    "evidence": "osv:CVE-2025-38525",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
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    "severity": "high",
    "structured": {
      "id": "CVE-2025-38525",
      "aliases": [
        "CVE-2025-38525"
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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      "modified": "2026-10-28T02:30:21.062263307Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2029f21f10dedb88c0f86abffcf8d6c21dcf6040",
        "https://git.kernel.org/stable/c/8ac0b3baa7d8f732bd9e5cbf1d8b57e4802c6b36",
        "https://git.kernel.org/stable/c/d94b82d452ca27a200cd67660dc48476386651d8",
        "https://git.kernel.org/stable/c/e4d2878369d590bf8455e3678a644e503172eafa",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38525.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38525",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38525.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38525",
        "evidence": "/id"
      }
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487034,
  "published_at": "2025-08-16T11:12:19.191+00:00"
}