{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40281",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40281"
  ],
  "published": "2025-12-06T21:53:16Z",
  "summary": "sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto\n\nsyzbot reported a possible shift-out-of-bounds [1]\n\nBlamed commit added rto_alpha_max and rto_beta_max set to 1000.\n\nIt is unclear if some sctp users are setting very large rto_alpha\nand/or rto_beta.\n\nIn order to prevent user regression, perform the test at run time.\n\nAlso add READ_ONCE() annotations as sysctl values can change under us.\n\n[1]\n\nUBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41\nshift exponent 64 is too large for 32-bit type 'unsigned int'\nCPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025\nCall Trace:\n <TASK>\n  __dump_stack lib/dump_stack.c:94 [inline]\n  dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120\n  ubsan_epilogue lib/ubsan.c:233 [inline]\n  __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494\n  sctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509\n  sctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502\n  sctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338\n  sctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline]\n  sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]",
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