fkie_cve-2025-40281
Vulnerability from fkie_nvd
Published
2025-12-06 22:15
Modified
2025-12-08 18:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto syzbot reported a possible shift-out-of-bounds [1] Blamed commit added rto_alpha_max and rto_beta_max set to 1000. It is unclear if some sctp users are setting very large rto_alpha and/or rto_beta. In order to prevent user regression, perform the test at run time. Also add READ_ONCE() annotations as sysctl values can change under us. [1] UBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41 shift exponent 64 is too large for 32-bit type 'unsigned int' CPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:233 [inline] __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494 sctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509 sctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502 sctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338 sctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e0413e3315199b23ff4aec295e256034cd0a6e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1534ff77757e44bcc4b98d0196bc5c0052fce5fa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cfa4eac275cc4875755c1303d48a4ddfe507ca8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/834e65be429c0fa4f9bb5945064bd57f18ed2187
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0d858652834dcf531342c82a0428170aa7c2675
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed71f801249d2350c77a73dca2c03918a15a62fe
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 \u0027unsigned int\u0027\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 \u003cTASK\u003e\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]"
    }
  ],
  "id": "CVE-2025-40281",
  "lastModified": "2025-12-08T18:26:49.133",
  "metrics": {},
  "published": "2025-12-06T22:15:56.113",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0e0413e3315199b23ff4aec295e256034cd0a6e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1534ff77757e44bcc4b98d0196bc5c0052fce5fa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1cfa4eac275cc4875755c1303d48a4ddfe507ca8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/834e65be429c0fa4f9bb5945064bd57f18ed2187"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0d858652834dcf531342c82a0428170aa7c2675"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed71f801249d2350c77a73dca2c03918a15a62fe"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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