ghsa-mgqw-v2hw-3wq7
Vulnerability from github
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: __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]
{
"affected": [],
"aliases": [
"CVE-2025-40281"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-06T22:15:56Z",
"severity": null
},
"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 \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": "GHSA-mgqw-v2hw-3wq7",
"modified": "2025-12-07T00:30:56Z",
"published": "2025-12-07T00:30:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40281"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0e0413e3315199b23ff4aec295e256034cd0a6e4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1534ff77757e44bcc4b98d0196bc5c0052fce5fa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1cfa4eac275cc4875755c1303d48a4ddfe507ca8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/834e65be429c0fa4f9bb5945064bd57f18ed2187"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d0d858652834dcf531342c82a0428170aa7c2675"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ed71f801249d2350c77a73dca2c03918a15a62fe"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.