CVE-2025-40281 (GCVE-0-2025-40281)
Vulnerability from cvelistv5
Published
2025-12-06 21:51
Modified
2025-12-06 21:51
Severity ?
VLAI Severity ?
EPSS score ?
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
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b Version: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b |
||
{
"containers": {
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{
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"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]"
}
],
"providerMetadata": {
"dateUpdated": "2025-12-06T21:51:05.208Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0e0413e3315199b23ff4aec295e256034cd0a6e4"
},
{
"url": "https://git.kernel.org/stable/c/834e65be429c0fa4f9bb5945064bd57f18ed2187"
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{
"url": "https://git.kernel.org/stable/c/abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a"
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{
"url": "https://git.kernel.org/stable/c/d0d858652834dcf531342c82a0428170aa7c2675"
},
{
"url": "https://git.kernel.org/stable/c/ed71f801249d2350c77a73dca2c03918a15a62fe"
},
{
"url": "https://git.kernel.org/stable/c/1cfa4eac275cc4875755c1303d48a4ddfe507ca8"
},
{
"url": "https://git.kernel.org/stable/c/aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d"
},
{
"url": "https://git.kernel.org/stable/c/1534ff77757e44bcc4b98d0196bc5c0052fce5fa"
}
],
"title": "sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto",
"x_generator": {
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}
},
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"cveId": "CVE-2025-40281",
"datePublished": "2025-12-06T21:51:05.208Z",
"dateReserved": "2025-04-16T07:20:57.184Z",
"dateUpdated": "2025-12-06T21:51:05.208Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
}
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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.
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