CVE-2026-74694 (GCVE-0-2026-74694)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-22 15:32
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length
ncsi_send_cmd_nl() takes the number of bytes to copy from the
attacker-controlled ncsi_pkt_hdr.length field of the in-band packet
header, while the source buffer is the NCSI_ATTR_DATA netlink
attribute whose readable size is nla_len() - sizeof(ncsi_pkt_hdr).
The two length sources are never cross-checked: only
nla_len() >= sizeof(struct ncsi_pkt_hdr) is enforced.
With hdr->length set larger than the attribute payload (up to 65535
against at most 2032 readable bytes), ncsi_cmd_handler_oem() copies
past the end of the netlink attribute buffer with unsafe_memcpy(),
leaking up to ~64KB of kernel heap memory into the transmitted NCSI
command packet. The destination skb is sized by the declared payload,
so the write side does not overflow - this is a pure OOB read /
information leak, reachable with CAP_NET_ADMIN on systems with a
registered NCSI device (e.g. OpenBMC on Aspeed BMC SoCs, where
NET_NCSI=y is standard).
Reject commands whose declared payload extends past the end of the
data attribute.
The issue was found by the autokbug dynamic kernel fuzzer at Tencent
Yunding Lab.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 Version: 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 |
||
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length\n\nncsi_send_cmd_nl() takes the number of bytes to copy from the\nattacker-controlled ncsi_pkt_hdr.length field of the in-band packet\nheader, while the source buffer is the NCSI_ATTR_DATA netlink\nattribute whose readable size is nla_len() - sizeof(ncsi_pkt_hdr).\nThe two length sources are never cross-checked: only\nnla_len() \u003e= sizeof(struct ncsi_pkt_hdr) is enforced.\n\nWith hdr-\u003elength set larger than the attribute payload (up to 65535\nagainst at most 2032 readable bytes), ncsi_cmd_handler_oem() copies\npast the end of the netlink attribute buffer with unsafe_memcpy(),\nleaking up to ~64KB of kernel heap memory into the transmitted NCSI\ncommand packet. The destination skb is sized by the declared payload,\nso the write side does not overflow - this is a pure OOB read /\ninformation leak, reachable with CAP_NET_ADMIN on systems with a\nregistered NCSI device (e.g. OpenBMC on Aspeed BMC SoCs, where\nNET_NCSI=y is standard).\n\nReject commands whose declared payload extends past the end of the\ndata attribute.\n\nThe issue was found by the autokbug dynamic kernel fuzzer at Tencent\nYunding Lab."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-22T15:32:57.113Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce"
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"url": "https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745"
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{
"url": "https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3"
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{
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{
"url": "https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2"
}
],
"title": "net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length",
"x_generator": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-74694",
"datePublished": "2026-08-22T15:32:57.113Z",
"dateReserved": "2026-08-15T05:44:03.926Z",
"dateUpdated": "2026-08-22T15:32:57.113Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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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