Unknown

CVE-2026-74694 — net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length

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.

Published Aug 22, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 12% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < e60afa01d35f8b2671b27ca93309921427144cce≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < 67c72b8ef63d9d9a610546fda30b116638f39745≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < 4489b4a17892750131e4bef4bc1d3d703c8fb5ba≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < 43c7d0a6917751ea898ae584d00f24f5deac46d4≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < b5231ad0b376b801ab8cf2962b182cc29deaedb3≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < 02226af69362758046822840fc6a497f5de33f00≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < 3a60b5af75abe8e3494ccd074fb4ae6e601a3e55≥ 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and < afa58b7384913c8773d837acdb07b035690ec5d2 and 1 more version 4.20	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 14, 2026
Affected products added · linux/linux
Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 14, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 14, 2026 · NIST National Vulnerability Database
CVE published
Aug 22, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

10 on the record

git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55
NIST National Vulnerability Database
git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4
NIST National Vulnerability Database
git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2
NIST National Vulnerability Database
github.com/advisories/GHSA-9677-c9p4-rgm3
GitHub Security Advisories
git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745
NIST National Vulnerability Database
git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00
NIST National Vulnerability Database
git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba
NIST National Vulnerability Database
git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3
NIST National Vulnerability Database
git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-74694
GitHub Security Advisories

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 10h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 10h
Unknown CVE-2026-98430 RDMA/efa: Keep admin queues alive while IRQ is registered 1d
Unknown CVE-2026-98431 RDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency 1d
Unknown CVE-2026-98429 RDMA/efa: Keep EQ resources alive while IRQ is registered 1d
Unknown CVE-2026-98428 ALSA: usb: 6fire: Avoid embedded URBs 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-74694 is "net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.