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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 02226af69362758046822840fc6a497f5de33f00, 3a60b5af75abe8e3494ccd074fb4ae6e601a3e55, 43c7d0a6917751ea898ae584d00f24f5deac46d4; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 02226af69362758046822840fc6a497f5de33f00, 3a60b5af75abe8e3494ccd074fb4ae6e601a3e55, 43c7d0a6917751ea898ae584d00f24f5deac46d4; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Aug 22, 2026
Updated
Oct 14, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.20affected
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before e60afa01d35f8b2671b27ca93309921427144cceaffected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before 67c72b8ef63d9d9a610546fda30b116638f39745affected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before 4489b4a17892750131e4bef4bc1d3d703c8fb5baaffected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before 43c7d0a6917751ea898ae584d00f24f5deac46d4affected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before b5231ad0b376b801ab8cf2962b182cc29deaedb3affected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before 02226af69362758046822840fc6a497f5de33f00affected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before 3a60b5af75abe8e3494ccd074fb4ae6e601a3e55affected · git
    • 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 and later · before afa58b7384913c8773d837acdb07b035690ec5d2affected · git
    • before 4.20not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.9-17.1.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74692Aug 22, 2026 · net/smc: fix TOCTOU race between smc_listen_out() and listener close
    30Monitor
  • ← EarlierCVE-2026-74693Aug 22, 2026 · net: prestera: validate firmware header length
    0Monitor
  • Later →CVE-2026-74695Aug 22, 2026 · netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux02226af69362758046822840fc6a497f5de33f00Vendor (CNA)
Linux Linux3a60b5af75abe8e3494ccd074fb4ae6e601a3e55Vendor (CNA)
Linux Linux43c7d0a6917751ea898ae584d00f24f5deac46d4Vendor (CNA)
Linux Linux4489b4a17892750131e4bef4bc1d3d703c8fb5baVendor (CNA)
Linux Linux67c72b8ef63d9d9a610546fda30b116638f39745Vendor (CNA)
Linux Linuxafa58b7384913c8773d837acdb07b035690ec5d2Vendor (CNA)
Linux Linuxb5231ad0b376b801ab8cf2962b182cc29deaedb3Vendor (CNA)
Linux Linuxe60afa01d35f8b2671b27ca93309921427144cceVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records