CVE-2026-68125: mac802154: llsec: reject frames shorter than the authentication tag

mediumCVSS 6.5CVE-2026-68125

CSIRTS triage

vendor: Linux product: Linux Kernel Denial of service

What: The mac802154 LLSEC implementation does not reject frames shorter than the authentication tag, allowing malformed frame processing.
Who is affected: Systems running affected versions of the Linux kernel with IEEE 802.15.4 LLSEC enabled.
Urgency: Medium severity (CVSS 6.5); can cause denial of service or unexpected behavior in 802.15.4 deployments.
Action: Apply Linux kernel patch rejecting undersized frames in mac802154 LLSEC or update to a patched version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68125

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-681250.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68125	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for mac802154

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-72024: In the Linux kernel, the following vulnerability has been resolved: mac802154: remove interfac…nvd · 2026-08-15
mediumCVE-2026-68126: mac802154: hold an interface reference across the scan workermsrc · 2026-08-11
unknownCVE-2026-68126: In the Linux kernel, the following vulnerability has been resolved: mac802154: hold an interfa…nvd · 2026-08-10
highCVE-2026-68125: In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: reject f…nvd · 2026-08-10
highCVE-2026-63831: In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: add skb_…nvd · 2026-07-19
highCVE-2026-63831: mac802154: llsec: add skb_cow_data() before in-place cryptomsrc · 2026-07-14