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CVE-2026-68121: pppoe: reload header pointer after dev_hard_header()

criticalCVSS 9.8CVE-2026-68121

CSIRTS triage

vendor: Linuxproduct: Linux KernelMemory corruption
What
The pppoe driver fails to reload the header pointer after dev_hard_header(), leading to potential memory corruption.
Who is affected
Systems running affected Linux kernel versions with pppoe driver enabled.
Urgency
Critical severity (CVSS 9.8) and not yet exploited; patch immediately.
Action
Update to a patched Linux kernel version that addresses CVE-2026-68121.

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
critical — CVSS 9.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68121

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-68121coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for pppoe

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.

More from Microsoft Security Response Center