Fragnesia Local Privilege Escalation report via ESP-in-TCP in the Linux Kernel
Bulletin ID: 2026-029-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 05/13/2026 18:45 PM PDT This is an ongoing issue. Information is subject to change. Please refer to our Security Bulletin (ID: 2026-030-AWS) for the most updated patching information. Description: Amazon is aware of CVE-2026-46300, a report of an additional privilege escalation issue in the Linux kernel related to the DirtyFrag, copy.fail class of issues (CVE-2026-43284). The proof of concept uses a vector via the loadable module espintcp. Amazon Linux does not provide this module, and is not affected. As defense in depth we will include a correctness patch to the core networking code to harden against possible similar issues in network protocol implementations that rely on this behavior.
CSIRTS triage
- What
- A privilege escalation vulnerability related to the DirtyFrag issue has been reported.
- Who is affected
- Users of affected Linux kernel versions.
- Urgency
- Remediation is important as it may allow privilege escalation.
- Action
- Apply the latest patches for the Linux kernel.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-029-aws/
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.
- Moderate exploitation riskCVE-2026-463009.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 95% of all EPSS-scored CVEs.
- Exploitation likely imminentCVE-2026-43284EPSS puts this in the most-targeted tier (93.2% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 99.8% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-46300 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-43284 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploited[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
- unknownexploitedOngoing updates on Copy.fail and variantsaws
- unknownMultiple vulnerabilities in Ubuntu Linux kernel (August 14, 2026)cert-fr-avis
- unknownUSN-8530-2: Linux kernel (HWE) vulnerabilitiesubuntu
- criticalHitachi Energy APM Edge Productcisa
- high[UPDATE] [high] Linux Kernel (Fragnesia): Vulnerability Allows Gaining Administrator Rightscert-bund
- highexploited[UPDATE] [high] Linux Kernel (Dirty Frag): Multiple vulnerabilities allow gaining administrator rightscert-bund
- unknownMultiple vulnerabilities in SUSE Linux kernel (July 31, 2026)cert-fr-avis
- unknownexploitedSiemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFPcisa
- high[NEW] [high] Oracle Communications: Multiple vulnerabilitiescert-bund
- unknownUSN-8616-1: Linux kernel (IBM) vulnerabilitiesubuntu
- highUSN-8569-1: Linux kernel (HWE) vulnerabilitiesubuntu
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