Status: KEV | Advisory ID: CVE-2026-46300
| CVE | CVE-2026-46300 |
| CVSS Score / Version | |
| Updated | 2026-10-29 |
| CVSS Vector | |
| CVSS Prose | |
| Affected products | |
| Exploitation status | |
| Classified as | |
| KEV listing | |
| Exploitation prediction (EPSS) | |
| Federal remediation deadline |
| Vendor | Product | Affected Versions | Patch Status |
|---|---|---|---|
| Linux | Linux Kernel | ||
| Red Hat | Red Hat Enterprise Linux 10 | ||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | ||
| Red Hat | Red Hat Enterprise Linux 8 | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9 | ||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | ||
| Red Hat | Red Hat OpenShift Container Platform 4.12 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.13 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.14 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.15 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.16 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.17 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.18 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.19 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.20 | ||
| Red Hat | Red Hat OpenShift Container Platform 4.21 | ||
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | ||
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | ||
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | ||
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | ||
| Red Hat | NVIDIA for RHEL 10 |
| Subsystems | Controllers & Field I/O, OT Supporting Infrastructure |
| Sectors | All Sectors |
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: preserve shared-frag marker during coalescing
skb_try_coalesce() can attach paged frags from @from to @to. If @from
has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same
externally-owned or page-cache-backed frags, but the shared-frag marker
is currently lost.
That breaks the invariant relied on by later in-place writers. In
particular, ESP input checks skb_has_shared_frag() before deciding
whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP
receive coalescing has moved shared frags into an unmarked skb, ESP can
see skb_has_shared_frag() as false and decrypt in place over page-cache
backed frags.
Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged
frags. The tailroom copy path does not need the marker because it copies
bytes into @to's linear data rather than transferring frag descriptors. (NVD)
Monitor Linux, Red Hat, and Siemens's web pages for any future patch releases. See vendor advisory link below.
| Source | Reference |
|---|---|
| NVD | https://nvd.nist.gov/vuln/detail/CVE-2026-46300 |
| CVE | https://www.cve.org/CVERecord?id=CVE-2026-46300 |
| Vendor advisory | https://cert-portal.siemens.com/productcert/html/ssa-019113.html |
| Field | Value |
|---|---|
| KEV Link | https://www.cisa.gov/known-exploited-vulnerabilities-catalog |
| Date Added to KEV | 2026-10-28 |
| Required Action Due Date | 2026-10-31 |
| Required Action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |