HIGH · CVSS 7.8
ACTIVELY EXPLOITED
PATCH AVAILABLE
CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability
| Vendor | Linux |
|---|---|
| Product | Kernel |
| CVSS score | 7.8 · CVSS 3.1 · HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 16.1% (percentile 97) |
| Actively exploited | Yes |
| Added to CISA KEV | 28 Oct 2026 |
| CISA federal deadline | 31 Oct 2026 |
| Weakness (CWE) | CWE-123, CWE-456, CWE-787 |
| NVD published | 23 May 2026 |
| NVD last modified | 29 Oct 2026 |
| NVD status | Analyzed |
Affected versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Redhat Openshift Container Platform | from 4.12 before 4.12.91 | 4.12.91 |
| Redhat Openshift Container Platform | from 4.13 before 4.13.67 | 4.13.67 |
| Redhat Openshift Container Platform | from 4.14 before 4.14.68 | 4.14.68 |
| Redhat Openshift Container Platform | from 4.15 before 4.15.65 | 4.15.65 |
| Redhat Openshift Container Platform | from 4.16 before 4.16.63 | 4.16.63 |
| Redhat Openshift Container Platform | from 4.17 before 4.17.55 | 4.17.55 |
| Redhat Openshift Container Platform | from 4.18 before 4.18.43 | 4.18.43 |
| Redhat Openshift Container Platform | from 4.19 before 4.19.33 | 4.19.33 |
| Redhat Openshift Container Platform | from 4.20 before 4.20.24 | 4.20.24 |
| Redhat Openshift Container Platform | from 4.21 before 4.21.17 | 4.21.17 |
| Linux Linux Kernel | from 5.11 before 5.15.208 | 5.15.208 |
| Linux Linux Kernel | from 5.16 before 6.1.174 | 6.1.174 |
| Linux Linux Kernel | from 6.7 before 6.12.91 | 6.12.91 |
| Linux Linux Kernel | from 6.13 before 6.18.33 | 6.18.33 |
| Linux Linux Kernel | from 6.2 before 6.6.141 | 6.6.141 |
| Linux Linux Kernel | from 6.19 before 7.0.10 | 7.0.10 |
| Linux Linux Kernel | from 3.9 up to 5.10.257 | – |
| Linux Linux Kernel | 7.1 | – |
| Linux Linux Kernel | 7.1 | – |
| Linux Linux Kernel | 7.1 | – |
+20 more
Required action (CISA's text)
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.
Description (NVD)
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.
SOURCES
Other Linux flaws
- CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability
- CVE-2025-39964: Linux Kernel Race Condition Vulnerability
- CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
- CVE-2026-53362: Linux Kernel Unspecified Vulnerability
- CVE-2022-0995: Linux Kernel Out-of-Bounds Write Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 29 Oct 2026.