Actively exploited in the wild
Linux Kernel Missing Initialization of a Variable Vulnerability
Linux - Kernel · Listed in the CISA KEV since 2026-10-28. This indicates confirmed attacks in production environments.
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.
CVE-2026-46300
HighCVSS 7.8KEVExploitation Probability (EPSS)
Very high risk97th percentile - higher than 97% of all known CVEs
Summary
In the Linux kernel, during skb coalescing in skb_try_coalesce(), the SKBFL_SHARED_FRAG marker is not propagated, breaking an invariant for later in-place writers. This can cause ESP processing errors where data is decrypted in place over page-cache backed frags.
Risk Assessment
This vulnerability may allow an attacker to manipulate data in page cache, potentially leading to information disclosure or privilege escalation.
Recommendation
Apply a Linux kernel patch that propagates the SKBFL_SHARED_FRAG marker during skb coalescing.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS