CVE WatchJul 15, 2026

CVE-2026-46300

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coa

CVSS

7.8

High

EPSS

3.7%

p88

KEV

—

Exploit Today

0-100

Published: May 23, 2026 · Last modified: Jul 15, 2026 · CWE-787 · CWE-123

EPSS · 30d

3.7%EPSS · 30 days3.7%

2026-06-302026-07-16

Technical description

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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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99.8%

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