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CVE-2026-90049 is a Linux kernel networking flaw in which skb_zerocopy() invokes skb_tx_error() on its source skb after skb_orphan_frags() fails. The source skb remains owned by its caller, but skb_tx_error() destructively completes its zerocopy user argument and clears SKBFL_ALL_ZEROCOPY, including the SKBFL_SHARED_FRAG ownership marker. In the Open vSwitch userspace-action path, a failed userspace upcall may be ignored and the same skb can continue through later forwarding actions. If it is subsequently processed by local ESP input, the cleared shared-fragment marker can cause ESP to decrypt in place rather than first copying non-private fragments. This permits modification of shared page-cache-backed fragments before ESP authentication fails.
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A Linux kernel local privilege-escalation issue in the Open vSwitch forwarding/upcall error path. A failed userspace upcall can clear SKBFL_SHARED_FRAG from a still-forwarded MSG_ZEROCOPY packet, permitting ESP in-place decryption to overwrite shared page-cache-backed file data.
A resolved Linux kernel networking flaw in skb_zerocopy() where destructive error handling was applied to a source skb not owned by the copy helper. Under an Open vSwitch userspace-action error path, this can prematurely mark producer buffers as free and clear shared-fragment ownership state while the skb continues through networking actions, potentially allowing ESP decryption over non-private fragments.
A vulnerability tracked as CVE-2026-90049 affecting Debian Linux 12.0, 13.0, and 14.0. The supplied record characterizes it as unpatched and provides a CVSS v3 vector indicating high confidentiality, integrity, and availability impact, although no flaw mechanism is described.
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Cross-references every affected SKU, including bundled OEM variants.
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