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CVE-2026-89487 is a Linux kernel Open vSwitch flaw caused by invoking skb_tx_error() on a packet buffer borrowed for a failed USERSPACE upcall while that buffer remains live and can continue through subsequent flow actions. The call clears zero-copy state, including SKBFL_SHARED_FRAG, despite the packet not being freed. For MSG_ZEROCOPY packets containing page-cache fragments, removal of this flag suppresses the copy-on-write protection relied upon by ESP-in-UDP input before in-place AEAD decryption. A subsequent local ESP-in-UDP processing path can therefore decrypt in place into page-cache-backed data not owned by the sender, creating the Fragnesia unauthorized page-cache write primitive.
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A CVE assigned to the reported Linux kernel/Open vSwitch shared-fragment-marker stripping vulnerability and its associated fixes. The flaw enables a deterministic local privilege escalation under the stated conditions by enabling a page-cache write primitive during ESP processing.
A locally exploitable Debian Linux vulnerability affecting Debian Linux 12.0, 13.0, and 14.0. The supplied CVSS v3 vector indicates low attack complexity, low privileges required, no user interaction, and high integrity and availability impact.
A Linux kernel Open vSwitch flaw in which an erroneous skb_tx_error() call clears SKBFL_SHARED_FRAG from a still-forwarded MSG_ZEROCOPY packet. This can bypass the copy-on-write protection expected by ESP-in-UDP processing and enable an unprivileged page-cache write primitive.
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Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.