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CVE-2026-43502 (ZcopyReaper) is a local privilege-escalation vulnerability in the Linux kernel Reliable Datagram Sockets (RDS) zero-copy send path. A zero-copy send may fail after user pages have been pinned but before its message is associated with the sending socket. The vulnerable rds_message_purge() logic infers zero-copy ownership from socket association rather than the zero-copy notifier. Consequently, an unqueued message can be released as ordinary payload storage while retaining zero-copy page ownership state, producing an ownership/lifetime error and use-after-free condition. The upstream correction uses the captured zero-copy notifier as the cleanup discriminator; for unqueued messages, it releases pinned-page accounting and notifier state before releasing payload-page references.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel local privilege-escalation vulnerability in the RDS zero-copy send path. Incorrect cleanup of pinned user-space pages when a zero-copy send fails before its message is attached to a socket can cause kernel-memory corruption and enable an unprivileged local attacker to obtain root-level privileges.
A Linux kernel local privilege-escalation vulnerability in the RDS zero-copy send path. Incorrect cleanup of pinned user-space pages when an RDS zero-copy send fails before socket attachment can corrupt kernel memory, enabling an unprivileged local attacker to potentially obtain root-level control.
A Linux kernel local privilege-escalation vulnerability in the Reliable Datagram Sockets (RDS) zero-copy send cleanup path. An early send failure can cause cleanup to mishandle pinned pages and take an incorrect ownership path, resulting in a use-after-free that the ZcopyReaper proof of concept demonstrated can yield root privileges.
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Cross-references every affected SKU, including bundled OEM variants.
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