CVE-2026-43494
ANALYSIS PENDINGnet/rds: reset op_nents when zerocopy page pin fails
Title source: cnaExploitation Summary
EIP tracks 3 public exploits for CVE-2026-43494. PoCs published by Unclecheng-li, 0xBlackash, Koshmare-Blossom.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-43494, leveraging a double-free vulnerability in the Linux kernel's RDS zcopy mechanism combined with io_uring to achieve local privilege escalation (LPE). The exploit manipulates page references, bypasses kernel protections like init_on_alloc, and overwrites page cache to execute arbitrary code as root.
Description
In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().
Exploits (3)
This repository contains a functional exploit for CVE-2026-43494, leveraging a double-free vulnerability in the Linux kernel's RDS zcopy mechanism combined with io_uring to achieve local privilege escalation (LPE). The exploit manipulates page references, bypasses kernel protections like init_on_alloc, and overwrites page cache to execute arbitrary code as root.
This repository contains a functional local privilege escalation exploit for CVE-2026-43494, leveraging a double-free bug in the Linux kernel's RDS subsystem combined with io_uring to achieve page cache overwrite of SUID-root binaries.
This repository contains a functional exploit for CVE-2026-43494, leveraging io_uring and RDS (Reliable Datagram Sockets) to achieve local privilege escalation (LPE) by manipulating page cache refcounts and overwriting SUID binaries.