CVE-2026-43494
net/rds: reset op_nents when zerocopy page pin fails
- Published
- May 21, 2026
- Updated
- Oct 16, 2026
- Assigning CNA
- Linux
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 8.5%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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().
Sources
- CVE-2026-43494-PinTheft-PoCExploit
Proof-of-concept for CVE-2026-43494 (PinTheft): Linux LPE via RDS zerocopy refcount bug + io_uring fixed buffers → SUID page-cache overwrite. Authorized research only.
- PinTheft-goExploit
A Go implementation of PinTheft (CVE-2026-43494)
Proof-of-concept for CVE-2026-43494 (PinTheft): Linux kernel local privilege escalation exploiting an RDS zerocopy reference-count bug with io_uring fixed buffers to overwrite SUID binary page cache.
Responsible use
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