UBUNTU-CVE-2026-43494
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().
02 / AFFECTED SOFTWARE
Affected packages
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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().
05 / REFERENCES
Further evidence
- http://www.openwall.com/lists/oss-security/2026/05/21/2
- https://git.kernel.org/linus/e174929793195e0cd6a4adb0cad731b39f9019b4
- https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4
- https://ubuntu.com/security/CVE-2026-43494
- https://ubuntu.com/security/notices/USN-8370-1
- https://ubuntu.com/security/notices/USN-8371-1
- https://ubuntu.com/security/notices/USN-8373-1
- https://ubuntu.com/security/notices/USN-8374-1
- https://ubuntu.com/security/notices/USN-8388-1
- https://ubuntu.com/security/notices/USN-8388-2
- https://ubuntu.com/security/notices/USN-8389-1
- https://ubuntu.com/security/notices/USN-8391-1
- https://ubuntu.com/security/notices/USN-8392-1
- https://ubuntu.com/security/notices/USN-8393-1
- https://ubuntu.com/security/notices/USN-8426-1
- https://ubuntu.com/security/notices/USN-8426-2
- https://ubuntu.com/security/notices/USN-8440-1
- https://ubuntu.com/security/notices/USN-8461-1
- https://ubuntu.com/security/notices/USN-8462-1
- https://ubuntu.com/security/notices/USN-8489-1
- https://ubuntu.com/security/notices/USN-8497-1
- https://ubuntu.com/security/notices/USN-8499-1
- https://ubuntu.com/security/notices/USN-8528-1
- https://ubuntu.com/security/notices/USN-8569-1
- https://ubuntu.com/security/notices/USN-8616-1
- https://www.cve.org/CVERecord?id=CVE-2026-43494