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().

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-43494
• https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4
• http://www.openwall.com/lists/oss-security/2026/05/21/2
• https://git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353
• https://git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479
• https://git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51
• https://git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799
• https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113
• https://git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fa
• https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6
• https://github.com/v12-security/pocs/tree/main/pintheft
• https://access.redhat.com/security/cve/CVE-2026-43494
• https://bugzilla.redhat.com/show_bug.cgi?id=2480434
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43494.json