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net/rds: reset op_nents when zerocopy page pin fails

Type: advisorySources: OSV

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().

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141, 7.0.10
CVEs
CVE-2026-43494
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 20:12 UTC · Revision 1

Source evidence

net/rds: reset op_nents when zerocopy page pin fails

core-osv · Original source

Published 21 May 2026, 10:49 UTC

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().

osv:CVE-2026-43494

Kernel

Fixed versions: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Complete source record
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  "url": "https://osv.dev/vulnerability/CVE-2026-43494",
  "method": "structured",
  "payload": {
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    "title": "net/rds: reset op_nents when zerocopy page pin fails",
    "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().",
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        "https://github.com/v12-security/pocs/tree/main/pintheft",
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43494.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43494",
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  "source_id": "core-osv",
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  "published_at": "2026-05-21T10:49:21.31+00:00"
}