What’s Vulnerable › Vulnerabilities
CVE-2026-43494: net/rds: reset op_nents when zerocopy page pin fails
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-05-21 · updated 2026-10-19
- Weakness: CWE-415
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().
Affected products
- Linux kernel: from 4.17 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141
How to fix
Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.91. Check the vendor advisory for mitigations.
References
- https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113
- 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/c6e51512a784c4a7b86e1a044988696e3b3721fa
- https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6
- https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4
- https://github.com/v12-security/pocs/tree/main/pintheft
- http://www.openwall.com/lists/oss-security/2026/05/21/2
- https://access.redhat.com/security/cve/CVE-2026-43494
- https://bugzilla.redhat.com/show_bug.cgi?id=2480434
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