High severity7.8NVD Advisory· Published May 21, 2026· Updated Jul 23, 2026
CVE-2026-43494
CVE-2026-43494
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().
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8- osv-coords2 versions
>= 4.17.0, < 5.10.258+ 1 more
- (no CPE)range: >= 4.17.0, < 5.10.258
- (no CPE)range: < 7.0.11-1.1
Patches
Vulnerability mechanics
References
13- git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113nvdPatch
- git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353nvdPatch
- git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479nvdPatch
- git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51nvdPatch
- git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799nvdPatch
- git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fanvdPatch
- git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6nvdPatch
- git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4nvdPatch
- github.com/v12-security/pocs/tree/main/pintheftnvdExploitThird Party Advisory
- www.openwall.com/lists/oss-security/2026/05/21/2nvdMailing List
- access.redhat.com/security/cve/CVE-2026-43494nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43494.jsonnvd
News mentions
1- Impact of Linux Kernel vulnerabilities on B&R productsCISA ICS Advisories