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CVE-2026-43494— net/rds: reset op_nents when zerocopy page pin fails

AI Predicted 5.5 Difficulty: Moderate EPSS 0.03% · P10

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 9115669faedccdda100428e2d26fd0aac8c50799affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 0bbbff00a15b1df2cac9014d6cf4b6890f473353affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 640e37f58f991546a87540d067279c2c1fa9fe51affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 290e833d1acb1093bc121fcdc97f5e6161157479affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< e174929793195e0cd6a4adb0cad731b39f9019b4affected
4.17affected
< 4.17unaffected
6.6.141≤ 6.6.*unaffected
… +4 more rows
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I. Basic Information for CVE-2026-43494

Vulnerability Information
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Vulnerability Title
net/rds: reset op_nents when zerocopy page pin fails
Source: NVD (National Vulnerability Database)
Vulnerability 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().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rds_message_zcopy_from_user函数中零拷贝页面固定失败时未重置op_nents，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 ~ 9115669faedccdda100428e2d26fd0aac8c50799 -
LinuxLinux 4.17 -

II. Public POCs for CVE-2026-43494

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III. Intelligence Information for CVE-2026-43494

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Patches & Fixes for CVE-2026-43494 (5)

Same Patch Batch · Linux · 2026-05-21 · 8 CVEs total

CVE-2026-43502net/rds: handle zerocopy send cleanup before the message is queued
CVE-2026-43501ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
CVE-2026-43498accel/ivpu: Disallow re-exporting imported GEM objects
CVE-2026-43499rtmutex: Use waiter::task instead of current in remove_waiter()
CVE-2026-43497fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free
CVE-2026-43496net/sched: sch_red: Replace direct dequeue call with peek and qdisc_dequeue_peeked
CVE-2026-43495net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43494

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