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

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.8 · High EPSS 0.30% · P22

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< c6e51512a784c4a7b86e1a044988696e3b3721fa affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 03014551938a0887fa55f18ce49b70158a9c0113 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< d84ce1786ce40fdd3dd98db47aec5527817e1ef6 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 9115669faedccdda100428e2d26fd0aac8c50799 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 0bbbff00a15b1df2cac9014d6cf4b6890f473353 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 640e37f58f991546a87540d067279c2c1fa9fe51 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 290e833d1acb1093bc121fcdc97f5e6161157479 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< e174929793195e0cd6a4adb0cad731b39f9019b4 affected
… +10 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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 ~ c6e51512a784c4a7b86e1a044988696e3b3721fa -
Linux Linux 4.17 -

II. Public POCs for CVE-2026-43494

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6784 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-43494

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Patches & Fixes for CVE-2026-43494 (8)

Proof of Concept for CVE-2026-43494 (1)

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

CVE-2026-43501 9.8 CRITICAL ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
CVE-2026-43495 8.8 HIGH net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler
CVE-2026-43502 7.8 HIGH net/rds: handle zerocopy send cleanup before the message is queued
CVE-2026-43498 7.8 HIGH accel/ivpu: Disallow re-exporting imported GEM objects
CVE-2026-43499 7.8 HIGH rtmutex: Use waiter::task instead of current in remove_waiter()
CVE-2026-43497 7.3 HIGH fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free
CVE-2026-43496 net/sched: sch_red: Replace direct dequeue call with peek and qdisc_dequeue_peeked

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43494

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