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CVE-2026-43502— net/rds: handle zerocopy send cleanup before the message is queued

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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net/rds中零拷贝发送在消息入队前清理时错误推断零拷贝状态，可能导致页引用计数错误。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< e9aefdc5c53fe9aed108c14e3d155710a1bb14c9 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 46662f7dc59475995609bf3e9d27eb36f4acf26f affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 1e262db7675e27f42c3f3f47d6011855f4454f24 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 21d70744e6d3bbf9293aa1ee6fba7c53ad75275e affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 3abc8983b2bae3f487f77d9da5527d7d6b210d46 affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 14ef6fd18db2494098b21e0471bf27a1d8e9993e affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b affected
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3< 44b550d88b267320459d518c0743a241ab2108fa affected
… +10 more rows
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I. Basic Information for CVE-2026-43502

Vulnerability Information
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Vulnerability Title
net/rds: handle zerocopy send cleanup before the message is queued
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.
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net/rds中零拷贝发送在消息入队前清理时错误推断零拷贝状态，可能导致页引用计数错误。
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 ~ e9aefdc5c53fe9aed108c14e3d155710a1bb14c9 -
Linux Linux 4.17 -

II. Public POCs for CVE-2026-43502

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III. Intelligence Information for CVE-2026-43502

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Patches & Fixes for CVE-2026-43502 (8)

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-2026-43498 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-2026-43494 7.8 HIGH net/rds: reset op_nents when zerocopy page pin fails
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-2026-43502

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