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CVE-2026-53365— vsock/virtio: fix zerocopy completion for multi-skb sends

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基金会开源的一款操作系统内核。 Linux kernel 6.7版本存在安全漏洞，该漏洞源于vsock/virtio中多skb发送时的零拷贝完成问题，可能导致非最终skb携带固定的用户页面且没有完成跟踪，如果循环提前中断则泄露固定页面且无完成通知。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 581512a6dc939ef122e49336626ae159f3b8a345< 293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9 affected
581512a6dc939ef122e49336626ae159f3b8a345< 76b995bc57bd90cb6e954e1966fbd8786da47f0d affected
581512a6dc939ef122e49336626ae159f3b8a345< b3155f2b78db21e99256bcf7eb902f24ff6d5338 affected
581512a6dc939ef122e49336626ae159f3b8a345< ae38d9179190a956e2a87a69ef1dd6f451b51c4d affected
6.7 affected
< 6.7 unaffected
6.12.97≤ 6.12.* unaffected
6.18.34≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-53365

Vulnerability Information
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Vulnerability Title
vsock/virtio: fix zerocopy completion for multi-skb sends
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix zerocopy completion for multi-skb sends When a large message is fragmented into multiple skbs, the zerocopy uarg is only allocated and attached to the last skb in the loop. Non-final skbs carry pinned user pages with no completion tracking, so the kernel has no way to notify userspace when those pages are safe to reuse. If the loop breaks early the uarg is never allocated at all, leaking pinned pages with no completion notification. Fix this by following the approach used by TCP: allocate the zerocopy uarg (if not provided by the caller) before the send loop and attach it to every skb via skb_zcopy_set(), which takes a reference per skb. Each skb's completion properly decrements the refcount, and the notification only fires after the last skb is freed. On failure, if no data was sent, the uarg is cleanly aborted via net_zcopy_put_abort(). This issue was initially discovered by sashiko while reviewing commit 1cb36e252211 ("vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting") but was pre-existing.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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基金会开源的一款操作系统内核。 Linux kernel 6.7版本存在安全漏洞，该漏洞源于vsock/virtio中多skb发送时的零拷贝完成问题，可能导致非最终skb携带固定的用户页面且没有完成跟踪，如果循环提前中断则泄露固定页面且无完成通知。
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 581512a6dc939ef122e49336626ae159f3b8a345 ~ 293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9 -
Linux Linux 6.7 -

II. Public POCs for CVE-2026-53365

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III. Intelligence Information for CVE-2026-53365

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Patches & Fixes for CVE-2026-53365 (4)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53365

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