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CVE-2026-80521— af_unix: Unlink scc_entry in unix_del_edge().

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.

以下是该 Linux 内核漏洞描述信息的中文翻译： 在 Linux 内核中，已解决以下漏洞： af_unix：在 中解除关联 。 Kyle Zeng 报告称，垃圾回收（GC）可能会部分释放一个已死的强连通分量（SCC）。 具体场景如下： 1) 创建两个 SCC： X -. A <-> B ^--' 2) 并发执行以下操作： 2-1) 从 sk-X 向 sk-B 发送 到 sk-B 2-2) 同时关闭 A 和 B 在步骤 2-1) 中，存在一个微小的时间窗口： 已发布一条新边（B <-> B）供 GC 使用，但其对应

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 2 AI

T1225 T1412

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 4090fa373f0e763c43610853d2774b5979915959< e3702470ced94fad74d71e2232f022d2eb752a6d affected
4090fa373f0e763c43610853d2774b5979915959< 594d905195024b228c962627ae5ae7c17bd582a4 affected
5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a affected
de7921631ff323369aa63a4324695ab54ea4047e affected
6.1.141< 6.2 affected
6.6.93< 6.7 affected
6.10 affected
< 6.10 unaffected
… +2 more rows
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I. Basic Information for CVE-2026-80521

Vulnerability Information
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Vulnerability Title
af_unix: Unlink scc_entry in unix_del_edge().
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: af_unix: Unlink scc_entry in unix_del_edge(). Kyle Zeng reported that GC could free a dead SCC partially. The scenario is as follows: 1) Create two SCCs: X -. A <-> B ^--' 2) Run the following concurrently: 2-1) send() sk-B to sk-B from sk-X 2-2) close() both A and B At 2-1), there is a small window where unix_add_edges() publishes a new edge (B <-> B) to GC but its skb is not queued by skb_queue_tail(). If 2-2) completes before skb_queue_tail() and GC is triggered, it judges A <-> B as dead, but B is not freed because GC cannot collect the not-yet-queued skb holding the B <-> B edge. X -. A <-> B -. This edge is visible ^--' ^..' but skb is not This itself is not a problem since the next GC run will judge B as dead as well and free it finally. X -. A <.> B -. ^--' ^--' However, X's SCC forces the next GC to call unix_walk_scc_fast(), and it iterates over A through B's scc_entry. Let's unlink scc_entry before freeing the vertex in unix_del_edge().
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4090fa373f0e763c43610853d2774b5979915959 ~ e3702470ced94fad74d71e2232f022d2eb752a6d -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-80521

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III. Intelligence Information for CVE-2026-80521

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Patches & Fixes for CVE-2026-80521 (2)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80521

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