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CVE-2026-53361— af_unix: Set gc_in_progress to true in unix_gc().

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存在安全漏洞，该漏洞源于af_unix在unix_gc()中未正确设置gc_in_progress标志，可能导致GC与MSG_PEEK操作混淆。

CVSS 7.1 · High EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5< 20aa894d475bd8086b25c1113ec4ca70f70c7a98 affected
328840c93bd6a4871dd10908d01b41eab83eb8e2< 82c17e13d404f686e164590483fd6c1abaa675d0 affected
8b90a9f819dc2a06baae4ec1a64d875e53b824ec< 591f1ac217428a6d2b32a8ac14aac0fab44f155a affected
8b90a9f819dc2a06baae4ec1a64d875e53b824ec< 0cfa78c050662784fc8e3ab26dbfd1dc632b2082 affected
8b90a9f819dc2a06baae4ec1a64d875e53b824ec< d82ba05263c69fa2437fe93e4e561cc40f4c03af affected
6.1.141< 6.1.183 affected
6.6.93< 6.6.144 affected
6.9 affected
… +6 more rows
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I. Basic Information for CVE-2026-53361

Vulnerability Information
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Vulnerability Title
af_unix: Set gc_in_progress to true in unix_gc().
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: af_unix: Set gc_in_progress to true in unix_gc(). Igor Ushakov reported that unix_gc() could run with gc_in_progress being false if the work is scheduled while running: Thread 1 Thread 2 Thread 3 -------- -------- -------- unix_schedule_gc() unix_schedule_gc() `- if (!gc_in_progress) `- if (!gc_in_progress) |- gc_in_progress = true | `- queue_work() | unix_gc() <----------------/ | | |- gc_in_progress = true ... `- queue_work() | | `- gc_in_progress = false | | unix_gc() <---------------------------------------------' | ... /* gc_in_progress == false */ | `- gc_in_progress = false unix_peek_fpl() relies on gc_in_progress not to confuse GC by MSG_PEEK. Let's set gc_in_progress to true in unix_gc().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于af_unix在unix_gc()中未正确设置gc_in_progress标志，可能导致GC与MSG_PEEK操作混淆。
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 ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5 ~ 20aa894d475bd8086b25c1113ec4ca70f70c7a98 -
Linux Linux 6.9 -

II. Public POCs for CVE-2026-53361

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III. Intelligence Information for CVE-2026-53361

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Patches & Fixes for CVE-2026-53361 (4)

Same Patch Batch · Linux · 2026-07-04 · 4 CVEs total

CVE-2026-53360 8.8 HIGH KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use
CVE-2026-53359 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected role
CVE-2026-53362 7.8 HIGH ipv6: account for fraggap on the paged allocation path

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53361

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