CVE-2023-52982

Mount-task hang via mismatched FS-Cache wait queues

Published Mar 27, 2025 · Updated May 11, 2026

A synchronization flaw in Linux 5.17 through 6.1.10 and 6.2-rc1 through 6.2-rc6 allows local users to hang FS-Cache volume acquisition. In fscache_wait_on_volume_collision(), wait_var_event() sleeps on a different wait queue from wake_up_bit(), so a delayed wake passes the timeout and the next wait never returns. Local access and an FS-Cache volume collision with a wake-up delayed beyond 20 seconds are required; the affected mount task then remains blocked indefinitely.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A synchronization flaw in Linux 5.17 through 6.1.10 and 6.2-rc1 through 6.2-rc6 allows local users to hang FS-Cache volume acquisition. In fscache_wait_on_volume_collision(), wait_var_event() sleeps on a different wait queue from wake_up_bit(), so a delayed wake passes the timeout and the next wait never returns. Local access and an FS-Cache volume collision with a wake-up delayed beyond 20 seconds are required; the affected mount task then remains blocked indefinitely.

The record

CVE
CVE-2023-52982
Published
Mar 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.17
  2. Affected versionversion=62ab63352350e881ae693a8236b35d7d0516c78b <3be069f42a7b79d3149194f21cdf24bf23864cac
  3. Affected versionversion=62ab63352350e881ae693a8236b35d7d0516c78b <8226e37d82f43657da34dd770e2b38f20242ada7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=62ab63352350e881ae693a8236b35d7d0516c78b <3be069f42a7b79d3149194f21cdf24bf23864cac; version=62ab63352350e881ae693a8236b35d7d0516c78b <8226e37d82f43657da34dd770e2b38f20242ada7

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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