CVE-2026-74319

Local service hang via relocation ticket deadlock

Published Aug 15, 2026 · Updated Aug 15, 2026

Deadlock in zoned Btrfs relocation in Linux 7.1 allows local users to hang filesystem operations during data relocation. handle_reserve_tickets() waits for a space reservation ticket that relocation itself must satisfy by freeing space, creating a circular wait. Low-privileged local access and a zoned Btrfs filesystem undergoing data relocation are required; affected tasks can freeze without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in zoned Btrfs relocation in Linux 7.1 allows local users to hang filesystem operations during data relocation. handle_reserve_tickets() waits for a space reservation ticket that relocation itself must satisfy by freeing space, creating a circular wait. Low-privileged local access and a zoned Btrfs filesystem undergoing data relocation are required; affected tasks can freeze without data disclosure or modification.

The record

CVE
CVE-2026-74319
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=7.1
  2. Affected versionversion=e2a7fd22378f6500bcf979edc71e6837271eacfd <814c3b4ea357297c507158bceb07bcdc5fbe9808
  3. Affected versionversion=e2a7fd22378f6500bcf979edc71e6837271eacfd <f84dbbaa988e1344634a20ddf6c7d51a99f12477

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=e2a7fd22378f6500bcf979edc71e6837271eacfd <814c3b4ea357297c507158bceb07bcdc5fbe9808; version=e2a7fd22378f6500bcf979edc71e6837271eacfd <f84dbbaa988e1344634a20ddf6c7d51a99f12477

Published CVSS scores

5.5Red HatCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-833Deadlock
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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