CVE-2023-53243

Read-only remount via multi-profile flag return

Published Sep 15, 2025 · Updated Sep 15, 2025

Denial of service in the Linux Btrfs subsystem allows local users to force a read-only remount during new block allocation. The btrfs_reduce_alloc_profile function omits DUP, RAID1C3, and RAID1C4 handling and can return multiple allocation flags where callers require exactly one. Triggering the abort requires canceling a conversion balance between unhandled profiles after the new profile has allocated a block; the filesystem then cannot resume that balance without another abort.

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

Denial of service in the Linux Btrfs subsystem allows local users to force a read-only remount during new block allocation. The btrfs_reduce_alloc_profile function omits DUP, RAID1C3, and RAID1C4 handling and can return multiple allocation flags where callers require exactly one. Triggering the abort requires canceling a conversion balance between unhandled profiles after the new profile has allocated a block; the filesystem then cannot resume that balance without another abort.

The record

CVE
CVE-2023-53243
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record 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=47e6f7423b9196ad6832d26cae52b7015f81ee7f <12b6d68498982a053a4a7e561a04387e57ca6f1a
  2. Affected versionversion=47e6f7423b9196ad6832d26cae52b7015f81ee7f <160fe8f6fdb13da6111677be6263e5d65e875987
  3. Affected versionversion=47e6f7423b9196ad6832d26cae52b7015f81ee7f <1b532748ba00bd2a1d9b09e0d5e81280582c7770
  4. Affected versionversion=47e6f7423b9196ad6832d26cae52b7015f81ee7f <4fadf53fa95142f01f215012e97c384529759a72
  5. Affected versionversion=47e6f7423b9196ad6832d26cae52b7015f81ee7f <a3fbd156bd2cd16e3c64e250ebce33eb9f2ef612
  6. Affected versionversion=5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=47e6f7423b9196ad6832d26cae52b7015f81ee7f <12b6d68498982a053a4a7e561a04387e57ca6f1a; version=47e6f7423b9196ad6832d26cae52b7015f81ee7f <160fe8f6fdb13da6111677be6263e5d65e875987; version=47e6f7423b9196ad6832d26cae52b7015f81ee7f <1b532748ba00bd2a1d9b09e0d5e81280582c7770; version=47e6f7423b9196ad6832d26cae52b7015f81ee7f <4fadf53fa95142f01f215012e97c384529759a72; version=47e6f7423b9196ad6832d26cae52b7015f81ee7f <a3fbd156bd2cd16e3c64e250ebce33eb9f2ef612; version=5.5

Published CVSS scores

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