CVE-2023-53307

Invalid kernel memory access via premature rbd ownership

Published Sep 16, 2025 · Updated May 11, 2026

Use-after-free in the Linux kernel rbd driver allows local users to access freed memory when rbd device creation fails. The do_rbd_add() path retains rbd_client, spec, and opts after rbd_dev_create() prematurely takes ownership and frees them on ID-allocation or work-queue setup failure. Reachability requires local privileges to request an rbd device and the exceptional creation failure; the published record demonstrates no bounded effect beyond invalid kernel memory access.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel rbd driver allows local users to access freed memory when rbd device creation fails. The do_rbd_add() path retains rbd_client, spec, and opts after rbd_dev_create() prematurely takes ownership and frees them on ID-allocation or work-queue setup failure. Reachability requires local privileges to request an rbd device and the exceptional creation failure; the published record demonstrates no bounded effect beyond invalid kernel memory access.

The record

CVE
CVE-2023-53307
Published
Sep 16, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 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=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <71da2a151ed1adb0aea4252b16d81b53012e7afd
  2. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <9787b328c42c13c4f31e7d5042c4e877e9344068
  3. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <a73783e4e0c4d1507794da211eeca75498544dff
  4. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <ae16346078b1189aee934afd872d9f3d0a682c33
  5. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <cc8c0dd2984503ed09efa37bcafcef3d3da104e8
  6. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <e3cbb4d60764295992c95344f2d779439e8b34ce
  7. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <f7c4d9b133c7a04ca619355574e96b6abf209fba
  8. Affected versionversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <faa7b683e436664fff5648426950718277831348
  9. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <71da2a151ed1adb0aea4252b16d81b53012e7afd; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <9787b328c42c13c4f31e7d5042c4e877e9344068; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <a73783e4e0c4d1507794da211eeca75498544dff; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <ae16346078b1189aee934afd872d9f3d0a682c33; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <cc8c0dd2984503ed09efa37bcafcef3d3da104e8; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <e3cbb4d60764295992c95344f2d779439e8b34ce; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <f7c4d9b133c7a04ca619355574e96b6abf209fba; version=1643dfa4c2c827d6e2aa419df8c17b0f24090278 <faa7b683e436664fff5648426950718277831348; version=4.9

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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