CVE-2023-53810

Local privilege escalation via fscrypt keyslot race

Published Dec 9, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel 5.8 through 6.3.1 allows local users to execute code in kernel context via fscrypt I/O and key eviction. blk-mq releases the request's crypto keyslot only after bio_endio reports completion, so concurrent key eviction leaves stale key state that blk_crypto_reprogram_all_keys later dereferences. Exploitation requires local write access to an fscrypt-encrypted directory using per-file keys; the resulting kernel memory corruption enables privilege escalation or a kernel crash.

CVSS severity7.8
High
EPSS probability0.14%
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 Linux kernel 5.8 through 6.3.1 allows local users to execute code in kernel context via fscrypt I/O and key eviction. blk-mq releases the request's crypto keyslot only after bio_endio reports completion, so concurrent key eviction leaves stale key state that blk_crypto_reprogram_all_keys later dereferences. Exploitation requires local write access to an fscrypt-encrypted directory using per-file keys; the resulting kernel memory corruption enables privilege escalation or a kernel crash.

The record

CVE
CVE-2023-53810
Published
Dec 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.8
  2. Affected versionversion=a892c8d52c02284076fbbacae6692aa5c5807d11 <7d206ec7a04e8545828191b6ea8b49d3ea61391f
  3. Affected versionversion=a892c8d52c02284076fbbacae6692aa5c5807d11 <874bdf43b4a7dc5463c31508f62b3e42eb237b08
  4. Affected versionversion=a892c8d52c02284076fbbacae6692aa5c5807d11 <92d5d233b9ff531cf9cc36ab4251779e07adb633
  5. Affected versionversion=a892c8d52c02284076fbbacae6692aa5c5807d11 <9cd1e566676bbcb8a126acd921e4e194e6339603
  6. Affected versionversion=a892c8d52c02284076fbbacae6692aa5c5807d11 <b278570e2c59d538216f8b656e97680188a8fba4
  7. Affected versionversion=a892c8d52c02284076fbbacae6692aa5c5807d11 <d206f79d9cd658665b37ce8134c6ec849ac7af0c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=a892c8d52c02284076fbbacae6692aa5c5807d11 <7d206ec7a04e8545828191b6ea8b49d3ea61391f; version=a892c8d52c02284076fbbacae6692aa5c5807d11 <874bdf43b4a7dc5463c31508f62b3e42eb237b08; version=a892c8d52c02284076fbbacae6692aa5c5807d11 <92d5d233b9ff531cf9cc36ab4251779e07adb633; version=a892c8d52c02284076fbbacae6692aa5c5807d11 <9cd1e566676bbcb8a126acd921e4e194e6339603; version=a892c8d52c02284076fbbacae6692aa5c5807d11 <b278570e2c59d538216f8b656e97680188a8fba4; version=a892c8d52c02284076fbbacae6692aa5c5807d11 <d206f79d9cd658665b37ce8134c6ec849ac7af0c

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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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