CVE-2023-53165

Spurious filename hash via uninitialized buffer read

Published Sep 15, 2025 · Updated Sep 15, 2025

Uninitialized memory use in Linux kernel UDF filename conversion allows local users to generate spurious hashes via crafted names. In udf_name_from_CS0, a length check permits zero-length output before reading str_o[0], so the conversion logic consults an uninitialized buffer byte when deciding whether a CRC-based unification hash is needed. The path requires processing a UDF name beginning with a period and measuring two through five characters; the reported practical consequence is an unnecessary filename prefix, not data disclosure or corruption.

CVSS severity5.5
Medium
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

Uninitialized memory use in Linux kernel UDF filename conversion allows local users to generate spurious hashes via crafted names. In udf_name_from_CS0, a length check permits zero-length output before reading str_o[0], so the conversion logic consults an uninitialized buffer byte when deciding whether a CRC-based unification hash is needed. The path requires processing a UDF name beginning with a period and measuring two through five characters; the reported practical consequence is an unnecessary filename prefix, not data disclosure or corruption.

The record

CVE
CVE-2023-53165
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <008ae78d1e12efa904dc819b1ec83e2bca6b2c56
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <028f6055c912588e6f72722d89c30b401bbcf013
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3f1368af47acf4d0b2a5fb0d2c0d6919d2234b6d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4503f6fc95d6dee85fb2c54785848799e192c51c
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d50988da0db167aed6f38685145cb5cd526c4f8
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <985f9666698960dfc87a106d6314203fa90fda75
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a6824149809395dfbb5bc36bc7057cc3cb84e56d
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b37f998d357102e8eb0f8eeb33f03fff22e49cbf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <008ae78d1e12efa904dc819b1ec83e2bca6b2c56; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <028f6055c912588e6f72722d89c30b401bbcf013; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3f1368af47acf4d0b2a5fb0d2c0d6919d2234b6d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4503f6fc95d6dee85fb2c54785848799e192c51c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d50988da0db167aed6f38685145cb5cd526c4f8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <985f9666698960dfc87a106d6314203fa90fda75; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a6824149809395dfbb5bc36bc7057cc3cb84e56d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b37f998d357102e8eb0f8eeb33f03fff22e49cbf

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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

CWE-908Use of Uninitialized Resource

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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