CVE-2024-43845

Harmless checksum over-read via truncated directory entry

Published Aug 17, 2024 · Updated Aug 5, 2026

Uninitialized memory use in Linux kernel 6.3 through 6.6.43 and 6.7 through 6.10.2 lets local users trigger a harmless checksum over-read. During udf_rename(), udf_update_tag() receives the on-stack diriter.fi containing only fileIdentDesc, then checksums absent impUse and name fields as random stack bytes. A local user must rename a directory on a writable UDF filesystem; udf_fiiter_write_fi() immediately recomputes the checksum from complete on-disk buffers, so no security consequence is reported.

CVSS severity3.3
Low
EPSS probability0.22%
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 6.3 through 6.6.43 and 6.7 through 6.10.2 lets local users trigger a harmless checksum over-read. During udf_rename(), udf_update_tag() receives the on-stack diriter.fi containing only fileIdentDesc, then checksums absent impUse and name fields as random stack bytes. A local user must rename a directory on a writable UDF filesystem; udf_fiiter_write_fi() immediately recomputes the checksum from complete on-disk buffers, so no security consequence is reported.

The record

CVE
CVE-2024-43845
Published
Aug 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2024CVE 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=626860c470ff88e5f7f22a282efd1bfe953a1b54 <9c439311c13fc6faab1921441165c9b8b500c83b
  2. Affected versionversion=6.3
  3. Affected versionversion=e9109a92d2a95889498bed3719cd2318892171a2 <27ab33854873e6fb958cb074681a0107cc2ecc4c
  4. Affected versionversion=e9109a92d2a95889498bed3719cd2318892171a2 <40d7b3ed52449d36143bab8d3e70926aa61a60f4
  5. Affected versionversion=e9109a92d2a95889498bed3719cd2318892171a2 <fe2ead240c31e8d158713beca9d0681a6e6a53ab

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=626860c470ff88e5f7f22a282efd1bfe953a1b54 <9c439311c13fc6faab1921441165c9b8b500c83b; version=6.3; version=e9109a92d2a95889498bed3719cd2318892171a2 <27ab33854873e6fb958cb074681a0107cc2ecc4c; version=e9109a92d2a95889498bed3719cd2318892171a2 <40d7b3ed52449d36143bab8d3e70926aa61a60f4; version=e9109a92d2a95889498bed3719cd2318892171a2 <fe2ead240c31e8d158713beca9d0681a6e6a53ab

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.3OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.8kernel.orgCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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