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Vulnerability record · CVE-2024-43845 · published 17 August 2024

CVE-2024-43845: Linux kernel use of uninitialized resource vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: udf: Fix bogus checksum computation in udf_rename() Syzbot reports uninitialized memory access in udf_rename() when updating checksum of '..' directory entry of a moved directory. This is indeed true as we pass on-stack diriter.fi to the udf_update_tag() and because that has only struct fileIdentDesc included in it and not the impUse or name fields, the checksumming function is going to checksum random stack contents beyond the end of the structure. This is actually harmless because the following udf_fiiter_write_fi() will recompute the checksum from on-disk buffers where everything is properly included. So all that is needed is just removing the bogus calculation.

3.3 CVSS 3.1 Low EPSS 0.22% · top 88.6% CWE-908 · Use of uninitialized resource
3.3CVSS 3.1 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
4 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: udf: Fix bogus checksum computation in udf_rename() Syzbot reports uninitialized memory access in udf_rename() when updating checksum of '..' directory entry of a moved directory. This is indeed true as we pass on-stack diriter.fi to the udf_update_tag() and because that has only struct fileIdentDesc included in it and not the impUse or name fields, the checksumming function is going to checksum random stack contents beyond the end of the structure. This is actually harmless because the following udf_fiiter_write_fi() will recompute the checksum from on-disk buffers where everything is properly included. So all that is needed is just removing the bogus calculation.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/27ab33854873e6fb958cb074681a0107cc2ecc4c Patch
https://git.kernel.org/stable/c/40d7b3ed52449d36143bab8d3e70926aa61a60f4 Patch
https://git.kernel.org/stable/c/9c439311c13fc6faab1921441165c9b8b500c83b Patch
https://git.kernel.org/stable/c/fe2ead240c31e8d158713beca9d0681a6e6a53ab Patch

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Source: NIST National Vulnerability Database (record CVE-2024-43845), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.