CVE-2023-52631: fs/ntfs3: Fix an NULL dereference bug
Vulnerability summary
CVE-2023-52631 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 13.2% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 14 · Related 14Timeline
- 02-04-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix an NULL dereference bug The issue here is when this is called from ntfs_load_attr_list(). The "size" comes from le32_to_cpu(attr->res.data_size) so it can't overflow on a 64bit systems but on 32bit systems the "+ 1023" can overflow and the result is zero. This means that the kmalloc will succeed by returning the ZERO_SIZE_PTR and then the memcpy() will crash with an Oops on the next line.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.22% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu104 products
- linux< 5.15.0-106.116
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1061.67
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < ae4acad41b0f93f1c26cc0fc9135bb79d8282d0b | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < ec1bedd797588fe38fc11cba26d77bb1d9b194c6 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < fb7bcd1722bc9bc55160378f5f99c01198fd14a7 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < 686820fe141ea0220fc6fdfc7e5694f915cf64b2 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < b2dd7b953c25ffd5912dda17e980e7168bebcf6c | 5.15
- linux_kernel≥ 5.15, < 5.15.149 | ≥ 5.16, < 6.1.78 | ≥ 6.2, < 6.6.17 | ≥ 6.7, < 6.7.5 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3
Debian1 product
- linux< 6.1.82-1 | < 6.7.7-1
3 vendors · 107 products
