CVE-2023-53662: ext4: fix memory leaks in ext4_fname_{setup_filename,prepare_lookup}
Vulnerability summary
CVE-2023-53662 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% 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 28 · Related 27Timeline
- 07-10-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leaks in ext4_fname_{setup_filename,prepare_lookup} If the filename casefolding fails, we'll be leaking memory from the fscrypt_name struct, namely from the 'crypto_buf.name' member. Make sure we free it in the error path on both ext4_fname_setup_filename() and ext4_fname_prepare_lookup() functions.
CVSS metrics
4 scores · 3 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
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.16% 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.
Ubuntu111 products
- linux< 5.15.0-176.186
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1105.112
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1ae98e295fa2577fb5e492200c58d10230e00e99, < 98fc9c2cc45cfcb56961a73de3ec69b474063fc0 | ≥ 1ae98e295fa2577fb5e492200c58d10230e00e99, < 1fb3f1bbfdb511034b0360dbeb0f6a8424ed2a5c | ≥ 1ae98e295fa2577fb5e492200c58d10230e00e99, < 36daf050be3f6f067631dc52054de2d3b7cc849f | ≥ 1ae98e295fa2577fb5e492200c58d10230e00e99, < 7ca4b085f430f3774c3838b3da569ceccd6a0177 | 5.13
- linux_kernel≥ 5.13, < 6.1.54 | ≥ 6.2, < 6.5.4
Debian1 product
- linux< 6.1.55-1 | < 6.5.6-1
3 vendors · 114 products
