CVE-2024-0443: Kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.
Vulnerability summary
CVE-2024-0443 is a medium (CVSS 5.5) vulnerability in fedoraproject fedora. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.3% 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 3Timeline
- 11-01-2024PublishedVulnerability first disclosed.
- 26-10-2026Last modifiedVulnerability information updated.
Description
A flaw was found in the blkgs destruction path in block/blk-cgroup.c in the Linux kernel, leading to a cgroup blkio memory leakage problem. When a cgroup is being destroyed, cgroup_rstat_flush() is only called at css_release_work_fn(), which is called when the blkcg reference count reaches 0. This circular dependency will prevent blkcg and some blkgs from being freed after they are made offline. This issue may allow an attacker with a local access to cause system instability, such as an out of memory error.
CVSS metrics
4 scores · 4 sources · 1 version- 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
0.25%
Chance of exploitation in the next 30 days
Percentile
16%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.25% 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 cause- CWE-402Transmission of Private Resources into a New SphereThe product makes resources available to untrusted parties when those resources are only intended to be accessed by the product.
- CWE-668Exposure of Resource to Wrong SphereThe product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu61 products
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
- linux-aws-5.13All versions (No fix recorded)
- linux-aws-5.19All versions (No fix recorded)
Debian1 product
- linux< 6.3.11-1
Fedoraproject1 product
- fedoraEOL39
Linux1 product
- linux_kernel≥ 6.2, < 6.4 | 6.4:rc1 | 6.4:rc2 | 6.4:rc3 | 6.4:rc4 | 6.4:rc5 | 6.4:rc6
Redhat1 product
- enterprise_linux8.0 | 9.0
5 vendors · 65 products
References
10 links- bugzilla.redhat.com/show_bug.cgi?id=2257968Issue TrackingX Refsource REDHATREPORTThird Party Advisory
