CVE-2009-4020: linux linux_kernel
Vulnerability summary
CVE-2009-4020 is a high (CVSS 7.8) vulnerability in linux linux_kernel. EPSS estimates a 4.76% chance of exploitation in the next 30 days, higher than 91.9% of scored vulnerabilities.
Not severe (CVSS 7.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4Timeline
- 04-12-2009PublishedVulnerability first disclosed.
- 07-08-2024Last modifiedVulnerability information updated.
Description
Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a crafted Hierarchical File System (HFS) filesystem, related to the hfs_readdir function in fs/hfs/dir.c.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
4.76%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.76% 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: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.
Linux1 product
- linux_kernel2.6.32
1 vendor · 1 product
References
15 links- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10091VDB EntrySignatureX Refsource OVAL
- support.avaya.com/css/P8/documents/100073666X Refsource CONFIRM
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6750VDB EntrySignatureX Refsource OVAL
- bugzilla.redhat.com/show_bug.cgi?id=540736X Refsource CONFIRM
- userweb.kernel.org/~akpm/mmotm/broken-out/hfs-fix-a-potential-buffer-overflow.patchX Refsource CONFIRMPatch
