CVE-2020-8428: linux linux_kernel Use After Free
Vulnerability summary
CVE-2020-8428 is a high (CVSS 7.1) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 52.4% of scored vulnerabilities.
Not severe (CVSS 7.1, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 21 · Related 15Timeline
- 28-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.68%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.68% 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.
Ubuntu32 products
- linux< 4.15.0-96.97 | < 4.4.0-177.207
- linux-aws< 4.15.0-1065.69 | < 4.4.0-1065.69 | < 4.4.0-1105.116
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-hwe< 4.15.0-1065.69~16.04.1
- linux-azure< 4.15.0-1077.82~14.04.1 | < 4.15.0-1077.82 | < 5.0.0-1036.38
Debian1 product
- linux< 5.4.19-1
Linux1 product
- linux_kernel≥ 4.19, < 5.5
3 vendors · 34 products
References
28 links- www.openwall.com/lists/oss-security/2020/01/28/2X Refsource MISCREPORTMailing ListThird Party Advisory
- github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6X Refsource MISCPatchThird Party Advisory
- security.netapp.com/advisory/ntap-20200313-0003/X Refsource CONFIRM
