CVE-2020-25639: fedoraproject fedora NULL Pointer Dereference
Vulnerability summary
CVE-2020-25639 is a medium (CVSS 4.9) NULL Pointer Dereference vulnerability in fedoraproject fedora. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30.4% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 4.4, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 19 · Related 17Timeline
- 04-03-2021PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
Description
A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in versions prior to 5.12-rc1 in the way the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw allows a local user to crash the system.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · DebianEcosystem advisory · calculated4.4MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- NVDNIST4.4MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.37%
Chance of exploitation in the next 30 days
Percentile
30%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.37% 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
1 foundExploit Reference (bugzilla.redhat.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu40 products
- linux< 5.4.0-73.82
- linux-aws< 5.4.0-1048.50
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1048.50~18.04.1
Redhat3 products
- enterprise_linuxEOL5.0 | 6.0 | 7.0 | 8.0
- messaging_realtime_grid2.0
- openshift_container_platform4.4 | 4.5 | 4.6
Debian1 product
- linux< 5.10.19-1
Fedoraproject1 product
- fedoraEOL32 | 33
Linux1 product
- linux_kernel≤ 5.11.2
5 vendors · 46 products
References
12 links- bugzilla.redhat.com/show_bug.cgi?id=1876995X Refsource MISCExploitIssue TrackingThird Party Advisory
