CVE-2020-28941: debian debian_linux Release of Invalid Pointer or Reference
Vulnerability summary
CVE-2020-28941 is a medium (CVSS 5.5) Release of Invalid Pointer or Reference vulnerability in debian debian_linux. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 26.4% 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 12 · Related 9Timeline
- 19-11-2020PublishedVulnerability first disclosed.
- 29-05-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
CVSS metrics
5 scores · 4 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
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
26%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.33% 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.
Ubuntu46 products
- linux< 4.15.0-136.140 | < 5.4.0-66.74
- linux-aws< 4.15.0-1094.101 | < 5.4.0-1038.40
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1038.40~18.04.1
Debian2 products
- linux< 5.9.11-1
- debian_linuxEOL9.0
Fedoraproject1 product
- fedoraEOL32 | 33
Linux1 product
- linux_kernel≤ 5.9.9
4 vendors · 50 products
References
15 links- www.openwall.com/lists/oss-security/2020/11/19/3X Refsource MISCREPORTMailing ListPatchThird Party Advisory
- github.com/torvalds/linux/commit/d4122754442799187d5d537a9c039a49a67e57f1X Refsource MISCREPORTPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2020/11/19/5Mailing ListX Refsource MLISTREPORTPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing ListX Refsource MLISTThird Party Advisory
