01 Record

CVE-2020-28941

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,

MediumPUBLISHEDCNA: mitre

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 26.2% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2020-11-19 15:23Z5 YR AGO

Last updated

2026-05-29 16:06Z3 MO AGO

Reserved

2020-11-19

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-763Release of Invalid Pointer or ReferenceBase
CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

e84f99d34418fc7b1c27112712fc34ab776e3dd00feb940f0c772d912bc05bd2

05 Affected products

VendorProductVersionsPlatforms

debiandebian_linuxNot specified—

fedoraprojectfedoraNot specified—

linuxlinux_kernelNot specified—

redhatenterprise_linuxNot specified—

redhatenterprise_mrgNot specified—

06 References

git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-linus&id=d4122754442799187d5d537a9c039a49a67e57f1x_refsource_MISC
www.openwall.comhttps://www.openwall.com/lists/oss-security/2020/11/19/3x_refsource_MISC
github.comhttps://github.com/torvalds/linux/commit/d4122754442799187d5d537a9c039a49a67e57f1x_refsource_MISC
git.kernel.orghttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d4122754442799187d5d537a9c039a49a67e57f1x_refsource_MISC
www.openwall.com[oss-security] 20201119 Re: Linux kernel NULL-ptr deref bug in spk_ttyio_ldisc_closehttp://www.openwall.com/lists/oss-security/2020/11/19/5mailing-listx_refsource_MLIST
lists.fedoraproject.orgFEDORA-2020-4700a73bd5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2020-8c15928d23https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/vendor-advisoryx_refsource_FEDORA
lists.debian.org[debian-lts-announce] 20201210 [SECURITY] [DLA 2483-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlmailing-listx_refsource_MLIST

01 Record index

CVE-2020-28941

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2020-28941

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References