CVE-2020-28941 — Release of Invalid Pointer or Reference in Linux

CWE-763 — Release of Invalid Pointer or ReferenceCWE-476 — NULL Pointer Dereference12 documents7 sources
Severity
5.5MEDIUMNVD
OSV7.8OSV4.1
EPSS
0.1%
top 80.78%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Linux KernelDebian LinuxDebian Linux+2 more
Timeline
PublishedNov 19
Latest updateMay 24

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 vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages5 packages

▶Debianlinux/linux_kernel< 5.9.11-1+3
▶Ubuntulinux/linux_kernel< 4.15.0-136.140+1
▶debiandebian/linux< linux 5.9.11-1 (bookworm)

Also affects: Debian Linux 9.0, Fedora 32, 33

Patches

Patch: www.openwall.com ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

5
GHSA
GHSA-5pqg-qmmw-g6j5: An issue was discovered in drivers/accessibility/speakup/spk_ttyio↗2022-05-24
▶
OSV
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities↗2021-02-25
▶
OSV
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabil↗2021-02-25
▶
OSV
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-ra↗2021-02-25
▶
OSV
CVE-2020-28941: An issue was discovered in drivers/accessibility/speakup/spk_ttyio↗2020-11-19
▶

📋Vendor Advisories

6
Ubuntu
Linux kernel vulnerabilities↗2021-02-25
▶
Ubuntu
Linux kernel vulnerabilities↗2021-02-25
▶
Ubuntu
Linux kernel vulnerabilities↗2021-02-25
▶
Red Hat
kernel: NULL pointer dereference in spk_ttyio_ldisc_close function in drivers/accessibility/speakup/spk_ttyio.c↗2020-11-19
▶
Microsoft
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 ↗2020-11-10
▶