CVE-2021-21781

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

CVSS v3.1

3.3 LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.0

4.0 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v2.0

2.1 LOWAV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS

0.50% chance of exploitation in the next 30 days, 41th percentile

Published

2021-08-18

Updated

2024-08-03

Proof-of-concept exploits (1)

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243

References

• CVE Record
• NVD entry

Related

• CVE-2021-21779
• CVE-2021-21782
• CVE-2021-21778
• CVE-2021-21783
• CVE-2021-21777
• CVE-2021-21784