Vulnerability in Linux Kernel
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
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Linux Kernel — versions 5.4.54, 5.4.66
- Oracle Communications Cloud Native Core Binding Support Function — versions 22.1.3
- Oracle Communications Cloud Native Core Network Exposure Function — versions 22.1.1
- Oracle Communications Cloud Native Core Policy — versions 22.2.0
- Linux Kernel — versions Linux Kernel v5.4.54, Linux Kernel v5.4.66
Weakness classification (CWE)
References
- talosintelligence.com/vulnerability_reports/TALOS-2021-1243 (Exploit, Third Party Advisory)
- www.oracle.com/security-alerts/cpujul2022.html (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21781?
- CVE-2021-21781 is a low-severity vulnerability in Linux Kernel, classified under Use of Uninitialized Resource. CVSS score: 3.3/10. Published 2021-08-18.
- How severe is CVE-2021-21781?
- Low severity. CVSS v3 base score is 3.3 out of 10.