VDB
CVE-2021-21781
CVE-2021-21781
PUBLISHED
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
EPSS 0.02% · 4.0th percentile
Risk Scores
EPSS Score
0.02%
4.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:18.04:LTS | linux-aws | 4.15.0-1027.27, 4.15.0-1021.21, 4.15.0-1087.92 |
| Ubuntu:Pro:16.04:LTS | linux-kvm | 4.4.0-1013.18, 4.4.0-1130.140, 4.4.0-1146.157 |
| Ubuntu:20.04:LTS | linux-kvm | 5.4.0-1033.34, 5.4.0-1034.35, 5.4.0-1036.37 |
| Ubuntu:20.04:LTS | linux-riscv-5.8 | 5.8.0-14.16~20.04.3, 5.8.0-17.19~20.04.1, 5.8.0-18.20~20.04.1 |
| Ubuntu:Pro:FIPS-updates:18.04:LTS | linux-aws-fips | 4.15.0-2026.26, 4.15.0-2027.27, 0 |
| Ubuntu:18.04:LTS | linux-oracle-5.0 | 5.0.0-1010.15~18.04.1, 5.0.0-1014.19, 0 |
| Ubuntu:18.04:LTS | linux-hwe-edge | *, 5.3.0-23.25~18.04.1, 5.0.0-20.21~18.04.1 |
| Ubuntu:18.04:LTS | linux-gkeop-5.4 | 5.4.0-1005.6, 5.4.0-1007.8~18.04.1, 5.4.0-1009.10~18.04.1 |
| Ubuntu:20.04:LTS | linux-aws | 5.4.0-1009.9, 0, 5.3.0-1003.3 |
| Ubuntu:Pro:16.04:LTS | linux-hwe | 4.15.0-36.39~16.04.1, *, * |
| Ubuntu:18.04:LTS | linux-aws-5.0 | 5.0.0-1027.30, 5.0.0-1025.28, 5.0.0-1024.27~18.04.1 |
| Ubuntu:18.04:LTS | linux | 4.15.0-22.24, 4.15.0-48.51, 4.15.0-47.50 |
| Ubuntu:18.04:LTS | linux-gcp-4.15 | 4.15.0-1094.107, 4.15.0-1095.108, 4.15.0-1096.109 |
| Ubuntu:20.04:LTS | linux-gkeop | 5.4.0-1012.13, 5.4.0-1011.12, 5.4.0-1010.11 |
| Ubuntu:Pro:14.04:LTS | linux-azure | 4.15.0-1098.109~14.04.1, 4.15.0-1113.126~14.04.1, * |
| Ubuntu:18.04:LTS | linux-oracle-5.3 | 5.3.0-1024.26~18.04.1, *, * |
| Ubuntu:18.04:LTS | linux-oem | 4.15.0-1033.38, 4.15.0-1013.16, 4.15.0-1064.73 |
| Ubuntu:Pro:FIPS:18.04:LTS | linux-fips | 0, 4.15.0-1011.12 |
| Ubuntu:18.04:LTS | linux-oracle-5.4 | 5.4.0-1041.44~18.04.1, 5.4.0-1034.36~18.04.1, 5.4.0-1035.38~18.04.1 |
| Ubuntu:18.04:LTS | linux-raspi2 | 4.15.0-1078.83, 4.15.0-1076.81, 4.15.0-1079.84 |
…and 56 more
Timeline
- Aug 10, 2021 CVE Published
- Aug 19, 2021 EPSS Score
- Oct 16, 2021 EPSS Score
- Dec 14, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 10, 2022 EPSS Score
- Apr 10, 2022 EPSS Score
- Jun 7, 2022 EPSS Score
- Aug 5, 2022 EPSS Score
- Oct 3, 2022 EPSS Score
- Nov 30, 2022 EPSS Score
- Jan 28, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-21781 third-party-advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243 third-party-advisory
- https://git.kernel.org/linus/9c698bff66ab4914bb3d71da7dc6112519bde23e third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-21781 third-party-advisory