VDB
CVE-2021-34981
CVE-2021-34981
PUBLISHED
CVSS 7.5 HIGH
Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11977.
EPSS 0.20% · 9.7th percentile
Risk Scores
CVSS 3.0
7.5
CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score
0.20%
9.7th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:16.04:LTS | linux | 4.4.0-277.311, 0, 4.3.0-1.10 |
| Ubuntu:20.04:LTS | linux-intel-5.13 | 5.13.0-1008.8, 5.13.0-1007.7, 5.13.0-1017.19 |
| Ubuntu:Pro:20.04:LTS | linux-azure-fde-5.15 | *, *, * |
| Ubuntu:Pro:16.04:LTS | linux-oracle | 0, *, * |
| Ubuntu:18.04:LTS | linux-azure-5.3 | 5.3.0-1020.21~18.04.1, 5.3.0-1007.8~18.04.1, 5.3.0-1009.10~18.04.1 |
| Ubuntu:18.04:LTS | linux-gcp-5.3 | *, 5.3.0-1032.34~18.04.1, 5.3.0-1030.32~18.04.1 |
| Ubuntu:Pro:20.04:LTS | linux-aws | 5.4.0-1152.162, 5.4.0-1150.160, 5.4.0-1149.159 |
| Ubuntu:Pro:16.04:LTS | linux-azure | *, *, 4.15.0-1069.74 |
| Ubuntu:Pro:FIPS-updates:18.04:LTS | linux-azure-fips | 4.15.0-2073.79, 4.15.0-2072.78, 4.15.0-2071.77 |
| Ubuntu:Pro:18.04:LTS | linux-oracle | 4.15.0-1085.93, 0, 4.15.0-1007.9 |
| Ubuntu:Pro:20.04:LTS | linux-iot | 5.4.0-1054.57, 5.4.0-1056.59, 5.4.0-1057.60 |
| Ubuntu:20.04:LTS | linux-gkeop | 5.4.0-1097.101, 5.4.0-1096.100, 5.4.0-1095.99 |
| Ubuntu:18.04:LTS | linux-oracle-5.0 | 5.0.0-1013.18, *, 0 |
| Ubuntu:Pro:20.04:LTS | linux-xilinx-zynqmp | 5.4.0-1045.49, 5.4.0-1044.48, 5.4.0-1043.47 |
| Ubuntu:20.04:LTS | linux-raspi2 | 5.3.0-1015.17, 5.3.0-1017.19, 5.4.0-1004.4 |
| Ubuntu:Pro:18.04:LTS | linux-aws-5.4 | 5.4.0-1075.80~18.04.1, *, * |
| Ubuntu:Pro:18.04:LTS | linux-azure-4.15 | 4.15.0-1187.202, 4.15.0-1185.200, 4.15.0-1183.198 |
| Ubuntu:20.04:LTS | linux-oracle-5.8 | 5.8.0-1033.34~20.04.1, 5.8.0-1034.35~20.04.2, 5.8.0-1037.38~20.04.1 |
| Ubuntu:Pro:18.04:LTS | linux-ibm-5.4 | 5.4.0-1034.38~18.04.1, 5.4.0-1036.41~18.04.1, 5.4.0-1037.42~18.04.1 |
| Ubuntu:Pro:20.04:LTS | linux-oracle | 5.4.0-1119.128, 5.4.0-1008.8, 5.4.0-1151.161 |
…and 74 more
Timeline
- Nov 24, 2021 CVE Published
- May 8, 2024 EPSS Score
- Jun 2, 2024 EPSS Score
- Jun 27, 2024 EPSS Score
- Jul 22, 2024 EPSS Score
- Aug 15, 2024 EPSS Score
- Sep 9, 2024 EPSS Score
- Oct 3, 2024 EPSS Score
- Oct 28, 2024 EPSS Score
- Nov 21, 2024 EPSS Score
- Dec 17, 2024 EPSS Score
- Jan 11, 2025 EPSS Score
References
- https://www.zerodayinitiative.com/advisories/ZDI-21-1223/ third-party-advisory
- https://git.kernel.org/linus/3cfdf8fcaafa62a4123f92eb0f4a72650da3a479 third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-34981 third-party-advisory
- https://ubuntu.com/security/CVE-2021-34981 advisory