CVE-2020-29534 — Incorrect Privilege Assignment in Kernel

CWE-266 — Incorrect Privilege Assignment8 documents7 sources
Severity
7.8HIGHNVD
OSV5.5
EPSS
0.0%
top 87.93%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Linux KernelDebian LinuxMsrc CM1 Kernel 5.4.91-1 ON CBL Mariner 1.0
Timeline
PublishedDec 3
Latest updateMay 24

Description

An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages4 packages

▶NVDlinux/linux_kernel5.1 — 5.8.18+2
▶Debianlinux/linux_kernel< 5.9.6-1+3
▶debiandebian/linux< linux 5.9.6-1 (bookworm)

Patches

Patch: bugs.chromium.org ↗Patch: cdn.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

3
GHSA
GHSA-6pj8-q9pf-wvp7: An issue was discovered in the Linux kernel before 5↗2022-05-24
▶
OSV
linux, linux-hwe-5.8, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle, linux-raspi vulnerabilities↗2021-01-06
▶
OSV
CVE-2020-29534: An issue was discovered in the Linux kernel before 5↗2020-12-03
▶

📋Vendor Advisories

4
Ubuntu
Linux kernel vulnerabilities↗2021-01-06
▶
Microsoft
An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request causing execve() to incorrectly optimize↗2020-12-08
▶
Red Hat
kernel: io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd() allowing for privileges escalation↗2020-12-03
▶
Debian
CVE-2020-29534: linux - An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-r...↗2020
▶