CVE-2021-41073 — Release of Invalid Pointer or Reference in Kernel

CWE-763 — Release of Invalid Pointer or ReferenceCWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-269 — Improper Privilege Management15 documents7 sources
Severity
7.8HIGHNVD
OSV6.5OSV5.5OSV4.7
EPSS
1.6%
top 18.13%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
6
Linux KernelDebian LinuxDebian Linux+3 more
Timeline
PublishedSep 19
Latest updateMay 24

Description

loop_rw_iter in fs/io_uring.c in the Linux kernel 5.10 through 5.14.6 allows local users to gain privileges by using IORING_OP_PROVIDE_BUFFERS to trigger a free of a kernel buffer, as demonstrated by using /proc//maps for exploitation.

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 Packages5 packages

▶NVDlinux/linux_kernel5.10 — 5.10.68+1
▶Debianlinux/linux_kernel< 5.10.46-5+3
▶debiandebian/linux< linux 5.14.6-2 (bookworm)

Also affects: Debian Linux 10.0, Fedora 33, 34

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

7
GHSA
GHSA-5cqf-vv6j-6f4g: loop_rw_iter in fs/io_uring↗2022-05-24
▶
OSV
linux-azure, linux-azure-5.11 regression↗2021-10-18
▶
OSV
linux-oem-5.10 vulnerabilities↗2021-10-06
▶
OSV
linux-hwe-5.11, linux-azure, linux-azure-5.11, linux-oracle-5.11 vulnerabilities↗2021-09-29
▶
OSV
linux-oem-5.13 vulnerabilities↗2021-09-29
▶

📋Vendor Advisories

7
Ubuntu
Linux kernel (Azure) regression↗2021-10-18
▶
Ubuntu
Linux kernel (OEM) vulnerabilities↗2021-10-06
▶
Ubuntu
Linux kernel vulnerabilities↗2021-09-29
▶
Ubuntu
Linux kernel (OEM) vulnerabilities↗2021-09-29
▶
Red Hat
kernel: local user privilege escalation via loop_rw_iter in fs/io_uring.c↗2021-09-19
▶
CVE-2021-41073 — Linux Kernel vulnerability | cvebase