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CVE-2021-3491

CVSS v3.1 8.8 (High)
88% Progress
CVSS v2.0 7.2 (High)
72% Progress
EPSS 0.05 % (22th)
0.05% Progress
Affected Products 2
Advisories 21
Info CVSS EPSS CAPEC Affected Configurations References Security Advisories Packages & Software OVAL Tools, Exploits & PoC Graph Web & Social Timeline

The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).

Weaknesses
CWE-131
Incorrect Calculation of Buffer Size
CWE-787
Out-of-bounds Write
CVE Status
PUBLISHED
CNA
Canonical Ltd.
Published Date
2021-06-04 02:15:07
(3 years ago)
Updated Date
2021-09-14 14:31:37
(3 years ago)

Affected Products

Canonical

Linux

Configuration #1

    CPE23 From Up To
  Linux Kernel from 5.7 version and prior 5.10.37 version cpe:2.3:o:linux:linux_kernel >= 5.7 < 5.10.37
  Linux Kernel from 5.11 version and prior 5.11.21 version cpe:2.3:o:linux:linux_kernel >= 5.11 < 5.11.21
  Linux Kernel from 5.12 version and prior 5.12.4 version cpe:2.3:o:linux:linux_kernel >= 5.12 < 5.12.4

Configuration #2

    CPE23 From Up To
  Canonical Ubuntu Linux 20.04 cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts
  Canonical Ubuntu Linux 20.10 cpe:2.3:o:canonical:ubuntu_linux:20.10
  Canonical Ubuntu Linux 21.04 cpe:2.3:o:canonical:ubuntu_linux:21.04