CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
21.6%
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).
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 20.10 | noarch | linux | < 5.8.0-53.60 | UNKNOWN |
ubuntu | 21.04 | noarch | linux | < 5.11.0-17.18 | UNKNOWN |
ubuntu | 20.10 | noarch | linux-aws | < 5.8.0-1033.35 | UNKNOWN |
ubuntu | 21.04 | noarch | linux-aws | < 5.11.0-1007.7 | UNKNOWN |
ubuntu | 20.10 | noarch | linux-azure | < 5.8.0-1032.34 | UNKNOWN |
ubuntu | 21.04 | noarch | linux-azure | < 5.11.0-1005.5 | UNKNOWN |
ubuntu | 20.10 | noarch | linux-gcp | < 5.8.0-1031.32 | UNKNOWN |
ubuntu | 21.04 | noarch | linux-gcp | < 5.11.0-1007.7 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-hwe-5.8 | < 5.8.0-53.60~20.04.1 | UNKNOWN |
ubuntu | 20.10 | noarch | linux-kvm | < 5.8.0-1027.29 | UNKNOWN |
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db
launchpad.net/bugs/cve/CVE-2021-3491
nvd.nist.gov/vuln/detail/CVE-2021-3491
security-tracker.debian.org/tracker/CVE-2021-3491
ubuntu.com/security/notices/USN-4948-1
ubuntu.com/security/notices/USN-4949-1
ubuntu.com/security/notices/USN-4950-1
www.cve.org/CVERecord?id=CVE-2021-3491
www.openwall.com/lists/oss-security/2021/05/11/13
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
21.6%