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Mend.io Vulnerability Database

CVE-2021-33909

Date: July 20, 2021

fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.

Severity Score

7.8

Related Resources (26)

Url: https://www.openwall.com/lists/oss-security/2021/07/20/1

Url: https://www.debian.org/security/2021/dsa-4941

Url: http://www.openwall.com/lists/oss-security/2021/09/21/1

Url: https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html

Url: https://access.redhat.com/security/cve/CVE-2021-33909

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/

Url: https://www.oracle.com/security-alerts/cpujan2022.html

Url: https://security.netapp.com/advisory/ntap-20210819-0004/

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-33909

Url: https://security-tracker.debian.org/tracker/CVE-2021-33909

Url: https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015

Url: https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html

Url: http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html

Url: https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/

Url: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4

Url: https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html

Url: http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html

Url: http://www.openwall.com/lists/oss-security/2021/07/22/7

Url: http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html

Url: http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33909

Url: http://www.openwall.com/lists/oss-security/2021/08/25/10

Url: http://www.openwall.com/lists/oss-security/2021/09/17/4

Url: http://www.openwall.com/lists/oss-security/2021/09/17/2

Url: https://www.mend.io/vulnerability-database/CVE-2021-33909

Severity Score

7.8

Weakness Type (CWE)

Integer Overflow or Wraparound

CWE-190

Out-of-bounds Write

CWE-787

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-120

CVSS v3.1

Base Score:	7.8
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

CVSS v2

Base Score:	7.2
Access Vector (AV):	LOCAL
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	COMPLETE
Integrity (I):	COMPLETE
Availability (A):	COMPLETE
Additional information:

Mend.io Vulnerability Database

We found results for “”

CVE-2021-33909

Date: July 20, 2021

Severity Score

Related Resources (26)

Severity Score

Weakness Type (CWE)

CVSS v3.1

CVSS v2

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