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Status published
High
CVE-2021-33909
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4...
Vulnerability Description
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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html
- https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html
- https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html
- https://www.debian.org/security/2021/dsa-4941
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/
- http://www.openwall.com/lists/oss-security/2021/07/22/7
- http://www.openwall.com/lists/oss-security/2021/08/25/10
- http://www.openwall.com/lists/oss-security/2021/09/17/2
- http://www.openwall.com/lists/oss-security/2021/09/17/4
- http://www.openwall.com/lists/oss-security/2021/09/21/1
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.openwall.com/lists/oss-security/2021/07/20/1
- https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
- http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html
- http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html
- https://security.netapp.com/advisory/ntap-20210819-0004/
- http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html
- http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015
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Affected Vendor
linux
View all reports →Affected Software
linux kernel, fedora, debian linux, hci management node, solidfire, communications session border controller, sma1000 firmware
Vulnerable Versions:
3.12.43, 3.16, 4.5, 4.10, 4.15, 4.20, 5.5, 5.11, 5.13, 34, 9.0, 10.0, 8.2, 8.3, 8.4, 0
Timeline
Official Publish:
July 20th, 2021
Last Modified:
August 4th, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.