Vulnerability Details : CVE-2021-33909
Potential exploit
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.
Vulnerability category: OverflowMemory Corruption
Products affected by CVE-2021-33909
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_session_border_controller:8.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_session_border_controller:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_session_border_controller:8.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_session_border_controller:8.2:*:*:*:*:*:*:*
- cpe:2.3:o:sonicwall:sma1000_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-33909
0.96%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 83 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-33909
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2021-33909
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by: nvd@nist.gov (Primary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-33909
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/
[SECURITY] Fedora 34 Update: kernel-5.13.4-200.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
Kernel Live Patch Security Notice LSN-0083-1 ≈ Packet StormThird Party Advisory;VDB Entry
-
http://www.openwall.com/lists/oss-security/2021/09/17/4
oss-security - Re: Containers-optimized OS (COS) membership in the linux-distros listMailing List;Third Party Advisory
-
https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b
seq_file: disallow extremely large seq buffer allocations · torvalds/linux@8cae8cd · GitHubPatch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html
[SECURITY] [DLA 2713-1] linux security updateMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2021/09/21/1
oss-security - Re: Containers-optimized OS (COS) membership in the linux-distros listMailing List;Third Party Advisory
-
https://www.oracle.com/security-alerts/cpujan2022.html
Oracle Critical Patch Update Advisory - January 2022Patch;Third Party Advisory
-
https://www.debian.org/security/2021/dsa-4941
Debian -- Security Information -- DSA-4941-1 linuxThird Party Advisory
-
http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html
Kernel Live Patch Security Notice LSN-0081-1 ≈ Packet StormThird Party Advisory;VDB Entry
-
http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html
Kernel Live Patch Security Notice LSN-0079-1 ≈ Packet StormThird Party Advisory;VDB Entry
-
http://www.openwall.com/lists/oss-security/2021/09/17/2
oss-security - Containers-optimized OS (COS) membership in the linux-distros listMailing List;Third Party Advisory
-
http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html
Sequoia: A Deep Root In Linux's Filesystem Layer ≈ Packet StormExploit;Third Party Advisory;VDB Entry
-
https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html
[SECURITY] [DLA 2714-1] linux-4.19 security updateMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2021/07/22/7
oss-security - Re: CVE-2021-33909: size_t-to-int vulnerability in Linux's filesystem layerMailing List;Third Party Advisory
-
https://www.openwall.com/lists/oss-security/2021/07/20/1
oss-security - CVE-2021-33909: size_t-to-int vulnerability in Linux's filesystem layerExploit;Mailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html
[SECURITY] [DLA 2713-2] linux security updateMailing List;Third Party Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
Mailing List;Patch;Vendor Advisory
-
https://security.netapp.com/advisory/ntap-20210819-0004/
CVE-2021-33909 Linux Kernel Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
-
http://www.openwall.com/lists/oss-security/2021/08/25/10
oss-security - Re: CVE-2021-33909: size_t-to-int vulnerability in Linux's filesystem layerMailing List;Third Party Advisory
-
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015
Security AdvisoryThird Party Advisory
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