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CVE-2021-33909

HIGHCVSS 7.8/10EPSS 9.81%

Last modified

CVE-2021-33909 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 9.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
9.81%

94.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel>= 3.12.43, < 3.13
LinuxLinux Kernel>= 3.16, < 4.4.276
LinuxLinux Kernel>= 4.5, < 4.9.276
LinuxLinux Kernel>= 4.10, < 4.14.240
LinuxLinux Kernel>= 4.15, < 4.19.198
LinuxLinux Kernel>= 4.20, < 5.4.134
LinuxLinux Kernel>= 5.5, < 5.10.52
LinuxLinux Kernel>= 5.11, < 5.12.19
LinuxLinux Kernel>= 5.13, < 5.13.4
FedoraprojectFedora34
DebianDebian Linux9.0
DebianDebian Linux10.0
NetappHci Management NodeAll versions
NetappSolidfireAll versions
OracleCommunications Session Border Controller8.2
OracleCommunications Session Border Controller8.3
OracleCommunications Session Border Controller8.4
OracleCommunications Session Border Controller9.0
SonicwallSma1000 Firmware<= 12.4.2-02044

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-33909?
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.
How severe is CVE-2021-33909?
CVE-2021-33909 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 9.81% probability of exploitation in the next 30 days.
How do I fix CVE-2021-33909?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33909?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST