CVE-2022-2639

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-09-01 · updated 2026-06-17
Weakness: CWE-192

Description

An integer coercion error was found in the openvswitch kernel module. Given a sufficiently large number of actions, while copying and reserving memory for a new action of a new flow, the reserve_sfa_size() function does not return -EMSGSIZE as expected, potentially leading to an out-of-bounds write access. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Affected products

Linux kernel: from 3.18.139 before 3.19; from 4.4.179 before 4.5; from 4.9.169 before 4.9.312; from 4.14.112 before 4.14.277; from 4.19.35 before 4.19.240; from 5.0.8 before 5.4.191 — fixed in 3.19, 4.14.277, 4.19.240, 4.5, 4.9.312, 5.10.113
Red Hat Enterprise Linux: 8.0, 9.0

How to fix

Upgrade to a fixed version: Linux kernel 3.19, 4.14.277, 4.19.240, 4.5. Check the vendor advisory for mitigations.

References

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