CVE-2021-47442: NFC: digital: fix possible memory leak in digital_in_send_sdd_req()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-22 · updated 2026-06-17
Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: NFC: digital: fix possible memory leak in digital_in_send_sdd_req() 'skb' is allocated in digital_in_send_sdd_req(), but not free when digital_in_send_cmd() failed, which will cause memory leak. Fix it by freeing 'skb' if digital_in_send_cmd() return failed.

Affected products

Linux kernel: from 3.13 before 4.4.290; from 4.5 before 4.9.288; from 4.10 before 4.14.252; from 4.15 before 4.19.213; from 4.20 before 5.4.155; from 5.5 before 5.10.75 — fixed in 4.14.252, 4.19.213, 4.4.290, 4.9.288, 5.10.75, 5.14.14

How to fix

Upgrade to a fixed version: Linux kernel 4.14.252, 4.19.213, 4.4.290, 4.9.288. Check the vendor advisory for mitigations.

References

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