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Vulnerability record · CVE-2021-42008 · published 5 October 2021

CVE-2021-42008: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.

7.8 CVSS 3.1 High EPSS 1.6% · top 25.8% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 6.9
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.

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

Affected products

11 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.13 Release NotesVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19d1532a187669ce86d5a2696eb7275310070793 PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0002/ Third Party Advisory
https://www.youtube.com/watch?v=d5f9xLK8Vhw ExploitThird Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.13 Release NotesVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19d1532a187669ce86d5a2696eb7275310070793 PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0002/ Third Party Advisory
https://www.youtube.com/watch?v=d5f9xLK8Vhw ExploitThird Party Advisory

Track CVE-2021-42008 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Source: NIST National Vulnerability Database (record CVE-2021-42008), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.