CVE-2021-0605

kernel: In pfkey_dump() dplen and splen can both be specified to access the xfrm_address_t structure out of bounds

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Severity

Moderate

Red Hat Product Security

4.4

CVSS 3.1

Review impact separately from score.

Published · June 22, 2021

Updated · June 28, 2026

Description

A flaw was found in the way the Linux kernel's pfkey_dump function trusted the provided filter size parameters. A local, sufficiently privileged user could use this flaw to leak information from the kernel.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

If the CAP_NET_ADMIN capability is privileged by default (which is true for Red Hat Enterprise Linux 7), then only an otherwise privileged user can trigger this bug.

On Red Hat Enterprise Linux 8 CAP_NET_ADMIN capability can be also gained by exploiting unprivileged user namespaces. The mitigation is to disable unprivileged user namespaces by setting user.max_user_namespaces to 0:

echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf

sysctl -p /etc/sysctl.d/userns.conf

CVSS / CWE

CVSS 3.1 · 4.4
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer