CVE-2021-47014
kernel: net/sched: act_ct: fix wild memory access when clearing fragments
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · February 28, 2024
Updated · September 24, 2026
Description
A flaw was found in the act_ct component of the Linux kernel's networking scheduler. When act_ct temporarily stores an IP fragment, restoring the skb qdisc cb can lead to random data being placed in FRAG_CB(). This results in wild memory accesses when the rbtree is purged, which may cause a system crash, leading to a Denial of Service (DoS).
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
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer