What’s Vulnerable › Vulnerabilities

CVE-2022-47929

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-01-17 · updated 2026-10-14
• Weakness: CWE-476

Description

In the Linux kernel before 6.1.6, a NULL pointer dereference bug in the traffic control subsystem allows an unprivileged user to trigger a denial of service (system crash) via a crafted traffic control configuration that is set up with "tc qdisc" and "tc class" commands. This affects qdisc_graft in net/sched/sch_api.c.

Affected products

• Debian Linux: 11.0
• Linux kernel: before 6.1.6 — fixed in 6.1.6

How to fix

Upgrade to a fixed version: Linux kernel 6.1.6. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407
• https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html
• https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
• https://tldp.org/HOWTO/Traffic-Control-HOWTO/components.html
• https://www.debian.org/security/2023/dsa-5324
• https://www.spinics.net/lists/netdev/msg555705.html
• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96398560f26aa07e8f2969d73c8197e6a6d10407
• https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html
• https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
• https://tldp.org/HOWTO/Traffic-Control-HOWTO/components.html

Get alerted when CVE-2022-47929 or the next vulnerability affects your stack