NULL Pointer Dereference Affecting kernel-livepatch-6.12.46-66.121 package, versions <1:1.0-0.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.03% (8th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIVEPATCH6124666121-13167159
  • published1 Oct 2025
  • disclosed16 Apr 2025

Introduced: 16 Apr 2025

CVE-2025-22103  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-livepatch-6.12.46-66.121 to version 1:1.0-0.amzn2023 or higher.
This issue was patched in ALAS2023-2025-1208.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-6.12.46-66.121 package and not the kernel-livepatch-6.12.46-66.121 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

net: fix NULL pointer dereference in l3mdev_l3_rcv

When delete l3s ipvlan:

ip link del link eth0 ipvlan1 type ipvlan mode l3s

This may cause a null pointer dereference:

Call trace:
 ip_rcv_finish+0x48/0xd0
 ip_rcv+0x5c/0x100
 __netif_receive_skb_one_core+0x64/0xb0
 __netif_receive_skb+0x20/0x80
 process_backlog+0xb4/0x204
 napi_poll+0xe8/0x294
 net_rx_action+0xd8/0x22c
 __do_softirq+0x12c/0x354

This is because l3mdev_l3_rcv() visit dev->l3mdev_ops after ipvlan_l3s_unregister() assign the dev->l3mdev_ops to NULL. The process like this:

(CPU1)                     | (CPU2)
l3mdev_l3_rcv()            |
  check dev-&gt;priv_flags:   |
    master = skb-&gt;dev;     |
                           |
                           | ipvlan_l3s_unregister()
                           |   set dev-&gt;priv_flags
                           |   dev-&gt;l3mdev_ops = NULL;
                           |
  visit master-&gt;l3mdev_ops |

To avoid this by do not set dev->l3mdev_ops when unregister l3s ipvlan.

CVSS Base Scores

version 3.1