In the Linux kernel, the following vulnerability has been resolved:
xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + "unregister_netdevice: waiting for <dev> to become free").
Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error.
ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-tools-debuginfoUpgrade bpftool6.12Upgrade bpftool6.18Upgrade python3-perf6.18Upgrade kernel6.12-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.12-toolsUpgrade kernel-livepatch-6.18.44-99.149Upgrade perf6.12Upgrade kernel-livepatch-6.12.103-127.188Upgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade bpftool6.18-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-modules-extraUpgrade kernel6.18-debuginfoUpgrade kernel6.18-tools-develUpgrade microvm-kernel6.18Upgrade kernel6.12-tools-develUpgrade perf6.18Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-headersUpgrade kernel6.12Upgrade python3-perf6.12Upgrade kernel6.18Upgrade kernel6.18-modules-extra-commonUpgrade perf6.12-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.12-develUpgrade bpftool6.12-debuginfoUpgrade kernel6.18-develUpgrade kernel6.18-tools | Sep 1, 2026 | Aug 5, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Aug 9, 2026 | Aug 9, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-generic-64kUpgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-azure-fipsUpgrade linux-image-azure-fde-6.8Upgrade linux-image-fips-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-6.8.0-1067-awsUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-6.8.0-1066-gkeUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-6.8.0-1066-gke-64kUpgrade linux-image-6.8.0-1071-gcp-64kUpgrade linux-image-aws-64kUpgrade linux-image-6.8.0-147-lowlatency-64kUpgrade linux-image-oem-7.0Upgrade linux-image-6.8.0-147-generic-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-7.0.0-1017-azureUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-intel-iotgUpgrade linux-image-oracle-7.0Upgrade linux-image-lowlatencyUpgrade linux-image-generic-6.8Upgrade linux-image-gkeUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-gcp-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-nvidia-tegraUpgrade linux-image-gcp-7.0Upgrade linux-image-ibm-classicUpgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-gkeop-6.8Upgrade linux-image-oracleUpgrade linux-image-azure-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1052-gkeopUpgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1071-azure-fipsUpgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-6.8.0-1067-aws-64kUpgrade linux-image-aws-fips-6.8Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-oracle-64kUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-gke-6.8Upgrade linux-image-ibmUpgrade linux-image-azure-lts-26.04Upgrade linux-image-6.8.0-1071-azureUpgrade linux-image-realtimeUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-azure-fips-6.8Upgrade linux-image-kvmUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcpUpgrade linux-image-gkeopUpgrade linux-image-7.0.0-38-genericUpgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-virtualUpgrade linux-image-6.8.0-1064-oracle-64kUpgrade linux-image-azure-7.0Upgrade linux-image-azure-fde-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-6.8.0-1064-oracleUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-6.8.0-1036-nvidia-tegraUpgrade linux-image-realtime-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-realtime-6.8.1Upgrade linux-image-fipsUpgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-gke-64kUpgrade linux-image-6.8.0-147-lowlatencyUpgrade linux-image-6.8.0-147-genericUpgrade linux-image-gke-7.0Upgrade linux-image-generic-64k-6.8Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-aws-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-awsUpgrade linux-image-6.8.0-1067-ibmUpgrade linux-image-gke-64k-7.0Upgrade linux-image-gke-64k-6.8Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1067-aws-fipsUpgrade linux-image-lowlatency-64kUpgrade linux-image-generic-7.0Upgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-virtual-6.8Upgrade linux-image-6.8.1-1062-realtimeUpgrade linux-image-6.8.0-1036-nvidia-tegra-rtUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-6.8.0-1071-gcp-fipsUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-azure-fdeUpgrade linux-image-azureUpgrade linux-image-oracle-6.8Upgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-aws-7.0Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-laptop-23.10Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-genericUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-aws-fipsUpgrade linux-image-aws-64k-7.0Upgrade linux-image-6.8.0-1069-azure-fdeUpgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-1014-awsUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-6.8.0-147-fipsUpgrade linux-image-6.8.0-1071-gcpUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-lpaeUpgrade linux-image-7.0.0-1013-oracle | Oct 7, 2026 | Oct 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 14, 2026 | Aug 5, 2026 |
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