Description
In the Linux kernel, the following vulnerability has been resolved: nbd: don't allow reconnect after disconnect Following process can cause nbd_config UAF: 1) grab nbd_config temporarily; 2) nbd_genl_disconnect() flush all recv_work() and release the initial reference: nbd_genl_disconnect nbd_disconnect_and_put nbd_disconnect flush_workqueue(nbd->recv_workq) if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF, ...)) nbd_config_put -> due to step 1), reference is still not zero 3) nbd_genl_reconfigure() queue recv_work() again; nbd_genl_reconfigure config = nbd_get_config_unlocked(nbd) if (!config) -> succeed if (!test_bit(NBD_RT_BOUND, ...)) -> succeed nbd_reconnect_socket queue_work(nbd->recv_workq, &args->work) 4) step 1) release the reference; 5) Finially, recv_work() will trigger UAF: recv_work nbd_config_put(nbd) -> nbd_config is freed atomic_dec(&config->recv_threads) -> UAF Fix the problem by clearing NBD_RT_BOUND in nbd_genl_disconnect(), so that nbd_genl_reconfigure() will fail.
Details
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 6.8.0-64.67 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 6.8.0-1032.34 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1084.91~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1146.156~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-6.8 | — | 6.8.0-1032.34~22.04.1 |
| linux-aws-fips | — | 5.15.0-1084.91+fips1 |
| linux-aws-hwe | — | — |
| linux-azure | — | 6.8.0-1034.39 |
| linux-azure-4.15 | — | — |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1089.98~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1151.158~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.11 | — | 6.11.0-1015.15~24.04.1 |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | — |
| linux-azure-6.8 | — | 6.8.0-1034.39~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fips | — | 5.15.0-1089.98+fips1 |
| linux-azure-nvidia | — | 6.8.0-1022.23 |
| linux-bluefield | — | — |
| linux-fips | — | 6.8.0-78.78+fips1 |
| linux-gcp | — | 6.8.0-1033.35 |
| linux-gcp-4.15 | — | — |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1083.92~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1149.158~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.11 | — | 6.11.0-1015.15~24.04.1 |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | — |
| linux-gcp-6.8 | — | 6.8.0-1033.35~22.04.1 |
| linux-gcp-fips | — | 5.15.0-1083.92+fips1 |
| linux-gke | — | 6.8.0-1028.32 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 6.8.0-1015.17 |
| linux-gkeop-5.15 | — | — |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-142.152~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-216.236~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.11 | — | 6.11.0-26.26~24.04.1 |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | — |
| linux-hwe-6.8 | — | 6.8.0-64.67~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 6.8.0-1029.29 |
| linux-ibm-5.15 | — | 5.15.0-1076.79~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1092.97~18.04.1 |
| linux-ibm-6.8 | — | 6.8.0-1029.29~22.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1077.79 |
| linux-intel-iotg | — | 5.15.0-1079.85 |
| linux-intel-iotg-5.15 | — | 5.15.0-1079.85~20.04.1 |
| linux-iot | — | 5.4.0-1051.54 |
| linux-kvm | — | 5.15.0-1080.85 |
| linux-lowlatency | — | 6.8.0-64.67.1 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-140.150~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.11 | — | 6.11.0-1014.15~24.04.1 |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | — |
| linux-lowlatency-hwe-6.8 | — | 6.8.0-64.67.1~22.04.1 |
| linux-nvidia | — | 6.8.0-1031.34 |
| linux-nvidia-6.11 | — | 6.11.0-1010.10 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | — |
| linux-nvidia-6.8 | — | 6.8.0-1031.34~22.04.1 |
| linux-nvidia-lowlatency | — | 6.8.0-1031.34.1 |
| linux-nvidia-tegra | — | 6.8.0-1008.8 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1039.39~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1026.26 |
| linux-oem | — | — |
| linux-oem-5.10 | — | — |
| linux-oem-5.13 | — | — |
| linux-oem-5.14 | — | — |
| linux-oem-5.17 | — | — |
| linux-oem-5.6 | — | — |
| linux-oem-6.0 | — | — |
| linux-oem-6.1 | — | — |
| linux-oem-6.11 | — | 6.11.0-1022.22 |
| linux-oem-6.5 | — | — |
| linux-oem-6.8 | — | 6.8.0-1031.31 |
| linux-oracle | — | 6.8.0-1029.30 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1081.87~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1144.154~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | — |
| linux-oracle-6.8 | — | 6.8.0-1029.30~22.04.1 |
| linux-raspi | — | 6.8.0-1031.35 |
| linux-raspi-5.4 | — | 5.4.0-1129.142~18.04.1 |
| linux-raspi-realtime | — | 6.8.0-2026.27 |
| linux-raspi2 | — | — |
| linux-realtime | — | 6.8.1-1025.26 |
| linux-realtime-6.8 | — | 6.8.1-1025.26~22.04.1 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1079.83~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.5 | — | — |
| linux-riscv-6.8 | — | 6.8.0-64.67~22.04.1 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | — |
| linux-xilinx | — | 6.8.0-1017.18 |
| linux-xilinx-zynqmp | — | 5.15.0-1050.54 |
References
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