Description
In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix use after free in iucv_sock_close() iucv_sever_path() is called from process context and from bh context. iucv->path is used as indicator whether somebody else is taking care of severing the path (or it is already removed / never existed). This needs to be done with atomic compare and swap, otherwise there is a small window where iucv_sock_close() will try to work with a path that has already been severed and freed by iucv_callback_connrej() called by iucv_tasklet_fn(). Example: [452744.123844] Call Trace: [452744.123845] ([] 0x1e87f03880) [452744.123966] [] iucv_path_sever+0x96/0x138 [452744.124330] [] iucv_sever_path+0xc2/0xd0 [af_iucv] [452744.124336] [] iucv_sock_close+0xa6/0x310 [af_iucv] [452744.124341] [] iucv_sock_release+0x3c/0xd0 [af_iucv] [452744.124345] [] __sock_release+0x5e/0xe8 [452744.124815] [] sock_close+0x34/0x48 [452744.124820] [] __fput+0xba/0x268 [452744.124826] [] task_work_run+0xbc/0xf0 [452744.124832] [] do_notify_resume+0x88/0x90 [452744.124841] [] system_call+0xe2/0x2c8 [452744.125319] Last Breaking-Event-Address: [452744.125321] [] iucv_path_sever+0x90/0x138 [452744.125324] [452744.125325] Kernel panic - not syncing: Fatal exception in interrupt Note that bh_lock_sock() is not serializing the tasklet context against process context, because the check for sock_owned_by_user() and corresponding handling is missing. Ideas for a future clean-up patch: A) Correct usage of bh_lock_sock() in tasklet context, as described in Re-enqueue, if needed. This may require adding return values to the tasklet functions and thus changes to all users of iucv. B) Change iucv tasklet into worker and use only lock_sock() in af_iucv.
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 | — | 6.8.0-48.48 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 6.8.0-1018.20 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1072.78~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1135.145~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-6.8 | — | 6.8.0-1018.19~22.04.1 |
| linux-aws-fips | — | 5.15.0-1072.78+fips1 |
| linux-aws-hwe | — | 4.15.0-1174.187~16.04.1 |
| linux-azure | — | 6.8.0-1017.20 |
| linux-azure-4.15 | — | 4.15.0-1182.197 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1078.87~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1140.147~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | — |
| linux-azure-6.8 | — | 6.8.0-1017.20~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fips | — | 5.15.0-1075.84+fips1 |
| linux-bluefield | — | — |
| linux-fips | — | 6.8.0-78.78+fips1 |
| linux-gcp | — | 6.8.0-1017.19 |
| linux-gcp-4.15 | — | 4.15.0-1167.184 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1071.79~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1139.148~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | — |
| linux-gcp-6.8 | — | 6.8.0-1017.19~22.04.1 |
| linux-gcp-fips | — | 5.15.0-1071.79+fips1 |
| linux-gke | — | 6.8.0-1013.17 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 6.8.0-1002.4 |
| linux-gkeop-5.15 | — | 5.15.0-1055.62~20.04.1 |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-125.135~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-200.220~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | — |
| linux-hwe-6.8 | — | 6.8.0-48.48~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 6.8.0-1015.15 |
| linux-ibm-5.15 | — | 5.15.0-1065.68~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1082.87~18.04.1 |
| linux-ibm-6.8 | — | 6.8.0-1015.15~22.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1066.68 |
| linux-intel-iotg | — | 5.15.0-1067.73 |
| linux-intel-iotg-5.15 | — | 5.15.0-1067.73~20.04.1 |
| linux-iot | — | 5.4.0-1044.45 |
| linux-kvm | — | 5.15.0-1069.74 |
| linux-lowlatency | — | 6.8.0-48.48.3 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-125.135~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | — |
| linux-lowlatency-hwe-6.8 | — | 6.8.0-48.48.3~22.04.1 |
| linux-lts-xenial | — | 4.4.0-260.294~14.04.1 |
| linux-nvidia | — | 6.8.0-1017.19 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | — |
| linux-nvidia-6.8 | — | 6.8.0-1017.19~22.04.1 |
| linux-nvidia-lowlatency | — | 6.8.0-1017.19.1 |
| linux-nvidia-tegra | — | 5.15.0-1032.32 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1032.32~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1020.20 |
| 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-6.5 | — | — |
| linux-oem-6.8 | — | 6.8.0-1016.16 |
| linux-oracle | — | 6.8.0-1015.16 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1070.76~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1134.143~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | — |
| linux-oracle-6.8 | — | 6.8.0-1015.15~22.04.1 |
| linux-raspi | — | 6.8.0-1014.16 |
| linux-raspi-5.4 | — | 5.4.0-1119.131~18.04.1 |
| linux-raspi-realtime | — | 6.8.0-2013.14 |
| linux-raspi2 | — | — |
| linux-realtime | — | 6.8.1-1011.11 |
| linux-realtime-6.8 | — | 6.8.1-1011.11~22.04.1 |
| linux-riscv | — | 6.8.0-48.48.1 |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1068.72~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.5 | — | — |
| linux-riscv-6.8 | — | 6.8.0-48.48.1~22.04.2 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | — |
| linux-xilinx | — | 6.8.0-1009.10 |
| linux-xilinx-zynqmp | — | 5.15.0-1038.42 |
References
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