In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: Fix use-after-free race condition for maps
It is possible that in between calling fastrpc_map_get() until map->fl->lock is taken in fastrpc_free_map(), another thread can call fastrpc_map_lookup() and get a reference to a map that is about to be deleted.
Rewrite fastrpc_map_get() to only increase the reference count of a map if it's non-zero. Propagate this to callers so they can know if a map is about to be deleted.
Fixes this warning: refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 10100 at lib/refcount.c:25 refcount_warn_saturate ... Call trace: refcount_warn_saturate [fastrpc_map_get inlined] [fastrpc_map_lookup inlined] fastrpc_map_create fastrpc_internal_invoke fastrpc_device_ioctl __arm64_sys_ioctl invoke_syscall
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Aug 22, 2024 | Aug 22, 2024 |
| Dell Powerstore Dsa2025086 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Feb 20, 2025 |
| Ubuntu | — | Upgrade linux-aws-fipsUpgrade linux-lowlatencyUpgrade linux-intel-iot-realtimeUpgrade linux-ibmUpgrade linux-hwe-5.4Upgrade linux-azure-fipsUpgrade linuxUpgrade linux-gcp-fipsUpgrade linux-xilinx-zynqmpUpgrade linux-gkeopUpgrade linux-azure-5.15Upgrade linux-oracle-5.15Upgrade linux-azure-5.4Upgrade linux-nvidiaUpgrade linux-gcpUpgrade linux-gcp-5.4Upgrade linux-oracleUpgrade linux-ibm-5.4Upgrade linux-raspiUpgrade linux-bluefieldUpgrade linux-iotUpgrade linux-oracle-5.4Upgrade linux-azure-fdeUpgrade linux-awsUpgrade linux-raspi-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-gkeop-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-aws-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-riscv-5.15Upgrade linux-azureUpgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-realtimeUpgrade linux-aws-5.15 | Nov 19, 2024 | Aug 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Aug 21, 2024 |
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