CVE-2024-41051 — cachefiles: wait for ondemand_object_worker to finish when dropping object

Affected: Linux

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

cachefiles: wait for ondemand_object_worker to finish when dropping object

When queuing ondemand_object_worker() to re-open the object, cachefiles_object is not pinned. The cachefiles_object may be freed when the pending read request is completed intentionally and the related erofs is umounted. If ondemand_object_worker() runs after the object is freed, it will incur use-after-free problem as shown below.

process A processs B process C process D

cachefiles_ondemand_send_req() // send a read req X // wait for its completion

// close ondemand fd cachefiles_ondemand_fd_release() // set object as CLOSE

cachefiles_ondemand_daemon_read() // set object as REOPENING queue_work(fscache_wq, &info->ondemand_work)

// close /dev/cachefiles cachefiles_daemon_release cachefiles_flush_reqs complete(&req->done)

// read req X is completed // umount the erofs fs cachefiles_put_object() // object will be freed cachefiles_ondemand_deinit_obj_info() kmem_cache_free(object) // both info and object are freed ondemand_object_worker()

When dropping an object, it is no longer necessary to reopen the object, so use cancel_work_sync() to cancel or wait f…

USN-7089-1 — linux, linux-gcp-6.8, linux-hwe-6.8 vulnerabilities

Affected: Ubuntu:22.04:LTS: linux-gcp-6.8, Ubuntu:22.04:LTS: linux-hwe-6.8, Ubuntu:24.04:LTS: linux

Chenyuan Yang discovered that the USB Gadget subsystem in the Linux kernel did not properly check for the device to be enabled before writing. A local attacker could possibly use this to cause a denial of service. (CVE-2024-25741)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM32 architecture; - MIPS architecture; - PA-RISC architecture; - PowerPC architecture; - RISC-V architecture; - S390 architecture; - x86 architecture; - Cryptographic API; - Serial ATA and Parallel ATA drivers; - Null block device driver; - Bluetooth drivers; - Cdrom driver; - Clock framework and drivers; - Hardware crypto device drivers; - CXL (Compute Express Link) drivers; - Cirrus firmware drivers; - GPIO subsystem; - GPU drivers; - I2C subsystem; - IIO subsystem; - InfiniBand drivers; - ISDN/mISDN subsystem; - LED subsystem; - Multiple devices driver; - Media drivers; - Fastrpc Driver; - Network drivers; - Microsoft Azure Network Adapter (MANA) driver; - Near Field Communication (NFC) drivers; - NVME drivers; - NVMEM (Non Volatile Memory) drivers; - PCI subsystem; - Pin controllers subsystem; - x86 platform drivers; - S/390 drivers; - SCSI drivers; - Thermal drivers; - TTY drivers; - UFS subsystem; - USB DSL drivers; - USB core drivers; - DesignWare USB3 driver; - USB Gadget dr…

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CVE-2024-41051 — cachefiles: wait for ondemand_object_worker to finish when dropping object

USN-7089-1 — linux, linux-gcp-6.8, linux-hwe-6.8 vulnerabilities