Vulnerability CVE-2024-26894
Published: 2024-04-17

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

ACPI: processor_idle: Fix memory leak in acpi_processor_power_exit()

After unregistering the CPU idle device, the memory associated with
it is not freed, leading to a memory leak:

unreferenced object 0xffff896282f6c000 (size 1024):
comm "swapper/0", pid 1, jiffies 4294893170
hex dump (first 32 bytes):
00 00 00 00 0b 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 8836a742):
[<ffffffff993495ed>] kmalloc_trace+0x29d/0x340
[<ffffffff9972f3b3>] acpi_processor_power_init+0xf3/0x1c0
[<ffffffff9972d263>] __acpi_processor_start+0xd3/0xf0
[<ffffffff9972d2bc>] acpi_processor_start+0x2c/0x50
[<ffffffff99805872>] really_probe+0xe2/0x480
[<ffffffff99805c98>] __driver_probe_device+0x78/0x160
[<ffffffff99805daf>] driver_probe_device+0x1f/0x90
[<ffffffff9980601e>] __driver_attach+0xce/0x1c0
[<ffffffff99803170>] bus_for_each_dev+0x70/0xc0
[<ffffffff99804822>] bus_add_driver+0x112/0x210
[<ffffffff99807245>] driver_register+0x55/0x100
[<ffffffff9aee4acb>] acpi_processor_driver_init+0x3b/0xc0
[<ffffffff990012d1>] do_one_initcall+0x41/0x300
[<ffffffff9ae7c4b0>] kernel_init_freeable+0x320/0x470
[<ffffffff99b231f6>] kernel_init+0x16/0x1b0
[<ffffffff99042e6d>] ret_from_fork+0x2d/0x50

Fix this by freeing the CPU idle device after unregistering it.

 References:
https://git.kernel.org/stable/c/d351bcadab6caa6d8ce7159ff4b77e2da35c09fa
https://git.kernel.org/stable/c/ea96bf3f80625cddba1391a87613356b1b45716d
https://git.kernel.org/stable/c/c2a30c81bf3cb9033fa9f5305baf7c377075e2e5
https://git.kernel.org/stable/c/1cbaf4c793b0808532f4e7b40bc4be7cec2c78f2
https://git.kernel.org/stable/c/fad9bcd4d754cc689c19dc04d2c44b82c1a5d6c8
https://git.kernel.org/stable/c/3d48e5be107429ff5d824e7f2a00d1b610d36fbc
https://git.kernel.org/stable/c/8d14a4d0afb49a5b8535d414c782bb334860e73e
https://git.kernel.org/stable/c/cd5c2d0b09d5b6d3f0a7bbabe6761a4997e9dee9
https://git.kernel.org/stable/c/e18afcb7b2a12b635ac10081f943fcf84ddacc51
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