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CVE-2024-36916

Description

In the Linux kernel, the following vulnerability has been resolved:blk-iocost: avoid out of bounds shiftUBSAN catches undefined behavior in blk-iocost, where sometimesiocg->delay is shifted right by a number that is too large,resulting in undefined behavior on some architectures.[ 186.556576] ------------[ cut here ]------------UBSAN: shift-out-of-bounds in block/blk-iocost.c:1366:23shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long')CPU: 16 PID: 0 Comm: swapper/16 Tainted: G S E N 6.9.0-0_fbk700_debug_rc2_kbuilder_0_gc85af715cac0 #1Hardware name: Quanta Twin Lakes MP/Twin Lakes Passive MP, BIOS F09_3A23 12/08/2020Call Trace: dump_stack_lvl+0x8f/0xe0 __ubsan_handle_shift_out_of_bounds+0x22c/0x280 iocg_kick_delay+0x30b/0x310 ioc_timer_fn+0x2fb/0x1f80 __run_timer_base+0x1b6/0x250...Avoid that undefined behavior by simply taking the"delay = 0" branch if the shift is too large.I am not sure what the symptoms of an undefined valuedelay will be, but I suspect it could be more than alittle annoying to debug.

POC

Reference

No PoCs from references.

Github

- https://github.com/fkie-cad/nvd-json-data-feeds