CVE Catalog

CVE-2024-36916

High
Published: Translated: NVD NIST

Summary

A vulnerability has been identified in the Linux kernel within the blk-iocost module, leading to undefined behavior related to bit shifting. The issue occurs when the iocg->delay value is shifted right by a number that is too large, potentially causing errors on some architectures.

Risk Assessment

Undefined behavior may lead to system instability and potential crashes, jeopardizing the integrity and availability of services running on this kernel.

Recommendation

It is recommended to update the Linux kernel to a version that includes a fix addressing this undefined behavior by properly managing bit shifts.

Related vulnerabilities

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: blk-iocost: avoid out of bounds shift UBSAN catches undefined behavior in blk-iocost, where sometimes iocg->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:1366:23 shift 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 #1 Hardware name: Quanta Twin Lakes MP/Twin Lakes Passive MP, BIOS F09_3A23 12/08/2020 Call Trace: <IRQ> 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 undef

Vulnerability data from NVD (NIST) · CISA KEV · EPSS