CVE-2024-26645

/// Technical description

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

tracing: Ensure visibility when inserting an element into tracing_map

Running the following two commands in parallel on a multi-processor

AArch64 machine can sporadically produce an unexpected warning about

duplicate histogram entries:

$ while true; do

echo hist:key=id.syscall:val=hitcount > \

/sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger

cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist

sleep 0.001

done

$ stress-ng --sysbadaddr $(nproc)

The warning looks as follows:

[ 2911.172474] ------------[ cut here ]------------

[ 2911.173111] Duplicates detected: 1

[ 2911.173574] WARNING: CPU: 2 PID: 12247 at kernel/trace/tracing_map.c:983 tracing_map_sort_entries+0x3e0/0x408

[ 2911.174702] Modules linked in: iscsi_ibft(E) iscsi_boot_sysfs(E) rfkill(E) af_packet(E) nls_iso8859_1(E) nls_cp437(E) vfat(E) fat(E) ena(E) tiny_power_button(E) qemu_fw_cfg(E) button(E) fus

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References