CVE-2023-53375

Technical Description

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

tracing: Free error logs of tracing instances

When a tracing instance is removed, the error messages that hold errors

that occurred in the instance needs to be freed. The following reports a

memory leak:

# cd /sys/kernel/tracing

# mkdir instances/foo

# echo 'hist:keys=x' > instances/foo/events/sched/sched_switch/trigger

# cat instances/foo/error_log

[ 117.404795] hist:sched:sched_switch: error: Couldn't find field

Command: hist:keys=x

^

# rmdir instances/foo

Then check for memory leaks:

# echo scan > /sys/kernel/debug/kmemleak

# cat /sys/kernel/debug/kmemleak

unreferenced object 0xffff88810d8ec700 (size 192):

comm "bash", pid 869, jiffies 4294950577 (age 215.752s)

hex dump (first 32 bytes):

60 dd 68 61 81 88 ff ff 60 dd 68 61 81 88 ff ff `.ha....`.ha....

a0 30 8c 83 ff ff ff ff 26 00 0a 00 00 00 00 00 .0......&.......

backtrace:

[<00000000dae26536>] kmalloc_tra

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References