CVE-2024-53049

Technical Description

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

slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof

'modprobe slub_kunit' will have a warning as shown below. The root cause

is that __kmalloc_cache_noprof was directly used, which resulted in no

alloc_tag being allocated. This caused current->alloc_tag to be null,

leading to a warning in alloc_tag_add_check.

Let's add an alloc_hook layer to __kmalloc_cache_noprof specifically

within lib/slub_kunit.c, which is the only user of this internal slub

function outside kmalloc implementation itself.

[58162.947016] WARNING: CPU: 2 PID: 6210 at

./include/linux/alloc_tag.h:125 alloc_tagging_slab_alloc_hook+0x268/0x27c

[58162.957721] Call trace:

[58162.957919] alloc_tagging_slab_alloc_hook+0x268/0x27c

[58162.958286] __kmalloc_cache_noprof+0x14c/0x344

[58162.958615] test_kmalloc_redzone_access+0x50/0x10c [slub_kunit]

[58162.959045] kunit_try_run_case+0x74/0x184 [kunit]

[58162.959401] kunit_generic_run_thread

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