CVE-2024-53049 slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof
A null pointer dereference in the Linux kernel's SLUB allocator triggers a warning and potential crash when running specific KUnit tests.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-53049?
CVE-2024-53049 is a medium-severity vulnerability in Linux kernel, published on 19 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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_threadfn_adapter+0x2c/0x4c [kunit] [58162.959841] kthread+0x10c/0x118 [58162.960093] ret_from_fork+0x10/0x20 [58162.960363] ---[ end trace 0000000000000000 ]---
Which versions are affected by CVE-2024-53049?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-53049?
Apply the vendor's patch.
Is CVE-2024-53049 being exploited?
There is no known exploitation of CVE-2024-53049 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-53049, DEBIAN-CVE-2024-53049, GHSA-xxcq-q4px-9ggw, UBUNTU-CVE-2024-53049.