CVE-2024-53049: slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof
First published: Tue Nov 19 2024(Updated: )
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 ]---
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.11<6.11.7 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 | |
| Linux Kernel | =6.12-rc5 |
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Frequently Asked Questions
What is the severity of CVE-2024-53049?
CVE-2024-53049 is considered to be of low severity as it mainly triggers warnings related to memory allocation issues.
How do I fix CVE-2024-53049?
To fix CVE-2024-53049, update your Linux kernel to version 6.12 or later.
What software versions are affected by CVE-2024-53049?
CVE-2024-53049 affects the Linux kernel versions from 6.11 to 6.12-rc5.
Can CVE-2024-53049 lead to security breaches?
CVE-2024-53049 does not directly result in security breaches, as it primarily produces warnings during module loading.
What changes were made to address CVE-2024-53049?
The root cause of CVE-2024-53049 was addressed by fixing the improper use of the __kmalloc_cache_noprof function in the kernel.
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