# CVE-2024-44973: linux: In the Linux kernel, the following vulnerability has been resolved:  mm, slub: do not call do_slab_free for kfence ob...

CVE-2024-44973 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-44973, released September 4, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-44973
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0044
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm, slub: do not call do_slab_free for kfence object  In 782f8906f805 the freeing of kfence objects was moved from deep inside do_slab_free to the wrapper functions outside. This is a nice change, but unfortunately it missed one spot in __kmem_cache_free_bulk.  This results in a crash like this:  BUG skbuff_head_cache (Tainted: G S  B       E     ): Padding overwritten. 0xffff88907fea0f00-0xffff88907fea0fff @offset=3840  slab_err (mm/slub.c:1129) free_to_partial_list (mm/slub.c:? mm/slub.c:4036) slab_pad_check (mm/slub.c:864 mm/slub.c:1290) check_slab (mm/slub.c:?) free_to_partial_list (mm/slub.c:3171 mm/slub.c:4036) kmem_cache_alloc_bulk (mm/slub.c:? mm/slub.c:4495 mm/slub.c:4586 mm/slub.c:4635) napi_build_skb (net/core/skbuff.c:348 net/core/skbuff.c:527 net/core/skbuff.c:549)  All the other callers to do_slab_free appear to be ok.  Add a kfence_free check in __kmem_cache_free_bulk to avoid the crash.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.6-1 | [DEBIAN-CVE-2024-44973](https://patchblox.com/security/data/fix/linux/debian-cve-2024-44973.md) | Sep 4, 2024 |
| Linux | linux Debian 14 | 6.10.6-1 | [DEBIAN-CVE-2024-44973](https://patchblox.com/security/data/fix/linux/debian-cve-2024-44973.md) | Sep 4, 2024 |

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