CVE-2024-44973: mm, slub: do not call do_slab_free for kfence object
First published: Wed Sep 04 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.8<6.10.5 | |
| Linux Linux kernel | =6.11-rc1 | |
| Linux Linux kernel | =6.11-rc2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/a371d558e6f3aed977a8a7346350557de5d25190
- https://git.kernel.org/stable/c/b35cd7f1e969aaa63e6716d82480f6b8a3230949
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44973
- https://nvd.nist.gov/vuln/detail/CVE-2024-44973
- https://launchpad.net/bugs/cve/CVE-2024-44973
- https://security-tracker.debian.org/tracker/CVE-2024-44973
- https://ubuntu.com/security/CVE-2024-44973
- https://git.kernel.org/linus/a371d558e6f3aed977a8a7346350557de5d25190
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