ghsa-p79g-j2j8-9wqw
Vulnerability from github
Published
2024-09-04 21:30
Modified
2024-10-03 15:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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.

Show details on source website

To clipboard 

{
   affected: [],
   aliases: [
      "CVE-2024-44973",
   ],
   database_specific: {
      cwe_ids: [],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-09-04T19:15:31Z",
      severity: "MODERATE",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nmm, slub: do not call do_slab_free for kfence object\n\nIn 782f8906f805 the freeing of kfence objects was moved from deep\ninside do_slab_free to the wrapper functions outside. This is a nice\nchange, but unfortunately it missed one spot in __kmem_cache_free_bulk.\n\nThis results in a crash like this:\n\nBUG skbuff_head_cache (Tainted: G S  B       E     ): Padding overwritten. 0xffff88907fea0f00-0xffff88907fea0fff @offset=3840\n\nslab_err (mm/slub.c:1129)\nfree_to_partial_list (mm/slub.c:? mm/slub.c:4036)\nslab_pad_check (mm/slub.c:864 mm/slub.c:1290)\ncheck_slab (mm/slub.c:?)\nfree_to_partial_list (mm/slub.c:3171 mm/slub.c:4036)\nkmem_cache_alloc_bulk (mm/slub.c:? mm/slub.c:4495 mm/slub.c:4586 mm/slub.c:4635)\nnapi_build_skb (net/core/skbuff.c:348 net/core/skbuff.c:527 net/core/skbuff.c:549)\n\nAll the other callers to do_slab_free appear to be ok.\n\nAdd a kfence_free check in __kmem_cache_free_bulk to avoid the crash.",
   id: "GHSA-p79g-j2j8-9wqw",
   modified: "2024-10-03T15:30:47Z",
   published: "2024-09-04T21:30:32Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-44973",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/a371d558e6f3aed977a8a7346350557de5d25190",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/b35cd7f1e969aaa63e6716d82480f6b8a3230949",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
         type: "CVSS_V3",
      },
   ],
}


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