mm/slab_common: fix possible double free of kmem_cache

{
  "id": "44e8cd08833374d2b0efb6ce5672f0aec0f8a49f0d13645c6526497e27eb3fbc",
  "url": "https://osv.dev/vulnerability/CVE-2022-48649",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/slab_common: fix possible double free of kmem_cache",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/slab_common: fix possible double free of kmem_cache When doing slub_debug test, kfence's 'test_memcache_typesafe_by_rcu' kunit test case cause a use-after-free error: BUG: KASAN: use-after-free in kobject_del+0x14/0x30 Read of size 8 at addr ffff888007679090 by task kunit_try_catch/261 CPU: 1 PID: 261 Comm: kunit_try_catch Tainted: G B N 6.0.0-rc5-next-20220916 #17 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x34/0x48 print_address_description.constprop.0+0x87/0x2a5 print_report+0x103/0x1ed kasan_report+0xb7/0x140 kobject_del+0x14/0x30 kmem_cache_destroy+0x130/0x170 test_exit+0x1a/0x30 kunit_try_run_case+0xad/0xc0 kunit_generic_run_threadfn_adapter+0x26/0x50 kthread+0x17b/0x1b0 The cause is inside kmem_cache_destroy(): kmem_cache_destroy acquire lock/mutex shutdown_cache schedule_work(kmem_cache_release) (if RCU flag set) release lock/mutex kmem_cache_release (if RCU flag not set) In some certain timing, the scheduled work could be run before the next RCU flag checking, which can then get a wrong value and lead to double kmem_cache_release(). Fix it by caching the RCU flag inside protected area, just like 'refcnt'",
    "evidence": "osv:CVE-2022-48649",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.19.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-48649",
      "aliases": [
        "CVE-2022-48649"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "357321557920c805de2b14832002465c320eea4f"
                },
                {
                  "fixed": "c673c6ceac53fb2e631c9fbbd79957099a08927f"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0495e337b7039191dfce6e03f5f830454b1fae6b"
                },
                {
                  "fixed": "d71608a877362becdc94191f190902fac1e64d35"
                }
              ]
            }
          ],
          "versions": [
            "v5.19.11",
            "v5.19.10",
            "v5.19.9",
            "v5.19.8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48649.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.8"
                },
                {
                  "fixed": "5.19.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48649.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.240337676Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/c673c6ceac53fb2e631c9fbbd79957099a08927f",
        "https://git.kernel.org/stable/c/d71608a877362becdc94191f190902fac1e64d35",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48649.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-48649",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48649.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-48649",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507378,
  "published_at": "2024-04-28T13:00:33.39+00:00"
}